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| author | Zhenzhong Duan <zhenzhong.duan@oracle.com> | 2012-09-21 16:40:30 +0800 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-09-21 10:37:45 -0400 |
| commit | a00bb1e9fc0925c0061e9d844523a3a47a7e2f7f (patch) | |
| tree | e4a276b1d44e5b34765377698260f9f857bff85a /mm | |
| parent | 15773b68fc5854e8890a8e251c568d583a540e4c (diff) | |
| download | linux-a00bb1e9fc0925c0061e9d844523a3a47a7e2f7f.tar.bz2 | |
mm: frontswap: fix a wrong if condition in frontswap_shrink
pages_to_unuse is set to 0 to unuse all frontswap pages
But that doesn't happen since a wrong condition in frontswap_shrink
cancel it.
-v2: Add comment to explain return value of __frontswap_shrink,
as suggested by Dan Carpenter, thanks
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/frontswap.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/frontswap.c b/mm/frontswap.c index 89dc399d3328..0547a35f798b 100644 --- a/mm/frontswap.c +++ b/mm/frontswap.c @@ -263,6 +263,11 @@ static int __frontswap_unuse_pages(unsigned long total, unsigned long *unused, return ret; } +/* + * Used to check if it's necessory and feasible to unuse pages. + * Return 1 when nothing to do, 0 when need to shink pages, + * error code when there is an error. + */ static int __frontswap_shrink(unsigned long target_pages, unsigned long *pages_to_unuse, int *type) @@ -275,7 +280,7 @@ static int __frontswap_shrink(unsigned long target_pages, if (total_pages <= target_pages) { /* Nothing to do */ *pages_to_unuse = 0; - return 0; + return 1; } total_pages_to_unuse = total_pages - target_pages; return __frontswap_unuse_pages(total_pages_to_unuse, pages_to_unuse, type); @@ -302,7 +307,7 @@ void frontswap_shrink(unsigned long target_pages) spin_lock(&swap_lock); ret = __frontswap_shrink(target_pages, &pages_to_unuse, &type); spin_unlock(&swap_lock); - if (ret == 0 && pages_to_unuse) + if (ret == 0) try_to_unuse(type, true, pages_to_unuse); return; } |