- 08 Oct, 2018 11 commits
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Ingo Molnar authored
So: - use 'extern' consistently for APIs - fix weird header guard - clarify code comments - reorder APIs by type Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Chang S. Bae <chang.seok.bae@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1537312139-5580-2-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Ingo Molnar authored
We have a special segment descriptor entry in the GDT, whose sole purpose is to encode the CPU and node numbers in its limit (size) field. There are user-space instructions that allow the reading of the limit field, which gives us a really fast way to read the CPU and node IDs from the vDSO for example. But the naming of related functionality does not make this clear, at all: VDSO_CPU_SIZE VDSO_CPU_MASK __CPU_NUMBER_SEG GDT_ENTRY_CPU_NUMBER vdso_encode_cpu_node vdso_read_cpu_node There's a number of problems: - The 'VDSO_CPU_SIZE' doesn't really make it clear that these are number of bits, nor does it make it clear which 'CPU' this refers to, i.e. that this is about a GDT entry whose limit encodes the CPU and node number. - Furthermore, the 'CPU_NUMBER' naming is actively misleading as well, because the segment limit encodes not just the CPU number but the node ID as well ... So use a better nomenclature all around: name everything related to this trick as 'CPUNODE', to make it clear that this is something special, and add _BITS to make it clear that these are number of bits, and propagate this to every affected name: VDSO_CPU_SIZE => VDSO_CPUNODE_BITS VDSO_CPU_MASK => VDSO_CPUNODE_MASK __CPU_NUMBER_SEG => __CPUNODE_SEG GDT_ENTRY_CPU_NUMBER => GDT_ENTRY_CPUNODE vdso_encode_cpu_node => vdso_encode_cpunode vdso_read_cpu_node => vdso_read_cpunode This, beyond being less confusing, also makes it easier to grep for all related functionality: $ git grep -i cpunode arch/x86 Also, while at it, fix "return is not a function" style sloppiness in vdso_encode_cpunode(). Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Chang S. Bae <chang.seok.bae@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1537312139-5580-2-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Chang S. Bae authored
Currently the CPU/node NR segment descriptor (GDT_ENTRY_CPU_NUMBER) is initialized relatively late during CPU init, from the vCPU code, which has a number of disadvantages, such as hotplug CPU notifiers and SMP cross-calls. Instead just initialize it much earlier, directly in cpu_init(). This reduces complexity and increases robustness. [ mingo: Wrote new changelog. ] Suggested-by: H. Peter Anvin <hpa@zytor.com> Suggested-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1537312139-5580-9-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Chang S. Bae authored
Clean up the CPU/node number related code a bit, to make it more apparent how we are encoding/extracting the CPU and node fields from the segment limit. No change in functionality intended. [ mingo: Wrote new changelog. ] Suggested-by: Andy Lutomirski <luto@kernel.org> Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Link: http://lkml.kernel.org/r/1537312139-5580-8-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Chang S. Bae authored
The old 'per CPU' naming was misleading: 64-bit kernels don't use this GDT entry for per CPU data, but to store the CPU (and node) ID. [ mingo: Wrote new changelog. ] Suggested-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Link: http://lkml.kernel.org/r/1537312139-5580-7-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Chang S. Bae authored
Instead of open coding the calls to load_seg_legacy(), introduce x86_fsgsbase_load() to load FS/GS segments. This makes it more explicit that this is part of FSGSBASE functionality, and the new helper can be updated when FSGSBASE instructions are enabled. [ mingo: Wrote new changelog. ] Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Link: http://lkml.kernel.org/r/1537312139-5580-6-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Chang S. Bae authored
Replace open-coded rdmsr()'s with their <asm/fsgsbase.h> API counterparts. No change in functionality intended. [ mingo: Wrote new changelog. ] Based-on-code-from: Andy Lutomirski <luto@kernel.org> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Link: http://lkml.kernel.org/r/1537312139-5580-5-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Chang S. Bae authored
Use the new FS/GS base helper functions in <asm/fsgsbase.h> in the platform specific ptrace implementation of the following APIs: PTRACE_ARCH_PRCTL, PTRACE_SETREG, PTRACE_GETREG, etc. The fsgsbase code is more abstracted out this way and the FS/GS-update mechanism will be easier to change this way. [ mingo: Wrote new changelog. ] Based-on-code-from: Andy Lutomirski <luto@kernel.org> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1537312139-5580-4-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Chang S. Bae authored
Introduce FS/GS base access functionality via <asm/fsgsbase.h>, not yet used by anything directly. Factor out task_seg_base() from x86/ptrace.c and rename it to x86_fsgsbase_read_task() to make it part of the new helpers. This will allow us to enhance FSGSBASE support and eventually enable the FSBASE/GSBASE instructions. An "inactive" GS base refers to a base saved at kernel entry and being part of an inactive, non-running/stopped user-task. (The typical ptrace model.) Here are the new functions: x86_fsbase_read_task() x86_gsbase_read_task() x86_fsbase_write_task() x86_gsbase_write_task() x86_fsbase_read_cpu() x86_fsbase_write_cpu() x86_gsbase_read_cpu_inactive() x86_gsbase_write_cpu_inactive() As an advantage of the unified namespace we can now see all FS/GSBASE API use in the kernel via the following 'git grep' pattern: $ git grep x86_.*sbase [ mingo: Wrote new changelog. ] Based-on-code-from: Andy Lutomirski <luto@kernel.org> Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1537312139-5580-3-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Andy Lutomirski authored
On 64-bit kernels ptrace can read the FS/GS base using the register access APIs (PTRACE_PEEKUSER, etc.) or PTRACE_ARCH_PRCTL. Make both of these mechanisms return the actual FS/GS base. This will improve debuggability by providing the correct information to ptracer such as GDB. [ chang: Rebased and revised patch description. ] [ mingo: Revised the changelog some more. ] Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Markus T Metzger <markus.t.metzger@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Shankar <ravi.v.shankar@intel.com> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1537312139-5580-2-git-send-email-chang.seok.bae@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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Ingo Molnar authored
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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- 07 Oct, 2018 6 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-miscGreg Kroah-Hartman authored
I wrote: "Char/Misc fixes for 4.19-rc7 Here are 8 small fixes for some char/misc driver issues Included here are: - fpga driver fixes - thunderbolt bugfixes - firmware core revert/fix - hv core fix - hv tool fix All of these have been in linux-next with no reported issues." * tag 'char-misc-4.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: thunderbolt: Initialize after IOMMUs thunderbolt: Do not handle ICM events after domain is stopped firmware: Always initialize the fw_priv list object docs: fpga: document fpga manager flags fpga: bridge: fix obvious function documentation error tools: hv: fcopy: set 'error' in case an unknown operation was requested fpga: do not access region struct after fpga_region_unregister Drivers: hv: vmbus: Use get/put_cpu() in vmbus_connect()
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/ttyGreg Kroah-Hartman authored
I wrote: "Serial driver fixes for 4.19-rc7 Here are 3 small serial driver fixes for 4.19-rc7 - 2 sh-sci bugfixes for reported issues - a revert of the PM handling for the 8250_dw code All of these have been in linux-next with no reported issues." * tag 'tty-4.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: Revert "serial: sh-sci: Allow for compressed SCIF address" Revert "serial: sh-sci: Remove SCIx_RZ_SCIFA_REGTYPE" Revert "serial: 8250_dw: Fix runtime PM handling"
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usbGreg Kroah-Hartman authored
I wrote: "USB fixes for 4.19-rc7 Here are some small USB fixes for 4.19-rc7 These include: - the usual xhci bugfixes for reported issues - some new serial driver device ids - bugfix for the option serial driver for some devices - bugfix for the cdc_acm driver that has been there for a long time. All of these have been in linux-next for a while with no reported issues." * tag 'usb-4.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: usb: xhci-mtk: resume USB3 roothub first xhci: Add missing CAS workaround for Intel Sunrise Point xHCI usb: cdc_acm: Do not leak URB buffers USB: serial: simple: add Motorola Tetra MTP6550 id USB: serial: option: add two-endpoints device-id flag USB: serial: option: improve Quectel EP06 detection
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git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linuxGreg Kroah-Hartman authored
Wolfram writes: "i2c for 4.19 I2C has three driver bugfixes and a fix for a typo for you." * 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: designware: Call i2c_dw_clk_rate() only when calculating timings i2c: i2c-scmi: fix for i2c_smbus_write_block_data i2c: i2c-isch: fix spelling mistake "unitialized" -> "uninitialized" i2c: i2c-qcom-geni: Properly handle DMA safe buffers
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiGreg Kroah-Hartman authored
James writes: "SCSI fixes on 20181006 Small fix for an unititialized mutex in the qedi driver." * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: scsi: qedi: Initialize the stats mutex lock
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https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxGreg Kroah-Hartman authored
Michael writes: "powerpc fixes for 4.19 #4 Four regression fixes. A fix for a change to lib/xz which broke our zImage loader when building with XZ compression. OK'ed by Herbert who merged the original patch. The recent fix we did to avoid patching __init text broke some 32-bit machines, fix that. Our show_user_instructions() could be tricked into printing kernel memory, add a check to avoid that. And a fix for a change to our NUMA initialisation logic, which causes crashes in some kdump configurations. Thanks to: Christophe Leroy, Hari Bathini, Jann Horn, Joel Stanley, Meelis Roos, Murilo Opsfelder Araujo, Srikar Dronamraju." * tag 'powerpc-4.19-4' of https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/numa: Skip onlining a offline node in kdump path powerpc: Don't print kernel instructions in show_user_instructions() powerpc/lib: fix book3s/32 boot failure due to code patching lib/xz: Put CRC32_POLY_LE in xz_private.h
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- 06 Oct, 2018 1 commit
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netGreg Kroah-Hartman authored
Dave writes: "Networking fixes: 1) Fix truncation of 32-bit right shift in bpf, from Jann Horn. 2) Fix memory leak in wireless wext compat, from Stefan Seyfried. 3) Use after free in cfg80211's reg_process_hint(), from Yu Zhao. 4) Need to cancel pending work when unbinding in smsc75xx otherwise we oops, also from Yu Zhao. 5) Don't allow enslaving a team device to itself, from Ido Schimmel. 6) Fix backwards compat with older userspace for rtnetlink FDB dumps. From Mauricio Faria. 7) Add validation of tc policy netlink attributes, from David Ahern. 8) Fix RCU locking in rawv6_send_hdrinc(), from Wei Wang." * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (26 commits) net: mvpp2: Extract the correct ethtype from the skb for tx csum offload ipv6: take rcu lock in rawv6_send_hdrinc() net: sched: Add policy validation for tc attributes rtnetlink: fix rtnl_fdb_dump() for ndmsg header yam: fix a missing-check bug net: bpfilter: Fix type cast and pointer warnings net: cxgb3_main: fix a missing-check bug bpf: 32-bit RSH verification must truncate input before the ALU op net: phy: phylink: fix SFP interface autodetection be2net: don't flip hw_features when VXLANs are added/deleted net/packet: fix packet drop as of virtio gso net: dsa: b53: Keep CPU port as tagged in all VLANs openvswitch: load NAT helper bnxt_en: get the reduced max_irqs by the ones used by RDMA bnxt_en: free hwrm resources, if driver probe fails. bnxt_en: Fix enables field in HWRM_QUEUE_COS2BW_CFG request bnxt_en: Fix VNIC reservations on the PF. team: Forbid enslaving team device to itself net/usb: cancel pending work when unbinding smsc75xx mlxsw: spectrum: Delete RIF when VLAN device is removed ...
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- 05 Oct, 2018 22 commits
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Greg Kroah-Hartman authored
* akpm: mm: madvise(MADV_DODUMP): allow hugetlbfs pages ocfs2: fix locking for res->tracking and dlm->tracking_list mm/vmscan.c: fix int overflow in callers of do_shrink_slab() mm/vmstat.c: skip NR_TLB_REMOTE_FLUSH* properly mm/vmstat.c: fix outdated vmstat_text proc: restrict kernel stack dumps to root mm/hugetlb: add mmap() encodings for 32MB and 512MB page sizes mm/migrate.c: split only transparent huge pages when allocation fails ipc/shm.c: use ERR_CAST() for shm_lock() error return mm/gup_benchmark: fix unsigned comparison to zero in __gup_benchmark_ioctl mm, thp: fix mlocking THP page with migration enabled ocfs2: fix crash in ocfs2_duplicate_clusters_by_page() hugetlb: take PMD sharing into account when flushing tlb/caches mm: migration: fix migration of huge PMD shared pages
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Daniel Black authored
Reproducer, assuming 2M of hugetlbfs available: Hugetlbfs mounted, size=2M and option user=testuser # mount | grep ^hugetlbfs hugetlbfs on /dev/hugepages type hugetlbfs (rw,pagesize=2M,user=dan) # sysctl vm.nr_hugepages=1 vm.nr_hugepages = 1 # grep Huge /proc/meminfo AnonHugePages: 0 kB ShmemHugePages: 0 kB HugePages_Total: 1 HugePages_Free: 1 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB Hugetlb: 2048 kB Code: #include <sys/mman.h> #include <stddef.h> #define SIZE 2*1024*1024 int main() { void *ptr; ptr = mmap(NULL, SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_HUGETLB | MAP_ANONYMOUS, -1, 0); madvise(ptr, SIZE, MADV_DONTDUMP); madvise(ptr, SIZE, MADV_DODUMP); } Compile and strace: mmap(NULL, 2097152, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB, -1, 0) = 0x7ff7c9200000 madvise(0x7ff7c9200000, 2097152, MADV_DONTDUMP) = 0 madvise(0x7ff7c9200000, 2097152, MADV_DODUMP) = -1 EINVAL (Invalid argument) hugetlbfs pages have VM_DONTEXPAND in the VmFlags driver pages based on author testing with analysis from Florian Weimer[1]. The inclusion of VM_DONTEXPAND into the VM_SPECIAL defination was a consequence of the large useage of VM_DONTEXPAND in device drivers. A consequence of [2] is that VM_DONTEXPAND marked pages are unable to be marked DODUMP. A user could quite legitimately madvise(MADV_DONTDUMP) their hugetlbfs memory for a while and later request that madvise(MADV_DODUMP) on the same memory. We correct this omission by allowing madvice(MADV_DODUMP) on hugetlbfs pages. [1] https://stackoverflow.com/questions/52548260/madvisedodump-on-the-same-ptr-size-as-a-successful-madvisedontdump-fails-wit [2] commit 0103bd16 ("mm: prepare VM_DONTDUMP for using in drivers") Link: http://lkml.kernel.org/r/20180930054629.29150-1-daniel@linux.ibm.com Link: https://lists.launchpad.net/maria-discuss/msg05245.html Fixes: 0103bd16 ("mm: prepare VM_DONTDUMP for using in drivers") Reported-by: Kenneth Penza <kpenza@gmail.com> Signed-off-by: Daniel Black <daniel@linux.ibm.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Konstantin Khlebnikov <khlebnikov@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ashish Samant authored
In dlm_init_lockres() we access and modify res->tracking and dlm->tracking_list without holding dlm->track_lock. This can cause list corruptions and can end up in kernel panic. Fix this by locking res->tracking and dlm->tracking_list with dlm->track_lock instead of dlm->spinlock. Link: http://lkml.kernel.org/r/1529951192-4686-1-git-send-email-ashish.samant@oracle.comSigned-off-by: Ashish Samant <ashish.samant@oracle.com> Reviewed-by: Changwei Ge <ge.changwei@h3c.com> Acked-by: Joseph Qi <jiangqi903@gmail.com> Acked-by: Jun Piao <piaojun@huawei.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Changwei Ge <ge.changwei@h3c.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Kirill Tkhai authored
do_shrink_slab() returns unsigned long value, and the placing into int variable cuts high bytes off. Then we compare ret and 0xfffffffe (since SHRINK_EMPTY is converted to ret type). Thus a large number of objects returned by do_shrink_slab() may be interpreted as SHRINK_EMPTY, if low bytes of their value are equal to 0xfffffffe. Fix that by declaration ret as unsigned long in these functions. Link: http://lkml.kernel.org/r/153813407177.17544.14888305435570723973.stgit@localhost.localdomainSigned-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Reported-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Reviewed-by: Josef Bacik <josef@toxicpanda.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Shakeel Butt <shakeelb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Jann Horn authored
5dd0b16c ("mm/vmstat: Make NR_TLB_REMOTE_FLUSH_RECEIVED available even on UP") made the availability of the NR_TLB_REMOTE_FLUSH* counters inside the kernel unconditional to reduce #ifdef soup, but (either to avoid showing dummy zero counters to userspace, or because that code was missed) didn't update the vmstat_array, meaning that all following counters would be shown with incorrect values. This only affects kernel builds with CONFIG_VM_EVENT_COUNTERS=y && CONFIG_DEBUG_TLBFLUSH=y && CONFIG_SMP=n. Link: http://lkml.kernel.org/r/20181001143138.95119-2-jannh@google.com Fixes: 5dd0b16c ("mm/vmstat: Make NR_TLB_REMOTE_FLUSH_RECEIVED available even on UP") Signed-off-by: Jann Horn <jannh@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Roman Gushchin <guro@fb.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: Kemi Wang <kemi.wang@intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Jann Horn authored
7a9cdebd ("mm: get rid of vmacache_flush_all() entirely") removed the VMACACHE_FULL_FLUSHES statistics, but didn't remove the corresponding entry in vmstat_text. This causes an out-of-bounds access in vmstat_show(). Luckily this only affects kernels with CONFIG_DEBUG_VM_VMACACHE=y, which is probably very rare. Link: http://lkml.kernel.org/r/20181001143138.95119-1-jannh@google.com Fixes: 7a9cdebd ("mm: get rid of vmacache_flush_all() entirely") Signed-off-by: Jann Horn <jannh@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Roman Gushchin <guro@fb.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: Kemi Wang <kemi.wang@intel.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Jann Horn authored
Currently, you can use /proc/self/task/*/stack to cause a stack walk on a task you control while it is running on another CPU. That means that the stack can change under the stack walker. The stack walker does have guards against going completely off the rails and into random kernel memory, but it can interpret random data from your kernel stack as instruction pointers and stack pointers. This can cause exposure of kernel stack contents to userspace. Restrict the ability to inspect kernel stacks of arbitrary tasks to root in order to prevent a local attacker from exploiting racy stack unwinding to leak kernel task stack contents. See the added comment for a longer rationale. There don't seem to be any users of this userspace API that can't gracefully bail out if reading from the file fails. Therefore, I believe that this change is unlikely to break things. In the case that this patch does end up needing a revert, the next-best solution might be to fake a single-entry stack based on wchan. Link: http://lkml.kernel.org/r/20180927153316.200286-1-jannh@google.com Fixes: 2ec220e2 ("proc: add /proc/*/stack") Signed-off-by: Jann Horn <jannh@google.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Ken Chen <kenchen@google.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H . Peter Anvin" <hpa@zytor.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Anshuman Khandual authored
ARM64 architecture also supports 32MB and 512MB HugeTLB page sizes. This just adds mmap() system call argument encoding for them. Link: http://lkml.kernel.org/r/1537841300-6979-1-git-send-email-anshuman.khandual@arm.comSigned-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Punit Agrawal <punit.agrawal@arm.com> Acked-by: Mike Kravetz <mike.kravetz@oracle.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Will Deacon <will.deacon@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Anshuman Khandual authored
split_huge_page_to_list() fails on HugeTLB pages. I was experimenting with moving 32MB contig HugeTLB pages on arm64 (with a debug patch applied) and hit the following stack trace when the kernel crashed. [ 3732.462797] Call trace: [ 3732.462835] split_huge_page_to_list+0x3b0/0x858 [ 3732.462913] migrate_pages+0x728/0xc20 [ 3732.462999] soft_offline_page+0x448/0x8b0 [ 3732.463097] __arm64_sys_madvise+0x724/0x850 [ 3732.463197] el0_svc_handler+0x74/0x110 [ 3732.463297] el0_svc+0x8/0xc [ 3732.463347] Code: d1000400 f90b0e60 f2fbd5a2 a94982a1 (f9000420) When unmap_and_move[_huge_page]() fails due to lack of memory, the splitting should happen only for transparent huge pages not for HugeTLB pages. PageTransHuge() returns true for both THP and HugeTLB pages. Hence the conditonal check should test PagesHuge() flag to make sure that given pages is not a HugeTLB one. Link: http://lkml.kernel.org/r/1537798495-4996-1-git-send-email-anshuman.khandual@arm.com Fixes: 94723aaf ("mm: unclutter THP migration") Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Zi Yan <zi.yan@cs.rutgers.edu> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Kees Cook authored
This uses ERR_CAST() instead of an open-coded cast, as it is casting across structure pointers, which upsets __randomize_layout: ipc/shm.c: In function `shm_lock': ipc/shm.c:209:9: note: randstruct: casting between randomized structure pointer types (ssa): `struct shmid_kernel' and `struct kern_ipc_perm' return (void *)ipcp; ^~~~~~~~~~~~ Link: http://lkml.kernel.org/r/20180919180722.GA15073@beast Fixes: 82061c57 ("ipc: drop ipc_lock()") Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Manfred Spraul <manfred@colorfullife.com> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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YueHaibing authored
get_user_pages_fast() will return negative value if no pages were pinned, then be converted to a unsigned, which is compared to zero, giving the wrong result. Link: http://lkml.kernel.org/r/20180921095015.26088-1-yuehaibing@huawei.com Fixes: 09e35a4a ("mm/gup_benchmark: handle gup failures") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Kirill A. Shutemov authored
A transparent huge page is represented by a single entry on an LRU list. Therefore, we can only make unevictable an entire compound page, not individual subpages. If a user tries to mlock() part of a huge page, we want the rest of the page to be reclaimable. We handle this by keeping PTE-mapped huge pages on normal LRU lists: the PMD on border of VM_LOCKED VMA will be split into PTE table. Introduction of THP migration breaks[1] the rules around mlocking THP pages. If we had a single PMD mapping of the page in mlocked VMA, the page will get mlocked, regardless of PTE mappings of the page. For tmpfs/shmem it's easy to fix by checking PageDoubleMap() in remove_migration_pmd(). Anon THP pages can only be shared between processes via fork(). Mlocked page can only be shared if parent mlocked it before forking, otherwise CoW will be triggered on mlock(). For Anon-THP, we can fix the issue by munlocking the page on removing PTE migration entry for the page. PTEs for the page will always come after mlocked PMD: rmap walks VMAs from oldest to newest. Test-case: #include <unistd.h> #include <sys/mman.h> #include <sys/wait.h> #include <linux/mempolicy.h> #include <numaif.h> int main(void) { unsigned long nodemask = 4; void *addr; addr = mmap((void *)0x20000000UL, 2UL << 20, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_LOCKED, -1, 0); if (fork()) { wait(NULL); return 0; } mlock(addr, 4UL << 10); mbind(addr, 2UL << 20, MPOL_PREFERRED | MPOL_F_RELATIVE_NODES, &nodemask, 4, MPOL_MF_MOVE); return 0; } [1] https://lkml.kernel.org/r/CAOMGZ=G52R-30rZvhGxEbkTw7rLLwBGadVYeo--iizcD3upL3A@mail.gmail.com Link: http://lkml.kernel.org/r/20180917133816.43995-1-kirill.shutemov@linux.intel.com Fixes: 616b8371 ("mm: thp: enable thp migration in generic path") Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Vegard Nossum <vegard.nossum@oracle.com> Reviewed-by: Zi Yan <zi.yan@cs.rutgers.edu> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: <stable@vger.kernel.org> [4.14+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Larry Chen authored
ocfs2_duplicate_clusters_by_page() may crash if one of the extent's pages is dirty. When a page has not been written back, it is still in dirty state. If ocfs2_duplicate_clusters_by_page() is called against the dirty page, the crash happens. To fix this bug, we can just unlock the page and wait until the page until its not dirty. The following is the backtrace: kernel BUG at /root/code/ocfs2/refcounttree.c:2961! [exception RIP: ocfs2_duplicate_clusters_by_page+822] __ocfs2_move_extent+0x80/0x450 [ocfs2] ? __ocfs2_claim_clusters+0x130/0x250 [ocfs2] ocfs2_defrag_extent+0x5b8/0x5e0 [ocfs2] __ocfs2_move_extents_range+0x2a4/0x470 [ocfs2] ocfs2_move_extents+0x180/0x3b0 [ocfs2] ? ocfs2_wait_for_recovery+0x13/0x70 [ocfs2] ocfs2_ioctl_move_extents+0x133/0x2d0 [ocfs2] ocfs2_ioctl+0x253/0x640 [ocfs2] do_vfs_ioctl+0x90/0x5f0 SyS_ioctl+0x74/0x80 do_syscall_64+0x74/0x140 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Once we find the page is dirty, we do not wait until it's clean, rather we use write_one_page() to write it back Link: http://lkml.kernel.org/r/20180829074740.9438-1-lchen@suse.com [lchen@suse.com: update comments] Link: http://lkml.kernel.org/r/20180830075041.14879-1-lchen@suse.com [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Larry Chen <lchen@suse.com> Acked-by: Changwei Ge <ge.changwei@h3c.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <jiangqi903@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Mike Kravetz authored
When fixing an issue with PMD sharing and migration, it was discovered via code inspection that other callers of huge_pmd_unshare potentially have an issue with cache and tlb flushing. Use the routine adjust_range_if_pmd_sharing_possible() to calculate worst case ranges for mmu notifiers. Ensure that this range is flushed if huge_pmd_unshare succeeds and unmaps a PUD_SUZE area. Link: http://lkml.kernel.org/r/20180823205917.16297-3-mike.kravetz@oracle.comSigned-off-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Mike Kravetz authored
The page migration code employs try_to_unmap() to try and unmap the source page. This is accomplished by using rmap_walk to find all vmas where the page is mapped. This search stops when page mapcount is zero. For shared PMD huge pages, the page map count is always 1 no matter the number of mappings. Shared mappings are tracked via the reference count of the PMD page. Therefore, try_to_unmap stops prematurely and does not completely unmap all mappings of the source page. This problem can result is data corruption as writes to the original source page can happen after contents of the page are copied to the target page. Hence, data is lost. This problem was originally seen as DB corruption of shared global areas after a huge page was soft offlined due to ECC memory errors. DB developers noticed they could reproduce the issue by (hotplug) offlining memory used to back huge pages. A simple testcase can reproduce the problem by creating a shared PMD mapping (note that this must be at least PUD_SIZE in size and PUD_SIZE aligned (1GB on x86)), and using migrate_pages() to migrate process pages between nodes while continually writing to the huge pages being migrated. To fix, have the try_to_unmap_one routine check for huge PMD sharing by calling huge_pmd_unshare for hugetlbfs huge pages. If it is a shared mapping it will be 'unshared' which removes the page table entry and drops the reference on the PMD page. After this, flush caches and TLB. mmu notifiers are called before locking page tables, but we can not be sure of PMD sharing until page tables are locked. Therefore, check for the possibility of PMD sharing before locking so that notifiers can prepare for the worst possible case. Link: http://lkml.kernel.org/r/20180823205917.16297-2-mike.kravetz@oracle.com [mike.kravetz@oracle.com: make _range_in_vma() a static inline] Link: http://lkml.kernel.org/r/6063f215-a5c8-2f0c-465a-2c515ddc952d@oracle.com Fixes: 39dde65c ("shared page table for hugetlb page") Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/helgaas/pciGreg Kroah-Hartman authored
Bjorn writes: "PCI fixes for v4.19: - Reprogram bridge prefetch registers to fix NVIDIA and Radeon issues after suspend/resume (Daniel Drake) - Fix mvebu I/O mapping creation sequence (Thomas Petazzoni) - Fix minor MAINTAINERS file match issue (Bjorn Helgaas)" * tag 'pci-v4.19-fixes-3' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: PCI: mvebu: Fix PCI I/O mapping creation sequence MAINTAINERS: Remove obsolete drivers/pci pattern from ACPI section PCI: Reprogram bridge prefetch registers on resume
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Greg Kroah-Hartman authored
Merge tag 'for-4.19/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm Mike writes: "device mapper fixes - Fix a DM thinp __udivdi3 undefined on 32-bit bug introduced during 4.19 merge window. - Fix leak and dangling pointer in DM multipath's scsi_dh related code. - A couple stable@ fixes for DM cache's resize support. - A DM raid fix to remove "const" from decipher_sync_action()'s return type." * tag 'for-4.19/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: dm cache: fix resize crash if user doesn't reload cache table dm cache metadata: ignore hints array being too small during resize dm raid: remove bogus const from decipher_sync_action() return type dm mpath: fix attached_handler_name leak and dangling hw_handler_name pointer dm thin metadata: fix __udivdi3 undefined on 32-bit
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git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpioGreg Kroah-Hartman authored
Linus writes: "A single GPIO fix: Free the last used descriptor, an off by one error. This is tagged for stable as well." * tag 'gpio-v4.19-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: gpiolib: Free the last requested descriptor
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmGreg Kroah-Hartman authored
Rafael writes: "Power management fix for 4.19-rc7 Fix a bug that may cause runtime PM to misbehave for some devices after a failing or aborted system suspend which is nasty enough for an -rc7 time frame fix." * tag 'pm-4.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: PM / core: Clear the direct_complete flag on errors
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipGreg Kroah-Hartman authored
Ingo writes: "perf fixes: - fix a CPU#0 hot unplug bug and a PCI enumeration bug in the x86 Intel uncore PMU driver - fix a CPU event enumeration bug in the x86 AMD PMU driver - fix a perf ring-buffer corruption bug when using tracepoints - fix a PMU unregister locking bug" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86/amd/uncore: Set ThreadMask and SliceMask for L3 Cache perf events perf/x86/intel/uncore: Fix PCI BDF address of M3UPI on SKX perf/ring_buffer: Prevent concurent ring buffer access perf/x86/intel/uncore: Use boot_cpu_data.phys_proc_id instead of hardcorded physical package ID 0 perf/core: Fix perf_pmu_unregister() locking
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipGreg Kroah-Hartman authored
Ingo writes: "x86 fixes: Misc fixes: - fix various vDSO bugs: asm constraints and retpolines - add vDSO test units to make sure they never re-appear - fix UV platform TSC initialization bug - fix build warning on Clang" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/vdso: Fix vDSO syscall fallback asm constraint regression x86/cpu/amd: Remove unnecessary parentheses x86/vdso: Only enable vDSO retpolines when enabled and supported x86/tsc: Fix UV TSC initialization x86/platform/uv: Provide is_early_uv_system() selftests/x86: Add clock_gettime() tests to test_vdso x86/vdso: Fix asm constraints on vDSO syscall fallbacks
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipGreg Kroah-Hartman authored
Ingo writes: "scheduler fixes: These fixes address a rather involved performance regression between v4.17->v4.19 in the sched/numa auto-balancing code. Since distros really need this fix we accelerated it to sched/urgent for a faster upstream merge. NUMA scheduling and balancing performance is now largely back to v4.17 levels, without reintroducing the NUMA placement bugs that v4.18 and v4.19 fixed. Many thanks to Srikar Dronamraju, Mel Gorman and Jirka Hladky, for reporting, testing, re-testing and solving this rather complex set of bugs." * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/numa: Migrate pages to local nodes quicker early in the lifetime of a task mm, sched/numa: Remove rate-limiting of automatic NUMA balancing migration sched/numa: Avoid task migration for small NUMA improvement mm/migrate: Use spin_trylock() while resetting rate limit sched/numa: Limit the conditions where scan period is reset sched/numa: Reset scan rate whenever task moves across nodes sched/numa: Pass destination CPU as a parameter to migrate_task_rq sched/numa: Stop multiple tasks from moving to the CPU at the same time
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