linux-kernel - [PATCHv2 1/2] fs/pstore: Use memcpy

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Date:	Mon, 15 Feb 2016 09:19:48 +0100
From:	Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:	linux-kernel@...r.kernel.org
Cc:	Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>,
	Furquan Shaikh <furquan@...gle.com>,
	Aaron Durbin <adurbin@...omium.org>,
	Olof Johansson <olofj@...omium.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Puneet Kumar <puneetster@...omium.org>,
	tomeu.vizoso@...labora.co.uk, gustavo.padovan@...labora.co.uk,
	emilio.lopez@...labora.co.uk, sjoerd.simons@...labora.co.uk,
	Enric Balletbo Serra <enric.balletbo@...labora.com>
Subject: [PATCHv2 1/2] fs/pstore: Use memcpy_toio instead of memcpy

From: Furquan Shaikh <furquan@...gle.com>

persistent_ram_update uses vmap / iomap based on whether the buffer is in
memory region or reserved region. However, both map it as non-cacheable
memory. For armv8 specifically, non-cacheable mapping requests use a
memory type that has to be accessed aligned to the request size. memcpy()
doesn't guarantee that.

Signed-off-by: Furquan Shaikh <furquan@...gle.com>
Signed-off-by: Enric Balletbo Serra <enric.balletbo@...labora.com>
Reviewed-by: Aaron Durbin <adurbin@...omium.org>
Reviewed-by: Olof Johansson <olofj@...omium.org>
Tested-by: Furquan Shaikh <furquan@...omium.org>
Acked-by: Kees Cook <keescook@...omium.org>
---
 fs/pstore/ram_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 76c3f80..351164d 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -299,7 +299,7 @@ static void notrace persistent_ram_update(struct persistent_ram_zone *prz,
 	const void *s, unsigned int start, unsigned int count)
 {
 	struct persistent_ram_buffer *buffer = prz->buffer;
-	memcpy(buffer->data + start, s, count);
+	memcpy_toio(buffer->data + start, s, count);
 	persistent_ram_update_ecc(prz, start, count);
 }
 
-- 
2.1.0