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authorMika Kukkonen <mikukkon@miku.homelinux.net>2007-05-10 22:22:17 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-11 08:29:32 -0700
commit7faaa5f0bf4db6ac4908038e2139adc46c165ff4 (patch)
treee6efe930b1749b4f133945468dad807c43fe1732 /mm/thrash.c
parent069f11f9d66bc582fb40a37a7b92363f5d321969 (diff)
downloadconfigs-7faaa5f0bf4db6ac4908038e2139adc46c165ff4.tar.gz
Bug in mm/thrash.c function grab_swap_token()
Following bug was uncovered by compiling with '-W' flag: CC mm/thrash.o mm/thrash.c: In function ‘grab_swap_token’: mm/thrash.c:52: warning: comparison of unsigned expression < 0 is always false Variable token_priority is unsigned, so decrementing first and then checking the result does not work; fixed by reversing the test, patch attached (compile tested only). I am not sure if likely() makes much sense in this new situation, but I'll let somebody else to make a decision on that. Signed-off-by: Mika Kukkonen <mikukkon@iki.fi> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/thrash.c')
-rw-r--r--mm/thrash.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/thrash.c b/mm/thrash.c
index 9ef9071f99b..c4c5205a9c3 100644
--- a/mm/thrash.c
+++ b/mm/thrash.c
@@ -48,9 +48,8 @@ void grab_swap_token(void)
if (current_interval < current->mm->last_interval)
current->mm->token_priority++;
else {
- current->mm->token_priority--;
- if (unlikely(current->mm->token_priority < 0))
- current->mm->token_priority = 0;
+ if (likely(current->mm->token_priority > 0))
+ current->mm->token_priority--;
}
/* Check if we deserve the token */
if (current->mm->token_priority >