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Date: Wed, 15 Apr 2009 12:46:05 -0700
From: Yinghai Lu <yinghai@kernel.org>
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To: Ingo Molnar <mingo@elte.hu>
CC: Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Joerg Roedel <joerg.roedel@amd.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       stable@kernel.org
Subject: Re: [PATCH] x86: used used_vectors in init_IRQ
References: <49E62DFD.6010904@kernel.org> <20090415192550.GA27004@elte.hu> <49E636F2.7030902@kernel.org> <20090415193827.GB32675@elte.hu>
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Ingo Molnar wrote:
> * Yinghai Lu <yinghai@kernel.org> wrote:
> 
>> Ingo Molnar wrote:
>>
>>> Note, i removed the -stable tag because i dont think .29 nor 
>>> .30-rc2 is affected. Your patch to irqinit*.c (and the later 
>>> unification by Pekka) is something still pending in the 
>>> perfcounters and x86 trees, queued for .31.
>> not sure .29, but it seems we need this for 2.6.30
>>

you are right...

in trap_init with linus tree

still have
#ifdef CONFIG_X86_64
        set_bit(IA32_SYSCALL_VECTOR, used_vectors);
#else
        set_bit(SYSCALL_VECTOR, used_vectors);
#endif


so one patch (merge irqinit_32/64) in tip for .31 expose that bug.

aka we don't back port ...

YH