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  1. 12 May, 2022 1 commit
    • Mao Bibo's avatar
      MIPS: smp: optimization for flush_tlb_mm when exiting · 84595f45
      Mao Bibo authored 
      When process exits or execute new binary, it will call function
exit_mmap with old mm, there is such function call trace:
  exit_mmap(struct mm_struct *mm)
      --> tlb_finish_mmu(&tlb, 0, -1)
         --> arch_tlb_finish_mmu(tlb, start, end, force)
	    --> tlb_flush_mmu(tlb);
               --> tlb_flush(struct mmu_gather *tlb)
                  --> flush_tlb_mm(tlb->mm)

It is not necessary to flush tlb since oldmm is not used anymore
by the process, there is similar operations on IA64/ARM64 etc,
this patch adds such optimization on MIPS.
Signed-off-by: default avatarMao Bibo <maobibo@loongson.cn>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
      84595f45
  3. 04 May, 2022 5 commits
  5. 27 Apr, 2022 7 commits
  7. 26 Apr, 2022 6 commits
  9. 17 Apr, 2022 10 commits
  11. 16 Apr, 2022 6 commits
    • Linus Torvalds's avatar
      Merge tag 'soc-fixes-5.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc · 70a0cec8
      Linus Torvalds authored 
      Pull ARM SoC fixes from Arnd Bergmann:
 "There are a number of SoC bugfixes that came in since the merge
  window, and more of them are already pending.

  This batch includes:

   - A boot time regression fix for davinci that triggered on
     multi_v5_defconfig when booting any platform

   - Defconfig updates to address removed features, changed symbol names
     or dependencies, for gemini, ux500, and pxa

   - Email address changes for Krzysztof Kozlowski

   - Build warning fixes for ep93xx and iop32x

   - Devicetree warning fixes across many platforms

   - Minor bugfixes for the reset controller, memory controller and SCMI
     firmware subsystems plus the versatile-express board"

* tag 'soc-fixes-5.18-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (34 commits)
  ARM: config: Update Gemini defconfig
  arm64: dts: qcom/sdm845-shift-axolotl: Fix boolean properties with values
  ARM: dts: align SPI NOR node name with dtschema
  ARM: dts: Fix more boolean properties with values
  arm/arm64: dts: qcom: Fix boolean properties with values
  arm64: dts: imx: Fix imx8*-var-som touchscreen property sizes
  arm: dts: imx: Fix boolean properties with values
  arm64: dts: tegra: Fix boolean properties with values
  arm: dts: at91: Fix boolean properties with values
  arm: configs: imote2: Drop defconfig as board support dropped.
  ep93xx: clock: Don't use plain integer as NULL pointer
  ep93xx: clock: Fix UAF in ep93xx_clk_register_gate()
  ARM: vexpress/spc: Fix all the kernel-doc build warnings
  ARM: vexpress/spc: Fix kernel-doc build warning for ve_spc_cpu_in_wfi
  ARM: config: u8500: Re-enable AB8500 battery charging
  ARM: config: u8500: Add some common hardware
  memory: fsl_ifc: populate child nodes of buses and mfd devices
  ARM: config: Refresh U8500 defconfig
  firmware: arm_scmi: Fix sparse warnings in OPTEE transport driver
  firmware: arm_scmi: Replace zero-length array with flexible-array member
  ...
      70a0cec8
    • Linus Torvalds's avatar
      Merge tag 'random-5.18-rc3-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random · 92edbe32
      Linus Torvalds authored 
      Pull random number generator fixes from Jason Donenfeld:

 - Per your suggestion, random reads now won't fail if there's a page
   fault after some non-zero amount of data has been read, which makes
   the behavior consistent with all other reads in the kernel.

 - Rather than an inconsistent mix of random_get_entropy() returning an
   unsigned long or a cycles_t, now it just returns an unsigned long.

 - A memcpy() was replaced with an memmove(), because the addresses are
   sometimes overlapping. In practice the destination is always before
   the source, so not really an issue, but better to be correct than
   not.

* tag 'random-5.18-rc3-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/crng/random:
  random: use memmove instead of memcpy for remaining 32 bytes
  random: make random_get_entropy() return an unsigned long
  random: allow partial reads if later user copies fail
      92edbe32
    • Linus Torvalds's avatar
      Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · 90ea17a9
      Linus Torvalds authored 
      Pull SCSI fixes from James Bottomley:
 "13 fixes, all in drivers.

  The most extensive changes are in the iscsi series (affecting drivers
  qedi, cxgbi and bnx2i), the next most is scsi_debug, but that's just a
  simple revert and then minor updates to pm80xx"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: iscsi: MAINTAINERS: Add Mike Christie as co-maintainer
  scsi: qedi: Fix failed disconnect handling
  scsi: iscsi: Fix NOP handling during conn recovery
  scsi: iscsi: Merge suspend fields
  scsi: iscsi: Fix unbound endpoint error handling
  scsi: iscsi: Fix conn cleanup and stop race during iscsid restart
  scsi: iscsi: Fix endpoint reuse regression
  scsi: iscsi: Release endpoint ID when its freed
  scsi: iscsi: Fix offload conn cleanup when iscsid restarts
  scsi: iscsi: Move iscsi_ep_disconnect()
  scsi: pm80xx: Enable upper inbound, outbound queues
  scsi: pm80xx: Mask and unmask upper interrupt vectors 32-63
  Revert "scsi: scsi_debug: Address races following module load"
      90ea17a9
    • Bartosz Golaszewski's avatar
      Merge tag 'intel-gpio-v5.18-2' of... · 0ebb4fbe
      Bartosz Golaszewski authored 
      Merge tag 'intel-gpio-v5.18-2' of gitolite.kernel.org:pub/scm/linux/kernel/git/andy/linux-gpio-intel into gpio/for-current

intel-gpio for v5.18-2

* Couple of fixes related to handling unsigned value of the pin from ACPI

gpiolib:
 -  acpi: Convert type for pin to be unsigned
 -  acpi: use correct format characters
      0ebb4fbe
    • Linus Torvalds's avatar
      Merge tag 'dma-mapping-5.18-2' of git://git.infradead.org/users/hch/dma-mapping · b0086839
      Linus Torvalds authored 
      Pull dma-mapping fix from Christoph Hellwig:

 - avoid a double memory copy for swiotlb (Chao Gao)

* tag 'dma-mapping-5.18-2' of git://git.infradead.org/users/hch/dma-mapping:
  dma-direct: avoid redundant memory sync for swiotlb
      b0086839
    • Jason A. Donenfeld's avatar
      random: use memmove instead of memcpy for remaining 32 bytes · 35a33ff3
      Jason A. Donenfeld authored 
      In order to immediately overwrite the old key on the stack, before
servicing a userspace request for bytes, we use the remaining 32 bytes
of block 0 as the key. This means moving indices 8,9,a,b,c,d,e,f ->
4,5,6,7,8,9,a,b. Since 4 < 8, for the kernel implementations of
memcpy(), this doesn't actually appear to be a problem in practice. But
relying on that characteristic seems a bit brittle. So let's change that
to a proper memmove(), which is the by-the-books way of handling
overlapping memory copies.
Reviewed-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: default avatarJason A. Donenfeld <Jason@zx2c4.com>
      35a33ff3
  13. 15 Apr, 2022 5 commits
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · 59250f8a
      Linus Torvalds authored 
      Merge misc fixes from Andrew Morton:
 "14 patches.

  Subsystems affected by this patch series: MAINTAINERS, binfmt, and
  mm (tmpfs, secretmem, kasan, kfence, pagealloc, zram, compaction,
  hugetlb, vmalloc, and kmemleak)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm: kmemleak: take a full lowmem check in kmemleak_*_phys()
  mm/vmalloc: fix spinning drain_vmap_work after reading from /proc/vmcore
  revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE"
  revert "fs/binfmt_elf: fix PT_LOAD p_align values for loaders"
  hugetlb: do not demote poisoned hugetlb pages
  mm: compaction: fix compiler warning when CONFIG_COMPACTION=n
  mm: fix unexpected zeroed page mapping with zram swap
  mm, page_alloc: fix build_zonerefs_node()
  mm, kfence: support kmem_dump_obj() for KFENCE objects
  kasan: fix hw tags enablement when KUNIT tests are disabled
  irq_work: use kasan_record_aux_stack_noalloc() record callstack
  mm/secretmem: fix panic when growing a memfd_secret
  tmpfs: fix regressions from wider use of ZERO_PAGE
  MAINTAINERS: Broadcom internal lists aren't maintainers
      59250f8a
    • Linus Torvalds's avatar
      Merge tag 'for-5.18/dm-fixes-2' of... · ce673f63
      Linus Torvalds authored 
      Merge tag 'for-5.18/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Fix memory corruption in DM integrity target when tag_size is less
   than digest size.

 - Fix DM multipath's historical-service-time path selector to not use
   sched_clock() and ktime_get_ns(); only use ktime_get_ns().

 - Fix dm_io->orig_bio NULL pointer dereference in dm_zone_map_bio() due
   to 5.18 changes that overlooked DM zone's use of ->orig_bio

 - Fix for regression that broke the use of dm_accept_partial_bio() for
   "abnormal" IO (e.g. WRITE ZEROES) that does not need duplicate bios

 - Fix DM's issuing of empty flush bio so that it's size is 0.

* tag 'for-5.18/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: fix bio length of empty flush
  dm: allow dm_accept_partial_bio() for dm_io without duplicate bios
  dm zone: fix NULL pointer dereference in dm_zone_map_bio
  dm mpath: only use ktime_get_ns() in historical selector
  dm integrity: fix memory corruption when tag_size is less than digest size
      ce673f63
    • Patrick Wang's avatar
      mm: kmemleak: take a full lowmem check in kmemleak_*_phys() · 23c2d497
      Patrick Wang authored 
      The kmemleak_*_phys() apis do not check the address for lowmem's min
boundary, while the caller may pass an address below lowmem, which will
trigger an oops:

  # echo scan > /sys/kernel/debug/kmemleak
  Unable to handle kernel paging request at virtual address ff5fffffffe00000
  Oops [#1]
  Modules linked in:
  CPU: 2 PID: 134 Comm: bash Not tainted 5.18.0-rc1-next-20220407 #33
  Hardware name: riscv-virtio,qemu (DT)
  epc : scan_block+0x74/0x15c
   ra : scan_block+0x72/0x15c
  epc : ffffffff801e5806 ra : ffffffff801e5804 sp : ff200000104abc30
   gp : ffffffff815cd4e8 tp : ff60000004cfa340 t0 : 0000000000000200
   t1 : 00aaaaaac23954cc t2 : 00000000000003ff s0 : ff200000104abc90
   s1 : ffffffff81b0ff28 a0 : 0000000000000000 a1 : ff5fffffffe01000
   a2 : ffffffff81b0ff28 a3 : 0000000000000002 a4 : 0000000000000001
   a5 : 0000000000000000 a6 : ff200000104abd7c a7 : 0000000000000005
   s2 : ff5fffffffe00ff9 s3 : ffffffff815cd998 s4 : ffffffff815d0e90
   s5 : ffffffff81b0ff28 s6 : 0000000000000020 s7 : ffffffff815d0eb0
   s8 : ffffffffffffffff s9 : ff5fffffffe00000 s10: ff5fffffffe01000
   s11: 0000000000000022 t3 : 00ffffffaa17db4c t4 : 000000000000000f
   t5 : 0000000000000001 t6 : 0000000000000000
  status: 0000000000000100 badaddr: ff5fffffffe00000 cause: 000000000000000d
    scan_gray_list+0x12e/0x1a6
    kmemleak_scan+0x2aa/0x57e
    kmemleak_write+0x32a/0x40c
    full_proxy_write+0x56/0x82
    vfs_write+0xa6/0x2a6
    ksys_write+0x6c/0xe2
    sys_write+0x22/0x2a
    ret_from_syscall+0x0/0x2

The callers may not quite know the actual address they pass(e.g. from
devicetree).  So the kmemleak_*_phys() apis should guarantee the address
they finally use is in lowmem range, so check the address for lowmem's
min boundary.

Link: https://lkml.kernel.org/r/20220413122925.33856-1-patrick.wang.shcn@gmail.comSigned-off-by: default avatarPatrick Wang <patrick.wang.shcn@gmail.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      23c2d497
    • Omar Sandoval's avatar
      mm/vmalloc: fix spinning drain_vmap_work after reading from /proc/vmcore · c12cd77c
      Omar Sandoval authored 
      Commit 3ee48b6a ("mm, x86: Saving vmcore with non-lazy freeing of
vmas") introduced set_iounmap_nonlazy(), which sets vmap_lazy_nr to
lazy_max_pages() + 1, ensuring that any future vunmaps() immediately
purge the vmap areas instead of doing it lazily.

Commit 690467c8 ("mm/vmalloc: Move draining areas out of caller
context") moved the purging from the vunmap() caller to a worker thread.
Unfortunately, set_iounmap_nonlazy() can cause the worker thread to spin
(possibly forever).  For example, consider the following scenario:

 1. Thread reads from /proc/vmcore. This eventually calls
    __copy_oldmem_page() -> set_iounmap_nonlazy(), which sets
    vmap_lazy_nr to lazy_max_pages() + 1.

 2. Then it calls free_vmap_area_noflush() (via iounmap()), which adds 2
    pages (one page plus the guard page) to the purge list and
    vmap_lazy_nr. vmap_lazy_nr is now lazy_max_pages() + 3, so the
    drain_vmap_work is scheduled.

 3. Thread returns from the kernel and is scheduled out.

 4. Worker thread is scheduled in and calls drain_vmap_area_work(). It
    frees the 2 pages on the purge list. vmap_lazy_nr is now
    lazy_max_pages() + 1.

 5. This is still over the threshold, so it tries to purge areas again,
    but doesn't find anything.

 6. Repeat 5.

If the system is running with only one CPU (which is typicial for kdump)
and preemption is disabled, then this will never make forward progress:
there aren't any more pages to purge, so it hangs.  If there is more
than one CPU or preemption is enabled, then the worker thread will spin
forever in the background.  (Note that if there were already pages to be
purged at the time that set_iounmap_nonlazy() was called, this bug is
avoided.)

This can be reproduced with anything that reads from /proc/vmcore
multiple times.  E.g., vmcore-dmesg /proc/vmcore.

It turns out that improvements to vmap() over the years have obsoleted
the need for this "optimization".  I benchmarked `dd if=/proc/vmcore
of=/dev/null` with 4k and 1M read sizes on a system with a 32GB vmcore.
The test was run on 5.17, 5.18-rc1 with a fix that avoided the hang, and
5.18-rc1 with set_iounmap_nonlazy() removed entirely:

    |5.17  |5.18+fix|5.18+removal
  4k|40.86s|  40.09s|      26.73s
  1M|24.47s|  23.98s|      21.84s

The removal was the fastest (by a wide margin with 4k reads).  This
patch removes set_iounmap_nonlazy().

Link: https://lkml.kernel.org/r/52f819991051f9b865e9ce25605509bfdbacadcd.1649277321.git.osandov@fb.com
Fixes: 690467c8  ("mm/vmalloc: Move draining areas out of caller context")
Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
Acked-by: default avatarChris Down <chris@chrisdown.name>
Reviewed-by: default avatarUladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarBaoquan He <bhe@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c12cd77c
    • Andrew Morton's avatar
      revert "fs/binfmt_elf: use PT_LOAD p_align values for static PIE" · aeb79237
      Andrew Morton authored 
      Despite Mike's attempted fix (925346c1), regressions reports
continue:

  https://lore.kernel.org/lkml/cb5b81bd-9882-e5dc-cd22-54bdbaaefbbc@leemhuis.info/
  https://bugzilla.kernel.org/show_bug.cgi?id=215720
  https://lkml.kernel.org/r/b685f3d0-da34-531d-1aa9-479accd3e21b@leemhuis.info

So revert this patch.

Fixes: 9630f0d6 ("fs/binfmt_elf: use PT_LOAD p_align values for static PIE")
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Chris Kennelly <ckennelly@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Fangrui Song <maskray@google.com>
Cc: H.J. Lu <hjl.tools@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Sandeep Patil <sspatil@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      aeb79237
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