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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2013-11-13 00:07:47 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-11-13 04:09:07 +0100
commit58e97ba6b1a0c78d0c847998cf3bcfa5344c19aa (patch)
tree7823e9d881d7bcd128d92c72f060a86a31a6bd42
parentmm/swapfile.c: fix comment typos (diff)
downloadlinux-58e97ba6b1a0c78d0c847998cf3bcfa5344c19aa.tar.xz
linux-58e97ba6b1a0c78d0c847998cf3bcfa5344c19aa.zip
frontswap: enable call to invalidate area on swapoff
During swapoff the frontswap_map was NULL-ified before calling frontswap_invalidate_area(). However the frontswap_invalidate_area() exits early if frontswap_map is NULL. Invalidate was never called during swapoff. This patch moves frontswap_map_set() in swapoff just after calling frontswap_invalidate_area() so outside of locks (swap_lock and swap_info_struct->lock). This shouldn't be a problem as during swapon the frontswap_map_set() is called also outside of any locks. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Seth Jennings <sjenning@linux.vnet.ibm.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Shaohua Li <shli@fusionio.com> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/swapfile.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 64458e3997bc..612a7c9795f6 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1924,10 +1924,10 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
p->cluster_info = NULL;
p->flags = 0;
frontswap_map = frontswap_map_get(p);
- frontswap_map_set(p, NULL);
spin_unlock(&p->lock);
spin_unlock(&swap_lock);
frontswap_invalidate_area(type);
+ frontswap_map_set(p, NULL);
mutex_unlock(&swapon_mutex);
free_percpu(p->percpu_cluster);
p->percpu_cluster = NULL;