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authorQian Cai <cai@gmx.us>2018-12-28 00:36:29 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-28 12:11:49 -0800
commitfed84c78527009d4f799a3ed9a566502fa026d82 (patch)
treedafd4dfb1c41319e044728c6825fc7c65c5d52d6 /mm
parent65c78784135f847e49eb98e6b976e453e71100c3 (diff)
mm/memblock.c: skip kmemleak for kasan_init()
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 nested loops while KASAN is setting up full memory mappings, so let early kmemleak allocations skip those memblock_alloc_internal() calls came from kasan_init() given that those early KASAN memory mappings should not reference to other memory. Hence, no kmemleak false positives. kasan_init kasan_map_populate [1] kasan_pgd_populate [2] kasan_pud_populate [3] kasan_pmd_populate [4] kasan_pte_populate [5] kasan_alloc_zeroed_page memblock_alloc_try_nid memblock_alloc_internal kmemleak_alloc [1] for_each_memblock(memory, reg) [2] while (pgdp++, addr = next, addr != end) [3] while (pudp++, addr = next, addr != end && pud_none(READ_ONCE(*pudp))) [4] while (pmdp++, addr = next, addr != end && pmd_none(READ_ONCE(*pmdp))) [5] while (ptep++, addr = next, addr != end && pte_none(READ_ONCE(*ptep))) Link: http://lkml.kernel.org/r/1543442925-17794-1-git-send-email-cai@gmx.us Signed-off-by: Qian Cai <cai@gmx.us> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memblock.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index f57d7620668b..022d4cbb3618 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -262,7 +262,8 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
phys_addr_t kernel_end, ret;
/* pump up @end */
- if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
+ if (end == MEMBLOCK_ALLOC_ACCESSIBLE ||
+ end == MEMBLOCK_ALLOC_KASAN)
end = memblock.current_limit;
/* avoid allocating the first page */
@@ -1419,13 +1420,15 @@ again:
done:
ptr = phys_to_virt(alloc);
- /*
- * The min_count is set to 0 so that bootmem allocated blocks
- * are never reported as leaks. This is because many of these blocks
- * are only referred via the physical address which is not
- * looked up by kmemleak.
- */
- kmemleak_alloc(ptr, size, 0, 0);
+ /* Skip kmemleak for kasan_init() due to high volume. */
+ if (max_addr != MEMBLOCK_ALLOC_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 are only referred via the physical
+ * address which is not looked up by kmemleak.
+ */
+ kmemleak_alloc(ptr, size, 0, 0);
return ptr;
}