linux-kernel - Re: [PATCH 04/10] MCE: Move ADDR/MISC reading code into common function

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Date:	Fri, 10 Jun 2011 11:33:12 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH 04/10] MCE: Move ADDR/MISC reading code into common
 function

On Thu, Jun 09, 2011 at 05:32:41PM -0400, Luck, Tony wrote:
> From: Andi Kleen <andi@...stfloor.org>
> 
> Used for next patch.

Yeah, let's have a more general comment here like "save us some code
duplication"

> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---
>  arch/x86/kernel/cpu/mcheck/mce.c |   21 +++++++++++++--------
>  1 files changed, 13 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index cbd4b0f..0349e87 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -532,6 +532,17 @@ static void mce_report_event(struct pt_regs *regs)
>  #endif
>  }
>  
> +/*
> + * Read ADDR and MISC registers.
> + */

No need for that comment, IMO. Function is small enough and the macros
speak for themselves :).

> +static void mce_read_aux(struct mce *m, int i)

inline?

> +{
> +	if (m->status & MCI_STATUS_MISCV)
> +		m->misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i));
> +	if (m->status & MCI_STATUS_ADDRV)
> +		m->addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i));
> +}
> +
>  DEFINE_PER_CPU(unsigned, mce_poll_count);
>  
>  /*
> @@ -582,10 +593,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
>  		    (m.status & (mce_ser ? MCI_STATUS_S : MCI_STATUS_UC)))
>  			continue;
>  
> -		if (m.status & MCI_STATUS_MISCV)
> -			m.misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i));
> -		if (m.status & MCI_STATUS_ADDRV)
> -			m.addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i));
> +		mce_read_aux(&m, i);
>  
>  		if (!(flags & MCP_TIMESTAMP))
>  			m.tsc = 0;
> @@ -1027,10 +1035,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
>  		if (severity == MCE_AR_SEVERITY)
>  			kill_it = 1;
>  
> -		if (m.status & MCI_STATUS_MISCV)
> -			m.misc = mce_rdmsrl(MSR_IA32_MCx_MISC(i));
> -		if (m.status & MCI_STATUS_ADDRV)
> -			m.addr = mce_rdmsrl(MSR_IA32_MCx_ADDR(i));
> +		mce_read_aux(&m, i);
>  
>  		/*
>  		 * Action optional error. Queue address for later processing.
> -- 
> 1.7.3.1
> 
> 

-- 
Regards/Gruss,
Boris.

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