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    mm, kasan: stackdepot implementation. Enable stackdepot for SLAB · cd11016e
    Alexander Potapenko authored
    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
    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.
    [ s/depot_stack_handle/depot_stack_handle_t]
    [ comment style fixes]
    Signed-off-by: default avatarAlexander Potapenko <>
    Signed-off-by: default avatarAndrey Ryabinin <>
    Cc: Christoph Lameter <>
    Cc: Pekka Enberg <>
    Cc: David Rientjes <>
    Cc: Joonsoo Kim <>
    Cc: Andrey Konovalov <>
    Cc: Dmitry Vyukov <>
    Cc: Steven Rostedt <>
    Cc: Konstantin Serebryany <>
    Cc: Dmitry Chernenkov <>
    Signed-off-by: default avatarAndrew Morton <>
    Signed-off-by: default avatarLinus Torvalds <>