linux-kernel - [06/26] sh: Fix cached/uncaced address calculation in 29bit mode

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Date:	Fri, 18 Nov 2011 16:02:42 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: [06/26] sh: Fix cached/uncaced address calculation in 29bit mode

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>

commit dfd3b596fbbfa48b8e7966ef996d587157554b69 upstream.

In the case of 29bit mode, CAC/UNCAC_ADDR does not return a right address.
This revises this problem by using P1SEGADDR and P2SEGADDR in 29bit mode.

Reported-by: Yutaro Ebihara <ebiharaml@...linux.co.jp>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Tested-by: Simon Horman <horms@...ge.net.au>
Signed-off-by: Paul Mundt <lethal@...ux-sh.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/sh/include/asm/page.h |    5 +++++
 1 file changed, 5 insertions(+)

--- a/arch/sh/include/asm/page.h
+++ b/arch/sh/include/asm/page.h
@@ -141,8 +141,13 @@ typedef struct page *pgtable_t;
 #endif /* !__ASSEMBLY__ */
 
 #ifdef CONFIG_UNCACHED_MAPPING
+#if defined(CONFIG_29BIT)
+#define UNCAC_ADDR(addr)	P2SEGADDR(addr)
+#define CAC_ADDR(addr)		P1SEGADDR(addr)
+#else
 #define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + uncached_start)
 #define CAC_ADDR(addr)		((addr) - uncached_start + PAGE_OFFSET)
+#endif
 #else
 #define UNCAC_ADDR(addr)	((addr))
 #define CAC_ADDR(addr)		((addr))


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