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drivers/md/dm-ioctl.c: use kvmalloc rather than opencoded variant

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copy_params uses kmalloc with vmalloc fallback.  We already have a
helper for that - kvmalloc.  This caller requires GFP_NOIO semantic so
it hasn't been converted with many others by previous patches.  All we
need to achieve this semantic is to use the scope
memalloc_noio_{save,restore} around kvmalloc.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michal Hocko <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Mikulas Patocka <[email protected]>
Cc: Mike Snitzer <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Hocko authored and Linus Torvalds committed 2017-05-08 17:15:13 -07:00
1 parent da6bc57a8f
commit d224e93818
1 file changed
+4 -9
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drivers/md/dm-ioctl.c
+4 -9
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@@ -1691,6 +1691,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
struct dm_ioctl *dmi;
int secure_data;
const size_t minimum_data_size = offsetof(struct dm_ioctl, data);
unsigned noio_flag;
if (copy_from_user(param_kernel, user, minimum_data_size))
return -EFAULT;
@@ -1713,15 +1714,9 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
* Use kmalloc() rather than vmalloc() when we can.
*/
dmi = NULL;
if (param_kernel->data_size <= KMALLOC_MAX_SIZE)
dmi = kmalloc(param_kernel->data_size, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
if (!dmi) {
unsigned noio_flag;
noio_flag = memalloc_noio_save();
dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL);
memalloc_noio_restore(noio_flag);
}
noio_flag = memalloc_noio_save();
dmi = kvmalloc(param_kernel->data_size, GFP_KERNEL);
memalloc_noio_restore(noio_flag);
if (!dmi) {
if (secure_data && clear_user(user, param_kernel->data_size))