From: Borislav Petkov <bp@alien8.de>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@amacapital.net>,
Andy Lutomirski <luto@kernel.org>,
Davidlohr Bueso <dave@stgolabs.net>,
Davidlohr Bueso <dbueso@suse.de>,
Peter Zijlstra <peterz@infradead.org>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
virtualization <virtualization@lists.linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH 3/4] x86,asm: Re-work smp_store_mb()
Date: Wed, 13 Jan 2016 17:53:20 +0100 [thread overview]
Message-ID: <20160113165319.GJ12897@pd.tnic> (raw)
In-Reply-To: <20160113184003-mutt-send-email-mst@redhat.com>
On Wed, Jan 13, 2016 at 06:42:48PM +0200, Michael S. Tsirkin wrote:
> Oh, I think this means we need a "cc" clobber.
Btw, does your microbenchmark do it too?
Because, the "cc" clobber should cause additional handling of flags,
depending on the context. It won't matter if the context doesn't need
rFLAGS handling in the benchmark but if we start using LOCK; ADD in the
kernel, I can imagine some places where mb() is used and rFLAGS are
live, causing gcc to either reorder code or stash them away...
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
next prev parent reply other threads:[~2016-01-13 16:53 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-27 19:53 [PATCH -tip 0/4] A few updates around smp_store_mb() Davidlohr Bueso
2015-10-27 19:53 ` [PATCH 1/4] arch,cmpxchg: Remove tas() definitions Davidlohr Bueso
2015-12-04 12:01 ` [tip:locking/core] locking/cmpxchg, arch: " tip-bot for Davidlohr Bueso
2015-10-27 19:53 ` [PATCH 2/4] arch,barrier: Use smp barriers in smp_store_release() Davidlohr Bueso
2015-10-27 20:03 ` Davidlohr Bueso
2015-12-04 12:01 ` [tip:locking/core] lcoking/barriers, arch: " tip-bot for Davidlohr Bueso
2015-10-27 19:53 ` [PATCH 3/4] x86,asm: Re-work smp_store_mb() Davidlohr Bueso
2015-10-27 21:33 ` Linus Torvalds
2015-10-27 22:01 ` Davidlohr Bueso
2015-10-27 22:37 ` Peter Zijlstra
2015-10-28 19:49 ` Davidlohr Bueso
2015-11-02 20:15 ` Davidlohr Bueso
2015-11-03 0:06 ` Linus Torvalds
2015-11-03 1:36 ` Davidlohr Bueso
2016-01-12 13:57 ` Michael S. Tsirkin
2016-01-12 17:20 ` Linus Torvalds
2016-01-12 17:45 ` Michael S. Tsirkin
2016-01-12 18:04 ` Linus Torvalds
2016-01-12 20:30 ` Andy Lutomirski
2016-01-12 20:54 ` Linus Torvalds
2016-01-12 20:59 ` Andy Lutomirski
2016-01-12 21:37 ` Linus Torvalds
2016-01-12 22:14 ` Michael S. Tsirkin
2016-01-13 16:20 ` Michael S. Tsirkin
2016-01-12 22:21 ` Michael S. Tsirkin
2016-01-12 22:55 ` H. Peter Anvin
2016-01-12 23:24 ` Linus Torvalds
2016-01-13 16:17 ` Borislav Petkov
2016-01-13 16:25 ` Michael S. Tsirkin
2016-01-13 16:33 ` Borislav Petkov
2016-01-13 16:42 ` Michael S. Tsirkin
2016-01-13 16:53 ` Borislav Petkov [this message]
2016-01-13 17:00 ` Michael S. Tsirkin
2016-01-13 18:38 ` Linus Torvalds
2015-10-27 19:53 ` [PATCH 4/4] doc,smp: Remove ambiguous statement in smp_store_mb() Davidlohr Bueso
2015-12-04 12:01 ` [tip:locking/core] locking/barriers, arch: Remove ambiguous statement in the smp_store_mb() documentation tip-bot for Davidlohr Bueso
2015-10-27 23:27 ` [PATCH 1/4] arch,cmpxchg: Remove tas() definitions David Howells
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