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authorJamie Liu <jamieliu@google.com>2014-01-23 15:53:40 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:36:53 -0800
commita5998061daab27802c418debe662be98a6e42874 (patch)
tree8ca230b5f9917c6cac82011d1b6feb12014341bc
parent0d8a4a3799ab007b7a5e50aff9da9558925e0c15 (diff)
downloadop-kernel-dev-a5998061daab27802c418debe662be98a6e42874.zip
op-kernel-dev-a5998061daab27802c418debe662be98a6e42874.tar.gz
mm/swapfile.c: do not skip lowest_bit in scan_swap_map() scan loop
In the second half of scan_swap_map()'s scan loop, offset is set to si->lowest_bit and then incremented before entering the loop for the first time, causing si->swap_map[si->lowest_bit] to be skipped. Signed-off-by: Jamie Liu <jamieliu@google.com> Cc: Shaohua Li <shli@fusionio.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/swapfile.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index d443dea..c6c13b05 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -616,7 +616,7 @@ scan:
}
}
offset = si->lowest_bit;
- while (++offset < scan_base) {
+ while (offset < scan_base) {
if (!si->swap_map[offset]) {
spin_lock(&si->lock);
goto checks;
@@ -629,6 +629,7 @@ scan:
cond_resched();
latency_ration = LATENCY_LIMIT;
}
+ offset++;
}
spin_lock(&si->lock);
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