linux-kernel - [PATCH 4/4] Staging: android: binder: Allow using highmem for binder buffers

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Message-Id: <1350426595-18059-4-git-send-email-arve@android.com>
Date:	Tue, 16 Oct 2012 15:29:55 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	gregkh@...uxfoundation.org
Cc:	xiaobing.tu@...el.com, ccross@...roid.com, davej@...hat.com,
	akpm@...ux-foundation.org, mingo@...e.hu, rusty@...tcorp.com.au,
	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, di.zhang@...el.com, xindong.ma@...el.com,
	alex.zuo@...el.com,
	Arve Hjønnevåg <arve@...roid.com>
Subject: [PATCH 4/4] Staging: android: binder: Allow using highmem for binder buffers

The default kernel mapping for the pages allocated for the binder
buffers is never used. Set the __GFP_HIGHMEM flag when allocating
these pages so we don't needlessly use low memory pages that may
be required elsewhere.

Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
---
 drivers/staging/android/binder.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index 91ce956..9fbc06e 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -583,7 +583,7 @@ static int binder_update_page_range(struct binder_proc *proc, int allocate,
 		page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 
 		BUG_ON(*page);
-		*page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+		*page = alloc_page(GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
 		if (*page == NULL) {
 			pr_err("binder: %d: binder_alloc_buf failed "
 			       "for page at %p\n", proc->pid, page_addr);
-- 
1.7.7.3

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