linux-kernel - Re: [PATCH 2/4] x86: Track minimum microcode revision globally v2

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Date:	Wed, 13 Jun 2012 23:35:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, eranian@...gle.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/4] x86: Track minimum microcode revision globally v2

On Wed, 2012-06-13 at 13:20 -0700, Andi Kleen wrote:
> diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
> index 8a2ce8f..b589c7a 100644
> --- a/arch/x86/kernel/microcode_amd.c
> +++ b/arch/x86/kernel/microcode_amd.c
> @@ -215,6 +215,7 @@ static int apply_microcode_amd(int cpu)
>         pr_info("CPU%d: new patch_level=0x%08x\n", cpu, rev);
>         uci->cpu_sig.rev = rev;
>         c->microcode = rev;
> +       update_min_microcode(c);
>  
>         return 0;
>  }
> diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
> index 899057b..63e8a71 100644
> --- a/arch/x86/kernel/microcode_intel.c
> +++ b/arch/x86/kernel/microcode_intel.c
> @@ -326,6 +326,7 @@ static int apply_microcode(int cpu)
>         uci->cpu_sig.rev = val[1];
>         c->microcode = val[1];
>  
> +       update_min_microcode(c);
>         return 0;
>  } 

This would really much better live in common code where it can be
preemptible in some sites. There really is no need for this to be
non-preemptible.
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