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arch: Clean up asm/barrier.h implementations using asm-generic/barrier.h
We're going to be adding a few new barrier primitives, and in order to avoid endless duplication make more agressive use of asm-generic/barrier.h. Change the asm-generic/barrier.h such that it allows partial barrier definitions and fills out the rest with defaults. There are a few architectures (m32r, m68k) that could probably do away with their barrier.h file entirely but are kept for now due to their unconventional nop() implementation. Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Michael Ellerman <michael@ellerman.id.au> Cc: Michael Neuling <mikey@neuling.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Victor Kaplansky <VICTORK@il.ibm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20131213150640.846368594@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Peter Zijlstra
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Ingo Molnar
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Jan 12, 2014
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Original file line number | Diff line number | Diff line change |
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@@ -47,3 +47,4 @@ generic-y += user.h | |
generic-y += vga.h | ||
generic-y += xor.h | ||
generic-y += preempt.h | ||
generic-y += barrier.h |
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Original file line number | Diff line number | Diff line change |
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@@ -12,3 +12,4 @@ generic-y += trace_clock.h | |
generic-y += vga.h | ||
generic-y += xor.h | ||
generic-y += preempt.h | ||
generic-y += barrier.h |
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Original file line number | Diff line number | Diff line change |
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@@ -1,20 +1,8 @@ | ||
#ifndef _M68K_BARRIER_H | ||
#define _M68K_BARRIER_H | ||
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/* | ||
* Force strict CPU ordering. | ||
* Not really required on m68k... | ||
*/ | ||
#define nop() do { asm volatile ("nop"); barrier(); } while (0) | ||
#define mb() barrier() | ||
#define rmb() barrier() | ||
#define wmb() barrier() | ||
#define read_barrier_depends() ((void)0) | ||
#define set_mb(var, value) ({ (var) = (value); wmb(); }) | ||
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#define smp_mb() barrier() | ||
#define smp_rmb() barrier() | ||
#define smp_wmb() barrier() | ||
#define smp_read_barrier_depends() ((void)0) | ||
#include <asm-generic/barrier.h> | ||
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#endif /* _M68K_BARRIER_H */ |
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Original file line number | Diff line number | Diff line change |
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@@ -5,3 +5,4 @@ generic-y += clkdev.h | |
generic-y += trace_clock.h | ||
generic-y += xor.h | ||
generic-y += preempt.h | ||
generic-y += barrier.h |
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