dm: use __GFP_HIGHMEM in __vmalloc

Use __GFP_HIGHMEM in __vmalloc.

Pages allocated with __vmalloc can be allocated in high memory that is not
directly mapped to kernel space, so use __GFP_HIGHMEM just like vmalloc
does. This patch reduces memory pressure slightly because pages can be
allocated in the high zone.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 0387e05..9588b86 100644 (file)
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -349,7 +349,7 @@ static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask,
        if (gfp_mask & __GFP_NORETRY)
                noio_flag = memalloc_noio_save();
 
-       ptr = __vmalloc(c->block_size, gfp_mask, PAGE_KERNEL);
+       ptr = __vmalloc(c->block_size, gfp_mask | __GFP_HIGHMEM, PAGE_KERNEL);
 
        if (gfp_mask & __GFP_NORETRY)
                memalloc_noio_restore(noio_flag);

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 81a79b7..12f0486 100644 (file)
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1646,7 +1646,7 @@ static int copy_params(struct dm_ioctl __user *user, struct dm_ioctl *param_kern
        if (!dmi) {
                unsigned noio_flag;
                noio_flag = memalloc_noio_save();
-               dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_REPEAT | __GFP_HIGH, PAGE_KERNEL);
+               dmi = __vmalloc(param_kernel->data_size, GFP_NOIO | __GFP_REPEAT | __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL);
                memalloc_noio_restore(noio_flag);
                if (dmi)
                        *param_flags |= DM_PARAMS_VMALLOC;