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[RFC,06/20] x86: io: Remove useless definition of mmiowb()

Message ID 20190222185026.10973-7-will.deacon@arm.com
State Superseded
Headers show
Series Remove Mysterious Macro Intended to Obscure Weird Behaviours (mmiowb()) | expand

Commit Message

Will Deacon Feb. 22, 2019, 6:50 p.m. UTC 
x86 maps mmiowb() to barrier(), but this is superfluous because a
compiler barrier is already implied by spin_unlock(). Since x86 also
includes asm-generic/io.h in its asm/io.h file, we can remove the
definition entirely and pick up the dummy definition from core code.

Signed-off-by: Will Deacon <will.deacon@arm.com>

---
 arch/x86/include/asm/io.h | 2 --
 1 file changed, 2 deletions(-)

-- 
2.11.0
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Patch

diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 686247db3106..a06a9f8294ea 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -90,8 +90,6 @@  build_mmio_write(__writel, "l", unsigned int, "r", )
 #define __raw_writew __writew
 #define __raw_writel __writel
 
-#define mmiowb() barrier()
-
 #ifdef CONFIG_X86_64
 
 build_mmio_read(readq, "q", u64, "=r", :"memory")