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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 <[email protected]>
Signed-off-by: Alexander Potapenko <[email protected]>
Acked-by: Andrey Ryabinin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alexander Potapenko authored and Linus Torvalds committed 2016-04-28 19:34:04 -07:00
1 parent 99f23c2cde
commit 33334e2576
1 file changed
-4
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lib/stackdepot.c
-4
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@@ -210,10 +210,6 @@ depot_stack_handle_t depot_save_stack(struct stack_trace *trace,
goto fast_exit;
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];
/*