Re: [PATCH] S/390: Port of lock elision to System/z

[Stefan Liebler <stli at linux dot vnet dot ibm dot com>]

Hi,

like mentioned in the discussion before, the clobbering of 
FPRs/cc/memory is not needed anymore. In an older patch-version, the 
transaction was either started by the builtin_tbegin or an asm("tbegin").
In the latter case, the clobbering of FPRs was needed.
There was also a non-transactional store, which is not needed anymore.
The objdumps of this patch-version with and without the clobbering does 
not differ.

The file nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_unlock.c is not 
added anymore, because it only includes the nptl/pthread_mutex_unlock.c.

Ok?

Bye

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2014-04-30  Dominik Vogt  <vogt@linux.vnet.ibm.com>
            Stefan Liebler  <stli@linux.vnet.ibm.com>

	* config.make.in (enable-lock-elision): New Makefile variable.
	* configure.ac: Likewise.
	* configure: Regenerate.
	* sysdeps/s390/configure.ac:
	Add check for gcc transactions support.
	* sysdeps/s390/configure: Regenerate.
	* nptl/sysdeps/unix/sysv/linux/s390/Makefile: New file.
	Build elision files if enabled.
	* nptl/sysdeps/unix/sysv/linux/s390/elision-conf.c: New file.
	Add lock elision support for s390.
	* nptl/sysdeps/unix/sysv/linux/s390/elision-conf.h: Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/elision-lock.c: Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/elision-timed.c: Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/elision-trylock.c: Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/elision-unlock.c: Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/force-elision.h: Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_cond_lock.c:
	Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_lock.c:
	Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_timedlock.c:
	Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/pthread_mutex_trylock.c:
	Likewise.
	* nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h:
	(__lll_timedlock_elision, __lll_lock_elision)
	(__lll_unlock_elision, __lll_trylock_elision)
	(lll_timedlock_elision, lll_lock_elision)
	(lll_unlock_elision, lll_trylock_elision): Add.
	* nptl/sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h
	(pthread_mutex_t): Add lock elision support for s390.
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