mm/swapfile.c: use kvzalloc for swap_info_struct allocation

Commit a2468cc9bfdf ("swap: choose swap device according to numa node")
changed 'avail_lists' field of 'struct swap_info_struct' to an array.
In popular linux distros it increased size of swap_info_struct up to 40
Kbytes and now swap_info_struct allocation requires order-4 page.
Switch to kvzmalloc allows to avoid unexpected allocation failures.

Link: http://lkml.kernel.org/r/fc23172d-3c75-21e2-d551-8b1808cbe593@virtuozzo.com
Fixes: a2468cc9bfdf ("swap: choose swap device according to numa node")
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Acked-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Huang Ying <ying.huang@intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 644f746..8688ae6 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2813,7 +2813,7 @@ static struct swap_info_struct *alloc_swap_info(void)
        unsigned int type;
        int i;
 
-       p = kzalloc(sizeof(*p), GFP_KERNEL);
+       p = kvzalloc(sizeof(*p), GFP_KERNEL);
        if (!p)
                return ERR_PTR(-ENOMEM);
 
@@ -2824,7 +2824,7 @@ static struct swap_info_struct *alloc_swap_info(void)
        }
        if (type >= MAX_SWAPFILES) {
                spin_unlock(&swap_lock);
-               kfree(p);
+               kvfree(p);
                return ERR_PTR(-EPERM);
        }
        if (type >= nr_swapfiles) {
@@ -2838,7 +2838,7 @@ static struct swap_info_struct *alloc_swap_info(void)
                smp_wmb();
                nr_swapfiles++;
        } else {
-               kfree(p);
+               kvfree(p);
                p = swap_info[type];
                /*
                 * Do not memset this entry: a racing procfs swap_next()