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

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Message-ID: <20081106084211.GA4890@elte.hu>
Date:	Thu, 6 Nov 2008 09:42:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	jens.axboe@...cle.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


* 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?

	Ingo
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