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| author | attilio <attilio@FreeBSD.org> | 2012-10-09 14:32:30 +0000 |
|---|---|---|
| committer | attilio <attilio@FreeBSD.org> | 2012-10-09 14:32:30 +0000 |
| commit | 6997194551ffae05d71ea650af49c4551d753a1a (patch) | |
| tree | 18e9f31a3018a88b46e78d76a45d0953dea5276b /sys/pc98 | |
| parent | 6a02d06d1d81ffda0499310925ef854fd237f382 (diff) | |
| download | FreeBSD-src-6997194551ffae05d71ea650af49c4551d753a1a.zip FreeBSD-src-6997194551ffae05d71ea650af49c4551d753a1a.tar.gz | |
Add an unified macro to deny ability from the compiler to reorder
instruction loads/stores at its will.
The macro __compiler_membar() is currently supported for both gcc and
clang, but kernel compilation will fail otherwise.
Reviewed by: bde, kib
Discussed with: dim, theraven
MFC after: 2 weeks
Diffstat (limited to 'sys/pc98')
| -rw-r--r-- | sys/pc98/include/bus.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/pc98/include/bus.h b/sys/pc98/include/bus.h index 69e80f0..46d1a1b 100644 --- a/sys/pc98/include/bus.h +++ b/sys/pc98/include/bus.h @@ -593,7 +593,7 @@ bus_space_barrier(bus_space_tag_t tag, bus_space_handle_t bsh, if (flags & BUS_SPACE_BARRIER_READ) __asm __volatile("lock; addl $0,0(%%esp)" : : : "memory"); else - __asm __volatile("" : : : "memory"); + __compiler_membar(); } #ifdef BUS_SPACE_NO_LEGACY |
