linux-kernel - [ 18/54] Staging: android: binder: Allow using highmem for binder buffers

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Message-Id: <20121029213804.797218970@linuxfoundation.org>
Date:	Mon, 29 Oct 2012 14:40:19 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Arve Hjønnevåg <arve@...roid.com>
Subject: [ 18/54] Staging: android: binder: Allow using highmem for binder buffers

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arve Hjønnevåg <arve@...roid.com>

commit 585650dcec88e704a19bb226a34b6a7166111623 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/android/binder.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -655,7 +655,7 @@ static int binder_update_page_range(stru
 		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) {
 			printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
 			       "for page at %p\n", proc->pid, page_addr);


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