[PATCH] PPC lll_mutex_unlock_force write barrier
Steven Munroe <[email protected]>
| Newsgroups | gmane.comp.lib.phil |
|---|---|
| Organization | IBM Linux Developement |
| Message-ID | <[email protected]> |
For Power4 and future processors with long store queues and out of order execution, lll_mutex_unlock_force needs a write barrier between the store and the futex syscall. 2003-08-26 Steven Munroe <[email protected]> * sysdeps/unix/sysv/linux/powerpc/lowlevellock.h [lll_mutex_unlock_force]: Add memory barrier between store and futex syscall. -- Steven Munroe [email protected] Linux on PowerPC-64 Development GLIBC for PowerPC-64 Development
ppc-nptl-lll-20030825.patch
(text/plain, 607 B)
diff -urN libc23-ppc64nptl-20030825/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h libc23/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
--- libc23-ppc64nptl-20030825/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h 2003-06-19 14:39:28.000000000 -0500
+++ libc23/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h 2003-08-11 11:15:32.000000000 -0500
@@ -148,6 +148,7 @@
((void) ({ \
int *__futex = &(lock); \
*__futex = 0; \
+ __asm __volatile (__lll_rel_instr ::: "memory"); \
lll_futex_wake (__futex, 1); \
}))