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authorArnd Bergmann <arnd@arndb.de>2014-11-11 21:55:45 +0300
committerArnd Bergmann <arnd@arndb.de>2014-11-11 21:55:45 +0300
commit1c8d29696f0d79902962526d6c54ebfeb842c61d (patch)
tree047caddef4ee91e42002bc1234d273c6fbc54967 /include/asm-generic/io.h
parent3ba5acf368ae415cd14d026b7cfe29de942b65fc (diff)
parenta8e0aead70b4af957e6b27b82fba849c6179b707 (diff)
downloadlinux-1c8d29696f0d79902962526d6c54ebfeb842c61d.tar.xz
Merge branch 'io' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into asm-generic
* 'io' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux: documentation: memory-barriers: clarify relaxed io accessor semantics x86: io: implement dummy relaxed accessor macros for writes tile: io: implement dummy relaxed accessor macros for writes sparc: io: implement dummy relaxed accessor macros for writes powerpc: io: implement dummy relaxed accessor macros for writes parisc: io: implement dummy relaxed accessor macros for writes mn10300: io: implement dummy relaxed accessor macros for writes m68k: io: implement dummy relaxed accessor macros for writes m32r: io: implement dummy relaxed accessor macros for writes ia64: io: implement dummy relaxed accessor macros for writes cris: io: implement dummy relaxed accessor macros for writes frv: io: implement dummy relaxed accessor macros for writes xtensa: io: remove dummy relaxed accessor macros for reads s390: io: remove dummy relaxed accessor macros for reads microblaze: io: remove dummy relaxed accessor macros asm-generic: io: implement relaxed accessor macros as conditional wrappers Conflicts: include/asm-generic/io.h Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/asm-generic/io.h')
-rw-r--r--include/asm-generic/io.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 00483d769d86..9db042304df3 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -175,6 +175,43 @@ static inline void writeq(u64 value, volatile void __iomem *addr)
#endif /* CONFIG_64BIT */
/*
+ * {read,write}{b,w,l,q}_relaxed() are like the regular version, but
+ * are not guaranteed to provide ordering against spinlocks or memory
+ * accesses.
+ */
+#ifndef readb_relaxed
+#define readb_relaxed readb
+#endif
+
+#ifndef readw_relaxed
+#define readw_relaxed readw
+#endif
+
+#ifndef readl_relaxed
+#define readl_relaxed readl
+#endif
+
+#ifndef readq_relaxed
+#define readq_relaxed readq
+#endif
+
+#ifndef writeb_relaxed
+#define writeb_relaxed writeb
+#endif
+
+#ifndef writew_relaxed
+#define writew_relaxed writew
+#endif
+
+#ifndef writel_relaxed
+#define writel_relaxed writel
+#endif
+
+#ifndef writeq_relaxed
+#define writeq_relaxed writeq
+#endif
+
+/*
* {read,write}s{b,w,l,q}() repeatedly access the same memory address in
* native endianness in 8-, 16-, 32- or 64-bit chunks (@count times).
*/