From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id 95F0A8D003A for ; Sat, 5 Mar 2011 11:42:38 -0500 (EST) Received: from unknown (HELO localhost.localdomain) (zcncxNmDysja2tXBptWToZWJlF6Wp6IuYnI=@[200.157.204.20]) (envelope-sender ) by smtp-03.mandic.com.br (qmail-ldap-1.03) with AES256-SHA encrypted SMTP for ; 5 Mar 2011 16:42:34 -0000 From: Cesar Eduardo Barros Subject: [PATCHv2 03/24] sys_swapon: do not depend on "type" after allocation Date: Sat, 5 Mar 2011 13:42:04 -0300 Message-Id: <1299343345-3984-4-git-send-email-cesarb@cesarb.net> In-Reply-To: <1299343345-3984-1-git-send-email-cesarb@cesarb.net> References: <1299343345-3984-1-git-send-email-cesarb@cesarb.net> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Andrew Morton , Hugh Dickins , KAMEZAWA Hiroyuki , Minchan Kim , Jens Axboe , linux-kernel@vger.kernel.org, Eric B Munson , Cesar Eduardo Barros Within sys_swapon, after the swap_info entry has been allocated, we always have type == p->type and swap_info[type] == p. Use this fact to reduce the dependency on the "type" local variable within the function, as a preparation to move the allocation of the swap_info entry to a separate function. Signed-off-by: Cesar Eduardo Barros Tested-by: Eric B Munson Acked-by: Eric B Munson --- mm/swapfile.c | 10 +++++----- 1 files changed, 5 insertions(+), 5 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index 75ee39c..3ef2d67 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1927,7 +1927,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) for (i = 0; i < nr_swapfiles; i++) { struct swap_info_struct *q = swap_info[i]; - if (i == type || !q->swap_file) + if (q == p || !q->swap_file) continue; if (mapping == q->swap_file->f_mapping) goto bad_swap; @@ -2062,7 +2062,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) } } - error = swap_cgroup_swapon(type, maxpages); + error = swap_cgroup_swapon(p->type, maxpages); if (error) goto bad_swap; @@ -2120,9 +2120,9 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) } p->next = i; if (prev < 0) - swap_list.head = swap_list.next = type; + swap_list.head = swap_list.next = p->type; else - swap_info[prev]->next = type; + swap_info[prev]->next = p->type; spin_unlock(&swap_lock); mutex_unlock(&swapon_mutex); atomic_inc(&proc_poll_event); @@ -2136,7 +2136,7 @@ bad_swap: blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); } destroy_swap_extents(p); - swap_cgroup_swapoff(type); + swap_cgroup_swapoff(p->type); bad_swap_2: spin_lock(&swap_lock); p->swap_file = NULL; -- 1.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org