linux-kernel - [PATCH] pstore: Use memcpy

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Message-Id: <1415902158-18769-1-git-send-email-furquan@google.com>
Date:	Thu, 13 Nov 2014 10:09:18 -0800
From:	Furquan Shaikh <furquan@...gle.com>
To:	Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>
Cc:	linux-kernel@...r.kernel.org, olofj@...gle.com, adurbin@...gle.com,
	Furquan Shaikh <furquan@...gle.com>
Subject: [PATCH] pstore: Use memcpy_toio instead of memcpy

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>
---
 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 9d7b9a8..cfbc5e4 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.rc2.206.gedb03e5

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