1. 29 3月, 2016 1 次提交
  2. 26 3月, 2016 3 次提交
    • A
      mm, kasan: stackdepot implementation. Enable stackdepot for SLAB · cd11016e
      Alexander Potapenko 提交于
      Implement the stack depot and provide CONFIG_STACKDEPOT.  Stack depot
      will allow KASAN store allocation/deallocation stack traces for memory
      chunks.  The stack traces are stored in a hash table and referenced by
      handles which reside in the kasan_alloc_meta and kasan_free_meta
      structures in the allocated memory chunks.
      
      IRQ stack traces are cut below the IRQ entry point to avoid unnecessary
      duplication.
      
      Right now stackdepot support is only enabled in SLAB allocator.  Once
      KASAN features in SLAB are on par with those in SLUB we can switch SLUB
      to stackdepot as well, thus removing the dependency on SLUB stack
      bookkeeping, which wastes a lot of memory.
      
      This patch is based on the "mm: kasan: stack depots" patch originally
      prepared by Dmitry Chernenkov.
      
      Joonsoo has said that he plans to reuse the stackdepot code for the
      mm/page_owner.c debugging facility.
      
      [akpm@linux-foundation.org: s/depot_stack_handle/depot_stack_handle_t]
      [aryabinin@virtuozzo.com: comment style fixes]
      Signed-off-by: NAlexander Potapenko <glider@google.com>
      Signed-off-by: NAndrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andrey Konovalov <adech.fo@gmail.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Konstantin Serebryany <kcc@google.com>
      Cc: Dmitry Chernenkov <dmitryc@google.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      cd11016e
    • A
      arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections · be7635e7
      Alexander Potapenko 提交于
      KASAN needs to know whether the allocation happens in an IRQ handler.
      This lets us strip everything below the IRQ entry point to reduce the
      number of unique stack traces needed to be stored.
      
      Move the definition of __irq_entry to <linux/interrupt.h> so that the
      users don't need to pull in <linux/ftrace.h>.  Also introduce the
      __softirq_entry macro which is similar to __irq_entry, but puts the
      corresponding functions to the .softirqentry.text section.
      Signed-off-by: NAlexander Potapenko <glider@google.com>
      Acked-by: NSteven Rostedt <rostedt@goodmis.org>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Andrey Konovalov <adech.fo@gmail.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
      Cc: Konstantin Serebryany <kcc@google.com>
      Cc: Dmitry Chernenkov <dmitryc@google.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      be7635e7
    • T
      [IA64] Enable preadv2 and pwritev2 syscalls for ia64 · 2d5ae5c2
      Tony Luck 提交于
      New system calls added in:
            f17d8b35
            vfs: vfs: Define new syscalls preadv2,pwritev2
      Signed-off-by: NTony Luck <tony.luck@intel.com>
      2d5ae5c2
  3. 25 3月, 2016 5 次提交
    • Y
      h8300: switch EARLYCON · 8cad4892
      Yoshinori Sato 提交于
      earlyprintk is architecture specific option.
      earlycon is generic and small footprint.
      Signed-off-by: NYoshinori Sato <ysato@users.sourceforge.jp>
      8cad4892
    • G
      h8300: dts: Rename the serial port clock to fck · d8581616
      Geert Uytterhoeven 提交于
      The clock is really the device functional clock, not the interface
      clock. Rename it.
      Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
      Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
      d8581616
    • M
      arm64: mm: allow preemption in copy_to_user_page · 691b1e2e
      Mark Rutland 提交于
      Currently we disable preemption in copy_to_user_page; a behaviour that
      we inherited from the 32-bit arm code. This was necessary for older
      cores without broadcast data cache maintenance, and ensured that cache
      lines were dirtied and cleaned by the same CPU. On these systems dirty
      cache line migration was not possible, so this was sufficient to
      guarantee coherency.
      
      On contemporary systems, cache coherence protocols permit (dirty) cache
      lines to migrate between CPUs as a result of speculation, prefetching,
      and other behaviours. To account for this, in ARMv8 data cache
      maintenance operations are broadcast and affect all data caches in the
      domain associated with the VA (i.e. ISH for kernel and user mappings).
      
      In __switch_to we ensure that tasks can be safely migrated in the middle
      of a maintenance sequence, using a dsb(ish) to ensure prior explicit
      memory accesses are observed and cache maintenance operations are
      completed before a task can be run on another CPU.
      
      Given the above, it is not necessary to disable preemption in
      copy_to_user_page. This patch removes the preempt_{disable,enable}
      calls, permitting preemption.
      Signed-off-by: NMark Rutland <mark.rutland@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      691b1e2e
    • M
      arm64: consistently use p?d_set_huge · c661cb1c
      Mark Rutland 提交于
      Commit 324420bf ("arm64: add support for ioremap() block
      mappings") added new p?d_set_huge functions which do the hard work to
      generate and set a correct block entry.
      
      These differ from open-coded huge page creation in the early page table
      code by explicitly setting the P?D_TYPE_SECT bits (which are implicitly
      retained by mk_sect_prot() for any valid prot), but are otherwise
      identical (and cannot fail on arm64).
      
      For simplicity and consistency, make use of these in the initial page
      table creation code.
      Signed-off-by: NMark Rutland <mark.rutland@arm.com>
      Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
      Cc: Will Deacon <will.deacon@arm.com>
      Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      c661cb1c
    • A
      arm64: kaslr: use callee saved register to preserve SCTLR across C call · d5e57437
      Ard Biesheuvel 提交于
      The KASLR code incorrectly expects the contents of x18 to be preserved
      across a call into C code, and uses it to stash the contents of SCTLR_EL1
      before enabling the MMU. If the MMU needs to be disabled again to create
      the randomized kernel mapping, x18 is written back to SCTLR_EL1, which is
      likely to crash the system if x18 has been clobbered by kasan_early_init()
      or kaslr_early_init(). So use x22 instead, which is not in use so far in
      head.S
      Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
      Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      d5e57437
  4. 23 3月, 2016 18 次提交
  5. 22 3月, 2016 13 次提交