From: ShuoX Liu <shuox.liu@intel.com>
To: Borislav Petkov <bp@alien8.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Yanmin Zhang <yanmin_zhang@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
andi@firstfloor.org, Tony Luck <tony.luck@intel.com>,
Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 2/2] x86 mce: use new printk recursion disabling interface
Date: Fri, 25 May 2012 16:00:23 +0800 [thread overview]
Message-ID: <4FBF3C17.1090000@intel.com> (raw)
In-Reply-To: <20120525074114.GA5417@liondog.tnic>
On 2012年05月25日 15:41, Borislav Petkov wrote:
> On Fri, May 25, 2012 at 03:21:12PM +0800, ShuoX Liu wrote:
>> From: ShuoX Liu <shuox.liu@intel.com>
>>
>> Disable printk recursion to make sure MCE logs printed out.
>>
>> Signed-off-by: Yanmin Zhang <yanmin_zhang@linux.intel.com>
>> Signed-off-by: ShuoX Liu <shuox.liu@intel.com>
>> ---
>> arch/x86/kernel/cpu/mcheck/mce.c | 2 ++
>> 1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
>> index 2afcbd2..365c35d 100644
>> --- a/arch/x86/kernel/cpu/mcheck/mce.c
>> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
>> @@ -1015,6 +1015,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
>> DECLARE_BITMAP(toclear, MAX_NR_BANKS);
>> char *msg = "Unknown";
>>
>> + printk_recursion_check_disable();
>> atomic_inc(&mce_entry);
>>
>> this_cpu_inc(mce_exception_count);
>> @@ -1144,6 +1145,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
>> mce_wrmsrl(MSR_IA32_MCG_STATUS, 0);
>> out:
>> atomic_dec(&mce_entry);
>> + printk_recursion_check_enable();
>
> Looks like those should be at the beginning and the end of print_mce() -
> do_machine_check() could exit without printing an MCE and disabling the
> recursion check then is superfluous, methinks.
Thanks for comment. It seems you are right. I will check the code next
Monday.
>
> Thanks.
>
next prev parent reply other threads:[~2012-05-25 8:01 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-23 1:58 [PATCH] printk: ignore recursion_bug flag when MCE in progress ShuoX Liu
2012-05-23 10:01 ` Borislav Petkov
2012-05-24 0:38 ` Yanmin Zhang
2012-05-24 5:59 ` [PATCH v2] printk: ignore recursion_bug flag in HW error handle process ShuoX Liu
2012-05-24 6:11 ` Borislav Petkov
2012-05-24 22:56 ` Andrew Morton
2012-05-25 0:30 ` Yanmin Zhang
2012-05-25 7:19 ` [PATCH 1/2] printk: add interface for disabling recursion check ShuoX Liu
2012-05-25 7:21 ` [PATCH 2/2] x86 mce: use new printk recursion disabling interface ShuoX Liu
2012-05-25 7:41 ` Borislav Petkov
2012-05-25 8:00 ` ShuoX Liu [this message]
2012-05-28 2:07 ` ShuoX Liu
2012-05-30 9:08 ` Borislav Petkov
2012-05-31 0:30 ` Yanmin Zhang
2012-06-04 3:04 ` [PATCH v4 1/2] printk: add interface for disabling recursion check ShuoX Liu
2012-06-04 3:07 ` [PATCH v4 2/2] x86 mce: use new printk recursion disabling interface ShuoX Liu
2012-06-22 23:41 ` Andrew Morton
2012-06-26 20:45 ` Borislav Petkov
2012-05-25 16:09 ` [PATCH 1/2] printk: add interface for disabling recursion check Luck, Tony
2012-05-28 0:30 ` Yanmin Zhang
2012-05-28 2:54 ` [PATCH v3 " ShuoX Liu
2012-05-28 2:56 ` [PATCH v3 2/2] x86 mce: use new printk recursion disabling interface ShuoX Liu
2012-06-04 17:12 ` Borislav Petkov
2012-06-05 0:32 ` Yanmin Zhang
2012-06-05 8:14 ` Borislav Petkov
2012-06-05 9:53 ` [PATCH v5 1/2] printk: add interface for disabling recursion check ShuoX Liu
2012-06-05 9:55 ` [PATCH v5 2/2] x86 mce: use new printk recursion disabling interface ShuoX Liu
2012-06-05 15:15 ` Borislav Petkov
2012-06-06 0:36 ` Yanmin Zhang
2012-06-06 8:31 ` [PATCH v6 1/2] printk: add interface for disabling recursion check ShuoX Liu
2012-06-06 8:34 ` [PATCH v6 2/2] x86 mce: use new printk recursion disabling interface ShuoX Liu
2012-06-06 15:22 ` Borislav Petkov
2012-06-07 2:13 ` Yanmin Zhang
2012-06-07 2:57 ` [PATCH v7 1/2] printk: add interface for disabling recursion check ShuoX Liu
2012-06-07 3:00 ` [PATCH v7 2/2] x86 mce: use new printk recursion disabling interface ShuoX Liu
2012-06-08 12:34 ` Borislav Petkov
2012-06-25 9:17 ` Ingo Molnar
2012-06-25 13:14 ` Peter Zijlstra
2012-06-26 20:43 ` Borislav Petkov
2012-06-07 13:19 ` [PATCH v7 1/2] printk: add interface for disabling recursion check bing deng
2012-06-07 13:38 ` Borislav Petkov
2012-06-08 12:30 ` Borislav Petkov
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