1. 13 Jul, 2015 2 commits
  2. 10 Jul, 2015 7 commits
    • Linus Torvalds's avatar
      Merge branch 'parisc-4.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux · b9243b5a
      Linus Torvalds authored
      Pull parisc fixes from Helge Deller:
       "We have one important patch from Dave Anglin and myself which fixes
        PTE/TLB race conditions which caused random segmentation faults on our
        debian buildd servers, and one patch from Alex Ivanov which speeds up
        the graphical text console on the STI framebuffer driver"
      
      * 'parisc-4.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
        parisc: Fix some PTE/TLB race conditions and optimize __flush_tlb_range based on timing results
        stifb: Implement hardware accelerated copyarea
      b9243b5a
    • Linus Torvalds's avatar
      Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux · 1604f871
      Linus Torvalds authored
      Pull arm64 fixes and clean-up from Catalin Marinas:
       - ACPI fix when checking the validity of the GICC MADT subtable
       - handle debug exceptions in the el*_inv exception entries
       - remove pointless register assignment in two compat syscall wrappers
       - unnecessary include path
       - defconfig update
      
      * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
        arm64: entry32: remove pointless register assignment
        arm64: entry: handle debug exceptions in el*_inv
        arm64: Keep the ARM64 Kconfig selects sorted
        ACPI / ARM64 : use the new BAD_MADT_GICC_ENTRY macro
        ACPI / ARM64: add BAD_MADT_GICC_ENTRY() macro
        arm64: defconfig: Add Ceva ahci to the defconfig
        arm64: remove another unnecessary libfdt include path
      1604f871
    • John David Anglin's avatar
      parisc: Fix some PTE/TLB race conditions and optimize __flush_tlb_range based on timing results · 01ab6057
      John David Anglin authored
      The increased use of pdtlb/pitlb instructions seemed to increase the
      frequency of random segmentation faults building packages. Further, we
      had a number of cases where TLB inserts would repeatedly fail and all
      forward progress would stop. The Haskell ghc package caused a lot of
      trouble in this area. The final indication of a race in pte handling was
      this syslog entry on sibaris (C8000):
      
       swap_free: Unused swap offset entry 00000004
       BUG: Bad page map in process mysqld  pte:00000100 pmd:019bbec5
       addr:00000000ec464000 vm_flags:00100073 anon_vma:0000000221023828 mapping: (null) index:ec464
       CPU: 1 PID: 9176 Comm: mysqld Not tainted 4.0.0-2-parisc64-smp #1 Debian 4.0.5-1
       Backtrace:
        [<0000000040173eb0>] show_stack+0x20/0x38
        [<0000000040444424>] dump_stack+0x9c/0x110
        [<00000000402a0d38>] print_bad_pte+0x1a8/0x278
        [<00000000402a28b8>] unmap_single_vma+0x3d8/0x770
        [<00000000402a4090>] zap_page_range+0xf0/0x198
        [<00000000402ba2a4>] SyS_madvise+0x404/0x8c0
      
      Note that the pte value is 0 except for the accessed bit 0x100. This bit
      shouldn't be set without the present bit.
      
      It should be noted that the madvise system call is probably a trigger for many
      of the random segmentation faults.
      
      In looking at the kernel code, I found the following problems:
      
      1) The pte_clear define didn't take TLB lock when clearing a pte.
      2) We didn't test pte present bit inside lock in exception support.
      3) The pte and tlb locks needed to merged in order to ensure consistency
      between page table and TLB. This also has the effect of serializing TLB
      broadcasts on SMP systems.
      
      The attached change implements the above and a few other tweaks to try
      to improve performance. Based on the timing code, TLB purges are very
      slow (e.g., ~ 209 cycles per page on rp3440). Thus, I think it
      beneficial to test the split_tlb variable to avoid duplicate purges.
      Probably, all PA 2.0 machines have combined TLBs.
      
      I dropped using __flush_tlb_range in flush_tlb_mm as I realized all
      applications and most threads have a stack size that is too large to
      make this useful. I added some comments to this effect.
      
      Since implementing 1 through 3, I haven't had any random segmentation
      faults on mx3210 (rp3440) in about one week of building code and running
      as a Debian buildd.
      Signed-off-by: default avatarJohn David Anglin <dave.anglin@bell.net>
      Cc: stable@vger.kernel.org # v3.18+
      Signed-off-by: default avatarHelge Deller <deller@gmx.de>
      01ab6057
    • Alex Ivanov's avatar
      stifb: Implement hardware accelerated copyarea · cb908ed3
      Alex Ivanov authored
      This patch adds hardware assisted scrolling. The code is based upon the
      following investigation: https://parisc.wiki.kernel.org/index.php/NGLE#Blitter
      
      A simple 'time ls -la /usr/bin' test shows 1.6x speed increase over soft
      copy and 2.3x increase over FBINFO_READS_FAST (prefer soft copy over
      screen redraw) on Artist framebuffer.
      Signed-off-by: default avatarAlex Ivanov <lausgans@gmail.com>
      Signed-off-by: default avatarHelge Deller <deller@gmx.de>
      cb908ed3
    • Linus Torvalds's avatar
      Merge tag 'powerpc-4.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · 3cdeb9d1
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       - opal-prd mmap fix from Vaidy
       - set kernel taint for MCEs from Daniel
       - alignment exception description from Anton
       - ppc4xx_hsta_msi build fix from Daniel
       - opal-elog interrupt fix from Alistair
       - core_idle_state race fix from Shreyas
       - hv-24x7 lockdep fix from Sukadev
       - multiple cxl fixes from Daniel, Ian, Mikey & Maninder
       - update MAINTAINERS to point at shared tree
      
      * tag 'powerpc-4.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        cxl: Check if afu is not null in cxl_slbia
        powerpc: Update MAINTAINERS to point at shared tree
        powerpc/perf/24x7: Fix lockdep warning
        cxl: Fix off by one error allowing subsequent mmap page to be accessed
        cxl: Fail mmap if requested mapping is larger than assigned problem state area
        cxl: Fix refcounting in kernel API
        powerpc/powernv: Fix race in updating core_idle_state
        powerpc/powernv: Fix opal-elog interrupt handler
        powerpc/ppc4xx_hsta_msi: Include ppc-pci.h to fix reference to hose_list
        powerpc: Add plain English description for alignment exception oopses
        cxl: Test the correct mmio space before unmapping
        powerpc: Set the correct kernel taint on machine check errors
        cxl/vphb.c: Use phb pointer after NULL check
        powerpc/powernv: Fix vma page prot flags in opal-prd driver
      3cdeb9d1
    • Mark Rutland's avatar
      arm64: entry32: remove pointless register assignment · ad2daa85
      Mark Rutland authored
      We currently set x27 in compat_sys_sigreturn_wrapper and
      compat_sys_rt_sigreturn_wrapper, similarly to what we do with r8/why on
      32-bit ARM, in an attempt to prevent sigreturns from being restarted.
      
      However, on arm64 we have always used pt_regs::syscallno for syscall
      restarting (for both native and compat tasks), and x27 is never
      inspected again before being overwritten in kernel_exit.
      
      This patch removes the pointless register assignments.
      Signed-off-by: default avatarMark Rutland <mark.rutland@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      ad2daa85
    • Daniel Axtens's avatar
      cxl: Check if afu is not null in cxl_slbia · 2c069a11
      Daniel Axtens authored
      The pointer to an AFU in the adapter's list of AFUs can be null
      if we're in the process of removing AFUs. The afu_list_lock
      doesn't guard against this.
      
      Say we have 2 slices, and we're in the process of removing cxl.
       - We remove the AFUs in order (see cxl_remove). In cxl_remove_afu
         for AFU 0, we take the lock, set adapter->afu[0] = NULL, and
         release the lock.
       - Then we get an slbia. In cxl_slbia we take the lock, and set
         afu = adapter->afu[0], which is NULL.
       - Therefore our attempt to check afu->enabled will blow up.
      
      Therefore, check if afu is a null pointer before dereferencing it.
      
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarDaniel Axtens <dja@axtens.net>
      Acked-by: default avatarMichael Neuling <mikey@neuling.org>
      Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      2c069a11
  3. 09 Jul, 2015 16 commits
  4. 08 Jul, 2015 8 commits
  5. 07 Jul, 2015 7 commits