linux-kernel - Re: [PATCH 3/6] x86, mce: create helper function to save addr/misc when needed

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Message-ID: <4EEA8D3A.7050205@jp.fujitsu.com>
Date:	Fri, 16 Dec 2011 09:13:46 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Tony Luck <tony.luck@...el.com>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Borislav Petkov <bp@...64.org>,
	"Huang, Ying" <ying.huang@...el.com>
Subject: Re: [PATCH 3/6] x86, mce: create helper function to save addr/misc
 when needed

(2011/12/14 2:48), Tony Luck wrote:
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index 265139d..43f22c8 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -492,6 +492,27 @@ static void mce_report_event(struct pt_regs *regs)
>  	irq_work_queue(&__get_cpu_var(mce_irq_work));
>  }
>  
> +/*
> + * Read ADDR and MISC registers.
> + */
> +static void mce_read_aux(struct mce *m, int i)
> +{
> +	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));
> +
> +		/*
> +		 * Mask the reported address by the reported granularity.
> +		 */
> +		if (mce_ser && (m->status & MCI_STATUS_MISCV)) {
> +			u8 shift = m->misc & 0x3f;

(nitpick) You can use:

#define MCI_MISC_ADDR_LSB(m)    ((m) & 0x3f)

> +			m->addr >>= shift;
> +			m->addr <<= shift;
> +		}
> +	}
> +}
> +
>  DEFINE_PER_CPU(unsigned, mce_poll_count);
>  
>  /*

Thanks,
H.Seto

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