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mm/swapfile.c: do not skip lowest_bit in scan_swap_map() scan loop

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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 <[email protected]>
Cc: Shaohua Li <[email protected]>
Acked-by: Hugh Dickins <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Akinobu Mita <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jamie Liu 2014-01-23 15:53:40 -08:00 • committed by Linus Torvalds
commit a5998061da
1 changed files with 2 additions and 1 deletions
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3
mm/swapfile.c
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@ -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);