linux-kernel - Re: [ 33/73] x86, microcode: Sanitize per-cpu microcode reloading interface

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Date:	Fri, 3 Aug 2012 11:43:14 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Sven Joachim <svenjoac@....de>
Cc:	Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [ 33/73] x86, microcode: Sanitize per-cpu microcode reloading
 interface

On Fri, Aug 03, 2012 at 11:04:06AM +0200, Sven Joachim wrote:
> On 2012-07-31 06:43 +0200, Ben Hutchings wrote:
> 
> > 3.2-stable review patch.  If anyone has any objections, please let me know.
> 
> Alas, this does not build if CONFIG_SMP is unset:
> 
> ,----
> | arch/x86/kernel/microcode_core.c: In function 'reload_store':
> | arch/x86/kernel/microcode_core.c:304:19: error: 'struct cpuinfo_x86' has no member named 'cpu_index'
> `----

Crap. :-(

3.2 still has this:

<arch/x86/include/asm/processor.h>:
...
#ifdef CONFIG_SMP
        /* number of cores as seen by the OS: */
        u16                     booted_cores;
        /* Physical processor id: */
        u16                     phys_proc_id;
        /* Core id: */
        u16                     cpu_core_id;
        /* Compute unit id */
        u8                      compute_unit_id;
        /* Index into per_cpu list: */
        u16                     cpu_index;
#endif
        u32                     microcode;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));
---

which got removed by

commit 141168c36cdee3ff23d9c7700b0edc47cb65479f
Author: Kevin Winchester <kjwinchester@...il.com>
Date:   Tue Dec 20 20:52:22 2011 -0400

    x86: Simplify code by removing a !SMP #ifdefs from 'struct cpuinfo_x86'

Ben, you might want to backport this one too... I'll run a couple of 3.2
builds with it ontop of 3.2 to verify nothing else breaks.

Thanks.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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