Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754175AbaGGOfZ (ORCPT ); Mon, 7 Jul 2014 10:35:25 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:59474 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753525AbaGGOfX (ORCPT ); Mon, 7 Jul 2014 10:35:23 -0400 Date: Mon, 7 Jul 2014 16:35:03 +0200 From: Peter Zijlstra To: Paolo Bonzini Cc: Waiman.Long@hp.com, tglx@linutronix.de, mingo@kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, paolo.bonzini@gmail.com, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, paulmck@linux.vnet.ibm.com, riel@redhat.com, torvalds@linux-foundation.org, raghavendra.kt@linux.vnet.ibm.com, david.vrabel@citrix.com, oleg@redhat.com, gleb@redhat.com, scott.norton@hp.com, chegu_vinod@hp.com Subject: Re: [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS Message-ID: <20140707143503.GS6758@twins.programming.kicks-ass.net> References: <20140615124657.264658593@chello.nl> <20140615130153.483502389@chello.nl> <53A17A88.7090705@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="GWLvvOwKrQC9aCO6" Content-Disposition: inline In-Reply-To: <53A17A88.7090705@redhat.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --GWLvvOwKrQC9aCO6 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jun 18, 2014 at 01:39:52PM +0200, Paolo Bonzini wrote: > Il 15/06/2014 14:47, Peter Zijlstra ha scritto: > > > >- for (;;) { > >- new =3D (val & ~_Q_PENDING_MASK) | _Q_LOCKED_VAL; > >- > >- old =3D atomic_cmpxchg(&lock->val, val, new); > >- if (old =3D=3D val) > >- break; > >- > >- val =3D old; > >- } > >+ clear_pending_set_locked(lock, val); > > return; >=20 >=20 > Might as well add clear_pending_set_locked already in patch 3. Patch 4, if anywhere. --GWLvvOwKrQC9aCO6 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJTurAXAAoJEHZH4aRLwOS6tJMP/2/ejA34BXi0AUQBXy9sqoLV 4RvzSDvwtOwzPXS+41vrujUL9TcW0ehExmCWzDM7SRveQgpUL1UO4JezQTxI5bFd H8W92MkEjieElMiywUCD74tAjyR5VRhISbFsKfyTI936xHxp+3EsML/uak1jEye+ Oq2qeDt5Z3s2UuGwAAEElaIJVjgpDqGoid98oWTAKn18P4Tf5aPXta2D75hPsaSE teGnn18YtOZNsK3Poup+ILMcCzaxRz+ywXNgMSu+F37X3RRs1tU9v3yCvHMyXvW1 3VY7vLwwnuw0ZC8cyYqlPAx97Y/SO/Dufr1zRFxVXzj9onVQrB1JGqcX9w/S17+u UpWCwGT59wCqzk6LlEXiKvMEsnHajpyO2pPHgc/QZWEY6B2zqUhq4KDEgSu7oGfa Z9Mr6QUzhgb1ZZRnhzMjgX5ma/7TLkh5l3FykNpi/A3EY/u+Ix59Q79rU8eDza8Q h4Hbn37SiWW+GZCCf8SruSuA5kA+tizzp+vlHY/mBOFdq1G+FN/AkcZuhgZnSxS+ 4nM5+AjEihrDobaJ5qBU0TN3s9j22n0J7TCCQGKZ3fvZ00Op3VRl0IOiL7XSG463 XkvJULht9ksfz2C1+uoTs1KSaoZKu8G7VdMORXntN7Os4kA8+hznTQzK3rzv9GAZ bEuwTxenzLrQ7GrSFUpP =6YZk -----END PGP SIGNATURE----- --GWLvvOwKrQC9aCO6-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/