On Sat, 30 Sep 2017 11:20:02 +0200
Heiko Carstens [off-list ref] wrote:

On Fri, Sep 29, 2017 at 07:06:18PM +0300, Kirill Tkhai wrote:

quoted

Similar to __down_write_killable(), and read killable primitive.

Signed-off-by: Kirill Tkhai <redacted>
---
 arch/s390/include/asm/rwsem.h |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h  

FWIW, while looking into this patch I realized that we never optimized our
rwsem primitives to make use of new atomic instructions.

The generic rwsem header file however does, since it uses atomic ops which
we did optimize. Even when compiling for old machines the generic version
generates better code. Therefore I will remove the 15 years old s390
implementation and switch to the generic version instead.

Take care not to conflict with the queued spinlock/rwlock patches on the
features branch. 

https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h=features&id=eb3b7b848fb3dd00f7a57d633d4ae4d194aa7865

Me thinks that what you have in mind is already done.

-- 
blue skies,
   Martin.

"Reality continues to ruin my life." - Calvin.