[PATCH] md: simplify free_params for kmalloc vs vmalloc fallback

[Michal Hocko]

From: Michal Hocko <mho...@suse.com>

Use kvfree rather than DM_PARAMS_[KV]MALLOC specific param flags.

Cc: Shaohua Li <s...@kernel.org>
Cc: Mikulas Patocka <mpato...@redhat.com>
Cc: dm-de...@redhat.com
Signed-off-by: Michal Hocko <mho...@suse.com>
---
Hi,
this is a rebase on top of dropped "dm: clean up GFP_NIO usage" which
should be dropped as per the feedback from Mikulas.

 drivers/md/dm-ioctl.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 2c7ca258c4e4..e66e5b43bc18 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1670,19 +1670,14 @@ static int check_version(unsigned int cmd, struct 
dm_ioctl __user *user)
        return r;
 }
 
-#define DM_PARAMS_KMALLOC      0x0001  /* Params alloced with kmalloc */
-#define DM_PARAMS_VMALLOC      0x0002  /* Params alloced with vmalloc */
-#define DM_WIPE_BUFFER         0x0010  /* Wipe input buffer before returning 
from ioctl */
+#define DM_WIPE_BUFFER         0x0001  /* Wipe input buffer before returning 
from ioctl */
 
 static void free_params(struct dm_ioctl *param, size_t param_size, int 
param_flags)
 {
        if (param_flags & DM_WIPE_BUFFER)
                memset(param, 0, param_size);
 
-       if (param_flags & DM_PARAMS_KMALLOC)
-               kfree(param);
-       if (param_flags & DM_PARAMS_VMALLOC)
-               vfree(param);
+       kvfree(param);
 }
 
 static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl 
*param_kernel,
@@ -1714,19 +1709,14 @@ 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) {
+       if (param_kernel->data_size <= KMALLOC_MAX_SIZE)
                dmi = kmalloc(param_kernel->data_size, GFP_NOIO | __GFP_NORETRY 
| __GFP_NOMEMALLOC | __GFP_NOWARN);
-               if (dmi)
-                       *param_flags |= DM_PARAMS_KMALLOC;
-       }
 
        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);
-               if (dmi)
-                       *param_flags |= DM_PARAMS_VMALLOC;
        }
 
        if (!dmi) {
-- 
2.8.0.rc3