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| author | Cesar Eduardo Barros <cesarb@cesarb.net> | 2011-03-22 16:33:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-22 17:44:07 -0700 |
| commit | 5de771e41f0fc2243c39585357b73f0ff757b280 (patch) | |
| tree | a807bb46f4334b6697c0dba7dc80075e8dccae5f /mm/swapfile.c | |
| parent | 87ade72a799a9a895b4a60918c32b43d3dfc3324 (diff) | |
| download | linux-5de771e41f0fc2243c39585357b73f0ff757b280.tar.gz | |
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>
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 3 |
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"); |