ARM: io: fix ioremap_wt() implementation

ioremap_wt() was added by aliasing it to ioremap_nocache(), which is a
device mapping.  Device mappings do not allow unaligned accesses, but
it appears that GCC is able to inline its own memcpy() implementation
which may use such accesses.  The only user of this is pmem, which
uses memcpy() on the region.

Therefore, this is unsafe.  We must implement ioremap_wt() correctly
for ARM, or not at all.

This patch adds a more correct implementation by re-using ioremap_wc()
to provide a normal-memory non-cacheable mapping.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h
index ae10717f61d40a523940239552be9a0b0c1441ce..f1083ebf214dd1cda59d13a4afdc263b5b09748d 100644 (file)
--- a/arch/arm/include/asm/io.h
+++ b/arch/arm/include/asm/io.h
@@ -394,7 +394,7 @@ static inline void memcpy_toio(volatile void __iomem *to, const void *from,
 #define ioremap_nocache(cookie,size)   __arm_ioremap((cookie), (size), MT_DEVICE)
 #define ioremap_cache(cookie,size)     __arm_ioremap((cookie), (size), MT_DEVICE_CACHED)
 #define ioremap_wc(cookie,size)                __arm_ioremap((cookie), (size), MT_DEVICE_WC)
-#define ioremap_wt(cookie,size)                __arm_ioremap((cookie), (size), MT_DEVICE)
+#define ioremap_wt(cookie,size)                __arm_ioremap((cookie), (size), MT_DEVICE_WC)
 #define iounmap                                __arm_iounmap
 
 /*