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lib/stackdepot.c: allow the stack trace hash to be zero

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Do not bail out from depot_save_stack() if the stack trace has zero hash.
Initially depot_save_stack() silently dropped stack traces with zero
hashes, however there's actually no point in reserving this zero value.

Reported-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Potapenko 2016-04-28 16:19:09 -07:00 committed by Linus Torvalds
parent 99f23c2cde
commit 33334e2576
1 changed files with 0 additions and 4 deletions
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4
lib/stackdepot.c
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@ -210,10 +210,6 @@ depot_stack_handle_t depot_save_stack(struct stack_trace *trace,
goto fast_exit; goto fast_exit;
hash = hash_stack(trace->entries, trace->nr_entries); hash = hash_stack(trace->entries, trace->nr_entries);
/* Bad luck, we won't store this stack. */
if (hash == 0)
goto exit;
bucket = &stack_table[hash & STACK_HASH_MASK]; bucket = &stack_table[hash & STACK_HASH_MASK];
/* /*