The patch titled Subject: mm/swapfile.c: use kvzalloc for swap_info_struct allocation has been added to the -mm tree. Its filename is mm-use-kvzalloc-for-swap_info_struct-allocation.patch

This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-use-kvzalloc-for-swap_info_struc... and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-use-kvzalloc-for-swap_info_struc...

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/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated there every 3-4 working days

------------------------------------------------------ From: Vasily Averin vvs@virtuozzo.com Subject: mm/swapfile.c: use kvzalloc for swap_info_struct allocation

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 ---

mm/swapfile.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/mm/swapfile.c~mm-use-kvzalloc-for-swap_info_struct-allocation +++ a/mm/swapfile.c @@ -2813,7 +2813,7 @@ static struct swap_info_struct *alloc_sw 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_sw } 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_sw smp_wmb(); nr_swapfiles++; } else { - kfree(p); + kvfree(p); p = swap_info[type]; /* * Do not memset this entry: a racing procfs swap_next() _

Patches currently in -mm which might be from vvs@virtuozzo.com are

mm-use-kvzalloc-for-swap_info_struct-allocation.patch