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| author |   Roland McGrath <roland@gnu.org> | 2006-04-04 08:18:56 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 2006-04-04 08:18:56 +0000 |
| commit | f9d35bb91eea55bddcb604ec369ddab847d7ed5a (patch) | |
| tree | c78bac52709cbf238f88bb35a54ed40ec1081ee0 /nptl | |
| parent | [BZ #2508] (diff) | |
| download | glibc-f9d35bb91eea55bddcb604ec369ddab847d7ed5a.tar.gz glibc-f9d35bb91eea55bddcb604ec369ddab847d7ed5a.tar.bz2 glibc-f9d35bb91eea55bddcb604ec369ddab847d7ed5a.zip | |
[BZ #2505]
2006-04-03 Steven Munroe <sjmunroe@us.ibm.com>
[BZ #2505]
* sysdeps/powerpc/powerpc32/bits/atomic.h [_ARCH_PWR4]:
Define atomic_read_barrier and __ARCH_REL_INSTR using lwsync.
Diffstat (limited to 'nptl')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h index fcc1240fef..abd019df47 100644 --- a/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h +++ b/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h @@ -110,7 +110,21 @@ # define __lll_rel_instr "" #else # define __lll_acq_instr "isync" -# define __lll_rel_instr "sync" +# ifdef _ARCH_PWR4 +/* + * Newer powerpc64 processors support the new "light weight" sync (lwsync) + * So if the build is using -mcpu=[power4,power5,power5+,970] we can + * safely use lwsync. + */ +# define __lll_rel_instr "lwsync" +# else +/* + * Older powerpc32 processors don't support the new "light weight" + * sync (lwsync). So the only safe option is to use normal sync + * for all powerpc32 applications. + */ +# define __lll_rel_instr "sync" +# endif #endif /* Set *futex to ID if it is 0, atomically. Returns the old value */ |