linux-kernel - [PATCH 13/19] s390: get rid of superfluous __GFP

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Date:	Mon, 11 Apr 2016 13:08:06 +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>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-arch@...r.kernel.org
Subject: [PATCH 13/19] s390: get rid of superfluous __GFP_REPEAT

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

__GFP_REPEAT has a rather weak semantic but since it has been introduced
around 2.6.12 it has been ignored for low order allocations.

arch_dup_task_struct uses __GFP_REPEAT for fpu_regs_size which is either
sizeof(__vector128) * __NUM_VXRS = 4069B resp.
sizeof(freg_t) * __NUM_FPRS = 1024B AFAICS. page_table_alloc then uses
the flag for a single page allocation. This means that this flag has
never been actually useful here because it has always been used only for
PAGE_ALLOC_COSTLY requests.

Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Cornelia Huck <cornelia.huck@...ibm.com>
Cc: linux-arch@...r.kernel.org
Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 arch/s390/kernel/process.c | 2 +-
 arch/s390/mm/pgalloc.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index f8e79824e284..1837a1901d4b 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -102,7 +102,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 	 */
 	fpu_regs_size = MACHINE_HAS_VX ? sizeof(__vector128) * __NUM_VXRS
 				       : sizeof(freg_t) * __NUM_FPRS;
-	dst->thread.fpu.regs = kzalloc(fpu_regs_size, GFP_KERNEL|__GFP_REPEAT);
+	dst->thread.fpu.regs = kzalloc(fpu_regs_size, GFP_KERNEL);
 	if (!dst->thread.fpu.regs)
 		return -ENOMEM;
 
diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c
index f6c3de26cda8..3f716741797a 100644
--- a/arch/s390/mm/pgalloc.c
+++ b/arch/s390/mm/pgalloc.c
@@ -198,7 +198,7 @@ unsigned long *page_table_alloc(struct mm_struct *mm)
 			return table;
 	}
 	/* Allocate a fresh page */
-	page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
+	page = alloc_page(GFP_KERNEL);
 	if (!page)
 		return NULL;
 	if (!pgtable_page_ctor(page)) {
-- 
2.8.0.rc3