This is a note to let you know that I've just added the patch titled
mm: Fix memory size alignment in devm_memremap_pages_release()
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: mm-fix-memory-size-alignment-in-devm_memremap_pages_release.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 10a0cd6e4932b5078215b1ec2c896597eec0eff9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20H=2E=20Sch=C3=B6nherr?= jschoenh@amazon.de Date: Fri, 19 Jan 2018 16:27:54 -0800 Subject: mm: Fix memory size alignment in devm_memremap_pages_release() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
From: Jan H. Schönherr jschoenh@amazon.de
commit 10a0cd6e4932b5078215b1ec2c896597eec0eff9 upstream.
The functions devm_memremap_pages() and devm_memremap_pages_release() use different ways to calculate the section-aligned amount of memory. The latter function may use an incorrect size if the memory region is small but straddles a section border.
Use the same code for both.
Cc: stable@vger.kernel.org Fixes: 5f29a77cd957 ("mm: fix mixed zone detection in devm_memremap_pages") Signed-off-by: Jan H. Schönherr jschoenh@amazon.de Signed-off-by: Dan Williams dan.j.williams@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- kernel/memremap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -245,7 +245,8 @@ static void devm_memremap_pages_release(
/* pages are dead and unused, undo the arch mapping */ align_start = res->start & ~(SECTION_SIZE - 1); - align_size = ALIGN(resource_size(res), SECTION_SIZE); + align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE) + - align_start;
lock_device_hotplug(); mem_hotplug_begin();
Patches currently in stable-queue which might be from jschoenh@amazon.de are
queue-4.9/mm-fix-memory-size-alignment-in-devm_memremap_pages_release.patch