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| author | Alexander Duyck <alexander.h.duyck@redhat.com> | 2014-12-11 15:01:55 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-12-11 21:15:05 -0500 |
| commit | 8a449718414ff10b9d5559ed3e8e09c7178774f2 (patch) | |
| tree | 81097c0d6949fb90e40176ddff1f4be30467b576 /arch/x86/um | |
| parent | c11a9009ae6a8c42a8cd69d885601e1aa6fbea04 (diff) | |
| download | linux-8a449718414ff10b9d5559ed3e8e09c7178774f2.tar.gz linux-8a449718414ff10b9d5559ed3e8e09c7178774f2.tar.bz2 linux-8a449718414ff10b9d5559ed3e8e09c7178774f2.zip | |
arch: Cleanup read_barrier_depends() and comments
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>
Diffstat (limited to 'arch/x86/um')
| -rw-r--r-- | arch/x86/um/asm/barrier.h | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/x86/um/asm/barrier.h b/arch/x86/um/asm/barrier.h index cc04e67bfd05..d6511d954e2b 100644 --- a/arch/x86/um/asm/barrier.h +++ b/arch/x86/um/asm/barrier.h @@ -29,8 +29,6 @@ #endif /* CONFIG_X86_32 */ -#define read_barrier_depends() do { } while (0) - #ifdef CONFIG_SMP #define smp_mb() mb() @@ -42,7 +40,6 @@ #define smp_wmb() barrier() -#define smp_read_barrier_depends() read_barrier_depends() #define set_mb(var, value) do { (void)xchg(&var, value); } while (0) #else /* CONFIG_SMP */ @@ -50,11 +47,13 @@ #define smp_mb() barrier() #define smp_rmb() barrier() #define smp_wmb() barrier() -#define smp_read_barrier_depends() do { } while (0) #define set_mb(var, value) do { var = value; barrier(); } while (0) #endif /* CONFIG_SMP */ +#define read_barrier_depends() do { } while (0) +#define smp_read_barrier_depends() do { } while (0) + /* * Stop RDTSC speculation. This is needed when you need to use RDTSC * (or get_cycles or vread that possibly accesses the TSC) in a defined |