linux-kernel - Re: [patch 2/3] x86: Add smp_mb() before sending INVALIDATE_TLB

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Date:	Thu, 6 Nov 2008 09:43:31 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	jeremy.fitzhardinge@...rix.com, nickpiggin@...oo.com.au,
	torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, venkatesh.pallipadi@...el.com
Subject: Re: [patch 2/3] x86: Add smp_mb() before sending INVALIDATE_TLB_VECTOR

On Thu, Nov 06 2008, Ingo Molnar wrote:
> 
> * Suresh Siddha <suresh.b.siddha@...el.com> wrote:
> 
> > On x86, x2apic mode accesses for sending IPI's don't have 
> > serializing semantics. If the IPI receiver refers(in lock-free 
> > fashion) to some memory setup by the sender, the need for smp_mb() 
> > before sending the IPI becomes critical in x2apic mode.
> > 
> > Add the smp_mb() in native_flush_tlb_others() before sending the 
> > IPI.
> > 
> > Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
> 
> applied to tip/x86/urgent, thanks Suresh!
> 
> Jens, you'll send 1/3 and 3/3 to Linus, right?

Yes, it's in for-linus and I'll send the pull request today.

-- 
Jens Axboe

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