From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heiko Carstens Date: Sat, 30 Sep 2017 10:38:55 +0000 Subject: Re: [PATCH REBASED 3/6] s390: Add __down_read_killable() Message-Id: <20170930103855.GA9309@osiris> List-Id: References: <150670038738.23930.7190484711222807884.stgit@localhost.localdomain> <150670117817.23930.13068785028558453848.stgit@localhost.localdomain> <20170930092002.GA4623@osiris> <20170930123612.0fb250fe@mschwideX1> In-Reply-To: <20170930123612.0fb250fe@mschwideX1> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: Martin Schwidefsky Cc: Kirill Tkhai , linux-ia64@vger.kernel.org, avagin@virtuozzo.com, peterz@infradead.org, hpa@zytor.com, gorcunov@virtuozzo.com, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org, mingo@redhat.com, mattst88@gmail.com, fenghua.yu@intel.com, arnd@arndb.de, ink@jurassic.park.msu.ru, tglx@linutronix.de, rth@twiddle.net, tony.luck@intel.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, davem@davemloft.net, rientjes@google.com, viro@zeniv.linux.org.uk On Sat, Sep 30, 2017 at 12:36:12PM +0200, Martin Schwidefsky wrote: > On Sat, 30 Sep 2017 11:20:02 +0200 > Heiko Carstens wrote: >=20 > > On Fri, Sep 29, 2017 at 07:06:18PM +0300, Kirill Tkhai wrote: > > > Similar to __down_write_killable(), and read killable primitive. > > >=20 > > > Signed-off-by: Kirill Tkhai > > > --- > > > arch/s390/include/asm/rwsem.h | 18 ++++++++++++++++-- > > > 1 file changed, 16 insertions(+), 2 deletions(-) > > >=20 > > > diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rw= sem.h =20 > >=20 > > FWIW, while looking into this patch I realized that we never optimized = our > > rwsem primitives to make use of new atomic instructions. > >=20 > > The generic rwsem header file however does, since it uses atomic ops wh= ich > > we did optimize. Even when compiling for old machines the generic versi= on > > generates better code. Therefore I will remove the 15 years old s390 > > implementation and switch to the generic version instead. >=20 > Take care not to conflict with the queued spinlock/rwlock patches on the > features branch.=20 >=20 > https://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git/commit/?h= =FEatures&id=EB3b7b848fb3dd00f7a57d633d4ae4d194aa7865 >=20 > Me thinks that what you have in mind is already done. No, it's not done. You probably mixed up rwlocks and rwsems?