Messages in this thread Patch in this message | | | From | Qian Cai <> | Subject | [PATCH] mm/memblock: skip kmemleak for kasan_init() | Date | Wed, 28 Nov 2018 12:40:33 -0500 |
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Kmemleak does not play well with KASAN (tested on both HPE Apollo 70 and Huawei TaiShan 2280 aarch64 servers).
After calling start_kernel()->setup_arch()->kasan_init(), kmemleak early log buffer went from something like 280 to 260000 which caused kmemleak disabled and crash dump memory reservation failed. The multitude of kmemleak_alloc() calls is from,
for_each_memblock(memory, reg) x \ while (pgdp++, addr = next, addr != end) x \ while (pudp++, addr = next, addr != end && pud_none(READ_ONCE(*pudp))) \ while (pmdp++, addr = next, addr != end && pmd_none(READ_ONCE(*pmdp))) \ while (ptep++, addr = next, addr != end && pte_none(READ_ONCE(*ptep)))
Signed-off-by: Qian Cai <cai@gmx.us> --- mm/memblock.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/mm/memblock.c b/mm/memblock.c index 9a2d5ae..fd78e39 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1412,6 +1412,8 @@ static void * __init memblock_alloc_internal( done: ptr = phys_to_virt(alloc); +/* Skip kmemleak for kasan_init() due to high volume. */ +#ifndef CONFIG_KASAN /* * The min_count is set to 0 so that bootmem allocated blocks * are never reported as leaks. This is because many of these blocks @@ -1419,6 +1421,7 @@ static void * __init memblock_alloc_internal( * looked up by kmemleak. */ kmemleak_alloc(ptr, size, 0, 0); +#endif return ptr; } -- 1.8.3.1
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