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[PATCH 15/20] tile: get rid of superfluous __GFP_REPEAT

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  [PATCH 15/20] tile: get rid of superfluous __GFP_REPEAT Michal Hocko <mhocko@kernel.org> - 2016-04-28 15:30 +0200
    Re: [PATCH 15/20] tile: get rid of superfluous __GFP_REPEAT Chris Metcalf <cmetcalf@mellanox.com> - 2016-04-28 18:30 +0200

#1390163 — [PATCH 15/20] tile: get rid of superfluous __GFP_REPEAT

From: Michal Hocko <mhocko@suse.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.

pgtable_alloc_one uses __GFP_REPEAT flag for L2_USER_PGTABLE_ORDER but
the order is either 0 or 3 if L2_KERNEL_PGTABLE_SHIFT for HPAGE_SHIFT.
This means that this flag has never been actually useful here because it
has always been used only for PAGE_ALLOC_COSTLY requests.

Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: linux-arch@vger.kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
---
 arch/tile/mm/pgtable.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index 7bf2491a9c1f..c4d5bf841a7f 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -231,7 +231,7 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 struct page *pgtable_alloc_one(struct mm_struct *mm, unsigned long address,
 			       int order)
 {
-	gfp_t flags = GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO;
+	gfp_t flags = GFP_KERNEL|__GFP_ZERO;
 	struct page *p;
 	int i;
 
-- 
2.8.0.rc3

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#1390374

On 4/28/2016 9:24 AM, Michal Hocko wrote:
> From: Michal Hocko<mhocko@suse.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.
>
> pgtable_alloc_one uses __GFP_REPEAT flag for L2_USER_PGTABLE_ORDER but
> the order is either 0 or 3 if L2_KERNEL_PGTABLE_SHIFT for HPAGE_SHIFT.
> This means that this flag has never been actually useful here because it
> has always been used only for PAGE_ALLOC_COSTLY requests.
>
> Cc: Chris Metcalf<cmetcalf@mellanox.com>
> Cc:linux-arch@vger.kernel.org
> Signed-off-by: Michal Hocko<mhocko@suse.com>
> ---
>   arch/tile/mm/pgtable.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

This seems OK as far as I can tell from code review.

Acked-by: Chris Metcalf <cmetcalf@mellanox.com> [for tile]

-- 
Chris Metcalf, Mellanox Technologies
http://www.mellanox.com

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