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authorCesar Eduardo Barros <cesarb@cesarb.net>2011-03-22 16:33:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-22 17:44:07 -0700
commit5de771e41f0fc2243c39585357b73f0ff757b280 (patch)
treea807bb46f4334b6697c0dba7dc80075e8dccae5f
parent87ade72a799a9a895b4a60918c32b43d3dfc3324 (diff)
downloadlinux-5de771e41f0fc2243c39585357b73f0ff757b280.tar.bz2
sys_swapon: move setting of swapfilepages near use
There is no reason I can see to read inode->i_size long before it is needed. Move its read to just before it is needed, to reduce the variable lifetime. Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net> Tested-by: Eric B Munson <emunson@mgebm.net> Acked-by: Eric B Munson <emunson@mgebm.net> Reviewed-by: Jesper Juhl <jj@chaosbits.net> Reviewed-by: Pekka Enberg <penberg@kernel.org> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hugh Dickins <hughd@google.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, 1 insertions, 2 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 61a604c12a96..4dade515b086 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1975,8 +1975,6 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
if (unlikely(error))
goto bad_swap;
- swapfilepages = i_size_read(inode) >> PAGE_SHIFT;
-
/*
* Read the swap header.
*/
@@ -2045,6 +2043,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
error = -EINVAL;
if (!maxpages)
goto bad_swap;
+ swapfilepages = i_size_read(inode) >> PAGE_SHIFT;
if (swapfilepages && maxpages > swapfilepages) {
printk(KERN_WARNING
"Swap area shorter than signature indicates\n");