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From: Rong Chen <rong.a.chen@intel.com>
To: Frederic Weisbecker <frederic@kernel.org>,
	kbuild test robot <lkp@intel.com>
Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
	Ingo Molnar <mingo@kernel.org>
Subject: Re: [kbuild-all] Re: arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction
Date: Mon, 9 Mar 2020 16:37:24 +0800	[thread overview]
Message-ID: <d242f3cb-e95b-441e-0a32-a0279100eeaf@intel.com> (raw)
In-Reply-To: <20200306142732.GA8590@lenoir>



On 3/6/20 10:27 PM, Frederic Weisbecker wrote:
> On Fri, Mar 06, 2020 at 06:48:47PM +0800, kbuild test robot wrote:
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   9f65ed5fe41ce08ed1cb1f6a950f9ec694c142ad
>> commit: ee6352b2c47a24234398e06381edd93a8e965976 x86/context-tracking: Remove exception_enter/exit() from do_page_fault()
>> date:   8 weeks ago
>> config: x86_64-randconfig-a002-20200306 (attached as .config)
>> compiler: gcc-4.9 (Debian 4.9.2-10+deb8u1) 4.9.2
>> reproduce:
>>          git checkout ee6352b2c47a24234398e06381edd93a8e965976
>>          # save the attached .config to linux build tree
>>          make ARCH=x86_64
>>
>> If you fix the issue, kindly add following tag
>> Reported-by: kbuild test robot <lkp@intel.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction
> I tried several versions of gcc and I can't reproduce the warning. Also looking
> at the code I fail to find an actual unreachable path. Do you still have the vmlinux around?
>
>

Hi Frederic,

Sorry for the inconvenience, we checked again and only found this issue 
on gcc-4.9.2,
and there's no issue on gcc-4.9.3 or other new versions.

Best Regards,
Rong Chen

WARNING: multiple messages have this Message-ID (diff)
From: Rong Chen <rong.a.chen@intel.com>
To: kbuild-all@lists.01.org
Subject: Re: arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction
Date: Mon, 09 Mar 2020 16:37:24 +0800	[thread overview]
Message-ID: <d242f3cb-e95b-441e-0a32-a0279100eeaf@intel.com> (raw)
In-Reply-To: <20200306142732.GA8590@lenoir>

[-- Attachment #1: Type: text/plain, Size: 1329 bytes --]



On 3/6/20 10:27 PM, Frederic Weisbecker wrote:
> On Fri, Mar 06, 2020 at 06:48:47PM +0800, kbuild test robot wrote:
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   9f65ed5fe41ce08ed1cb1f6a950f9ec694c142ad
>> commit: ee6352b2c47a24234398e06381edd93a8e965976 x86/context-tracking: Remove exception_enter/exit() from do_page_fault()
>> date:   8 weeks ago
>> config: x86_64-randconfig-a002-20200306 (attached as .config)
>> compiler: gcc-4.9 (Debian 4.9.2-10+deb8u1) 4.9.2
>> reproduce:
>>          git checkout ee6352b2c47a24234398e06381edd93a8e965976
>>          # save the attached .config to linux build tree
>>          make ARCH=x86_64
>>
>> If you fix the issue, kindly add following tag
>> Reported-by: kbuild test robot <lkp@intel.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction
> I tried several versions of gcc and I can't reproduce the warning. Also looking
> at the code I fail to find an actual unreachable path. Do you still have the vmlinux around?
>
>

Hi Frederic,

Sorry for the inconvenience, we checked again and only found this issue 
on gcc-4.9.2,
and there's no issue on gcc-4.9.3 or other new versions.

Best Regards,
Rong Chen

  reply	other threads:[~2020-03-09  8:37 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-06 10:48 arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction kbuild test robot
2020-03-06 10:48 ` kbuild test robot
2020-03-06 14:27 ` Frederic Weisbecker
2020-03-06 14:27   ` Frederic Weisbecker
2020-03-09  8:37   ` Rong Chen [this message]
2020-03-09  8:37     ` Rong Chen

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