linux-kernel - [PATCH 17/19] dm: get rid of superfluous gfp flags

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Message-Id: <1460372892-8157-18-git-send-email-mhocko@kernel.org>
Date:	Mon, 11 Apr 2016 13:08:10 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	<linux-mm@...ck.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.com>, Shaohua Li <shli@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: [PATCH 17/19] dm: get rid of superfluous gfp flags

From: Michal Hocko <mhocko@...e.com>

copy_params seems to be little bit confused about which allocation flags
to use. It enforces GFP_NOIO even though it uses
memalloc_noio_{save,restore} which enforces GFP_NOIO at the page
allocator level automatically (via memalloc_noio_flags). It also
uses __GFP_REPEAT for the __vmalloc request which doesn't make much
sense either because vmalloc doesn't rely on costly high order
allocations.

Cc: Shaohua Li <shli@...nel.org>
Cc: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 drivers/md/dm-ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 2adf81d81fca..dfe629a294e1 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1723,7 +1723,7 @@ 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 | __GFP_HIGHMEM, PAGE_KERNEL);
+		dmi = __vmalloc(param_kernel->data_size, __GFP_HIGH | __GFP_HIGHMEM, PAGE_KERNEL);
 		memalloc_noio_restore(noio_flag);
 		if (dmi)
 			*param_flags |= DM_PARAMS_VMALLOC;
-- 
2.8.0.rc3