[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <56982972.7050609@imgtec.com>
Date: Thu, 14 Jan 2016 15:04:18 -0800
From: Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To: <paulmck@...ux.vnet.ibm.com>
CC: Peter Zijlstra <peterz@...radead.org>,
Will Deacon <will.deacon@....com>,
"Michael S. Tsirkin" <mst@...hat.com>,
<linux-kernel@...r.kernel.org>, "Arnd Bergmann" <arnd@...db.de>,
<linux-arch@...r.kernel.org>,
Andrew Cooper <andrew.cooper3@...rix.com>,
Russell King - ARM Linux <linux@....linux.org.uk>,
<virtualization@...ts.linux-foundation.org>,
Stefano Stabellini <stefano.stabellini@...citrix.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Joe Perches <joe@...ches.com>,
David Miller <davem@...emloft.net>,
<linux-ia64@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
<linux-s390@...r.kernel.org>, <sparclinux@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-metag@...r.kernel.org>, <linux-mips@...ux-mips.org>,
<x86@...nel.org>, <user-mode-linux-devel@...ts.sourceforge.net>,
<adi-buildroot-devel@...ts.sourceforge.net>,
<linux-sh@...r.kernel.org>, <linux-xtensa@...ux-xtensa.org>,
<xen-devel@...ts.xenproject.org>,
"Ralf Baechle" <ralf@...ux-mips.org>,
Ingo Molnar <mingo@...nel.org>, <ddaney.cavm@...il.com>,
<james.hogan@...tec.com>, Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [v3,11/41] mips: reuse asm-generic/barrier.h
On 01/14/2016 02:24 PM, Paul E. McKenney wrote:
> Actually, the Linux kernel doesn't have an acquire barrier, just an
> smp_load_acquire(). Or did someone sneak one in while I wasn't looking?
That was an exactly starting point for this discussion. This patch just
pulls out from MIPS files smp_load_acquire() and smp_store_release().
However, I put into LMO half year ago the patch
http://patchwork.linux-mips.org/patch/10506/ which replaces a generic
smp_mb with MIPS specific smp_release/acquire in that functions. This
patch also fixes use of SYNCs barriers in spin_locks/atomics/bitops for
Imagination MIPS CPUs too - it is just absent now for any Imagination
MIPS CPUs!
Michael later pointed me that it can be returned back with his series of
patches but discussion was already here.
- Leonid.
Powered by blists - more mailing lists