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arch: Cleanup read_barrier_depends() and comments

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This patch is meant to cleanup the handling of read_barrier_depends and
smp_read_barrier_depends.  In multiple spots in the kernel headers
read_barrier_depends is defined as "do {} while (0)", however we then go
into the SMP vs non-SMP sections and have the SMP version reference
read_barrier_depends, and the non-SMP define it as yet another empty
do/while.

With this commit I went through and cleaned out the duplicate definitions
and reduced the number of definitions down to 2 per header.  In addition I
moved the 50 line comments for the macro from the x86 and mips headers that
defined it as an empty do/while to those that were actually defining the
macro, alpha and blackfin.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck
2014-12-11 15:01:55 -08:00
committed by David S. Miller
parent c11a9009ae
commit 8a44971841
10 changed files with 129 additions and 135 deletions
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4
arch/sparc/include/asm/barrier_64.h
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@@ -37,7 +37,6 @@ do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
#define rmb() __asm__ __volatile__("":::"memory")
#define wmb() __asm__ __volatile__("":::"memory")
#define read_barrier_depends() do { } while(0)
#define set_mb(__var, __value) \
do { __var = __value; membar_safe("#StoreLoad"); } while(0)
@@ -51,7 +50,8 @@ do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
#define smp_wmb() __asm__ __volatile__("":::"memory")
#endif
#define smp_read_barrier_depends() do { } while(0)
#define read_barrier_depends() do { } while (0)
#define smp_read_barrier_depends() do { } while (0)
#define smp_store_release(p, v) \
do { \