linux-kernel - [PATCH] [222/275] shmem: let shared anonymous be nonlinear again

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Message-Id: <20110330210747.6F2C23E1A05@tassilo.jf.intel.com>
Date:	Wed, 30 Mar 2011 14:07:47 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	hughd@...gle.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [222/275] shmem: let shared anonymous be nonlinear again

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Hugh Dickins <hughd@...gle.com>

commit bee4c36a5cf5c9f63ce1d7372aa62045fbd16d47 upstream.

Up to 2.6.22, you could use remap_file_pages(2) on a tmpfs file or a
shared mapping of /dev/zero or a shared anonymous mapping.  In 2.6.23 we
disabled it by default, but set VM_CAN_NONLINEAR to enable it on safe
mappings.  We made sure to set it in shmem_mmap() for tmpfs files, but
missed it in shmem_zero_setup() for the others.  Fix that at last.

Reported-by: Kenny Simpson <theonetruekenny@...oo.com>
Signed-off-by: Hugh Dickins <hughd@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 mm/shmem.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux-2.6.35.y/mm/shmem.c
===================================================================
--- linux-2.6.35.y.orig/mm/shmem.c	2011-03-29 22:50:27.900544514 -0700
+++ linux-2.6.35.y/mm/shmem.c	2011-03-29 23:03:02.862226932 -0700
@@ -2756,5 +2756,6 @@
 		fput(vma->vm_file);
 	vma->vm_file = file;
 	vma->vm_ops = &shmem_vm_ops;
+	vma->vm_flags |= VM_CAN_NONLINEAR;
 	return 0;
 }
--
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