The patch titled sys_swapon: move setting of swapfilepages near use has been added to the -mm tree. Its filename is sys_swapon-move-setting-of-swapfilepages-near-use.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: sys_swapon: move setting of swapfilepages near use From: Cesar Eduardo Barros <cesarb@xxxxxxxxxx> 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@xxxxxxxxxx> Tested-by: Eric B Munson <emunson@xxxxxxxxx> Acked-by: Eric B Munson <emunson@xxxxxxxxx> Reviewed-by: Jesper Juhl <jj@xxxxxxxxxxxxx> Reviewed-by: Pekka Enberg <penberg@xxxxxxxxxx> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/swapfile.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff -puN mm/swapfile.c~sys_swapon-move-setting-of-swapfilepages-near-use mm/swapfile.c --- a/mm/swapfile.c~sys_swapon-move-setting-of-swapfilepages-near-use +++ a/mm/swapfile.c @@ -1975,8 +1975,6 @@ SYSCALL_DEFINE2(swapon, const char __use 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 __use 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"); _ Patches currently in -mm which might be from cesarb@xxxxxxxxxx are sys_swapon-use-vzalloc-instead-of-vmalloc-memset.patch sys_swapon-remove-changelog-from-function-comment.patch sys_swapon-do-not-depend-on-type-after-allocation.patch sys_swapon-separate-swap_info-allocation.patch sys_swapon-simplify-error-return-from-swap_info-allocation.patch sys_swapon-simplify-error-flow-in-alloc_swap_info.patch sys_swapon-remove-initial-value-of-name-variable.patch sys_swapon-move-setting-of-error-nearer-use.patch sys_swapon-remove-did_down-variable.patch sys_swapon-remove-bdev-variable.patch sys_swapon-do-only-cleanup-in-the-cleanup-blocks.patch sys_swapon-use-a-single-error-label.patch sys_swapon-separate-bdev-claim-and-inode-lock.patch sys_swapon-simplify-error-flow-in-claim_swapfile.patch sys_swapon-move-setting-of-swapfilepages-near-use.patch sys_swapon-separate-parsing-of-swapfile-header.patch sys_swapon-simplify-error-flow-in-read_swap_header.patch sys_swapon-call-swap_cgroup_swapon-earlier.patch sys_swapon-separate-parsing-of-bad-blocks-and-extents.patch sys_swapon-simplify-error-flow-in-setup_swap_map_and_extents.patch sys_swapon-remove-nr_good_pages-variable.patch sys_swapon-move-printk-outside-lock.patch sys_swapoff-change-order-to-match-sys_swapon.patch sys_swapon-separate-final-enabling-of-the-swapfile.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html