Patch "pstore/ram: Use memcpy_fromio() to save old buffer" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

pstore/ram: Use memcpy_fromio() to save old buffer

to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
pstore-ram-use-memcpy_fromio-to-save-old-buffer.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andrew Bresticker <[email protected]>
Date: Mon, 15 Feb 2016 09:19:49 +0100
Subject: pstore/ram: Use memcpy_fromio() to save old buffer

From: Andrew Bresticker <[email protected]>

commit d771fdf94180de2bd811ac90cba75f0f346abf8d upstream.

The ramoops buffer may be mapped as either I/O memory or uncached memory. On ARM64, this results in a device-type (strongly-ordered) mapping. Since unnaligned accesses to device-type memory will generate an alignment fault (regardless of whether or not strict alignment checking is enabled), it is not safe to use memcpy(). memcpy_fromio() is guaranteed to only use aligned accesses, so use that instead.

---
 fs/pstore/ram_core.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -286,8 +286,8 @@ void persistent_ram_save_old(struct pers
 	}
 
 	prz->old_log_size = size;
-	memcpy(prz->old_log, &buffer->data[start], size - start);
-	memcpy(prz->old_log + size - start, &buffer->data[0], start);
+	memcpy_fromio(prz->old_log, &buffer->data[start], size - start);
+	memcpy_fromio(prz->old_log + size - start, &buffer->data[0], start);
 }
 
 int notrace persistent_ram_write(struct persistent_ram_zone *prz,

Patches currently in stable-queue which might be from [email protected] are

queue-4.8/pstore-ram-use-memcpy_fromio-to-save-old-buffer.patch