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| author | Paul E. Murphy <murphyp@linux.vnet.ibm.com> | 2015-08-13 16:21:05 -0500 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com> | 2015-08-26 14:55:33 -0300 |
| commit | 6eb901de9b8c3a582ec2a5fc9a2223f326800812 (patch) | |
| tree | 586fda1b68d22937717b6c9c2c57311c69aac302 | |
| parent | a2ab38c9b8a8b99f998bb9b9743b3f5c9a4493b5 (diff) | |
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powerpc: Revert to default atomic ops in elision code
Power ISA 2.07B section B.5.5 relaxed the barrier requirement around a
TLE enabled lock. It is now identical to a traditional lock.
2015-08-26 Paul E. Murphy <murphyp@linux.vnet.ibm.com>
* sysdeps/unix/sysv/linux/powerpc/elision-lock.c
(__arch_compare_and_exchange_val_32_acq): Remove and use common
definition. ISA 2.07B no longer requires full sync.
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/elision-lock.c | 21 |
2 files changed, 6 insertions, 21 deletions
@@ -1,3 +1,9 @@ +2015-08-26 Paul E. Murphy <murphyp@linux.vnet.ibm.com> + + * sysdeps/unix/sysv/linux/powerpc/elision-lock.c + (__arch_compare_and_exchange_val_32_acq): Remove and use common + definition. ISA 2.07B no longer requires full sync. + 2015-08-26 Mike Frysinger <vapier@gentoo.org> [BZ #18863] diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-lock.c b/sysdeps/unix/sysv/linux/powerpc/elision-lock.c index 7f9bcc2bf1..26d272e619 100644 --- a/sysdeps/unix/sysv/linux/powerpc/elision-lock.c +++ b/sysdeps/unix/sysv/linux/powerpc/elision-lock.c @@ -23,27 +23,6 @@ #include <elision-conf.h> #include "htm.h" -/* PowerISA 2.0.7 Section B.5.5 defines isync to be insufficient as a - barrier in acquire mechanism for HTM operations, a strong 'sync' is - required. */ -#undef __arch_compare_and_exchange_val_32_acq -#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \ - ({ \ - __typeof (*(mem)) __tmp; \ - __typeof (mem) __memp = (mem); \ - __asm __volatile ( \ - "1: lwarx %0,0,%1" MUTEX_HINT_ACQ "\n" \ - " cmpw %0,%2\n" \ - " bne 2f\n" \ - " stwcx. %3,0,%1\n" \ - " bne- 1b\n" \ - "2: sync" \ - : "=&r" (__tmp) \ - : "b" (__memp), "r" (oldval), "r" (newval) \ - : "cr0", "memory"); \ - __tmp; \ - }) - #if !defined(LLL_LOCK) && !defined(EXTRAARG) /* Make sure the configuration code is always linked in for static libraries. */ |