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* arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction
@ 2020-03-06 10:48 kbuild test robot
  2020-03-06 14:27 ` Frederic Weisbecker
  0 siblings, 1 reply; 3+ messages in thread
From: kbuild test robot @ 2020-03-06 10:48 UTC (permalink / raw)
  To: Frederic Weisbecker; +Cc: kbuild-all, linux-kernel, Ingo Molnar

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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

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 31008 bytes --]

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction
  2020-03-06 10:48 arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction kbuild test robot
@ 2020-03-06 14:27 ` Frederic Weisbecker
  2020-03-09  8:37   ` [kbuild-all] " Rong Chen
  0 siblings, 1 reply; 3+ messages in thread
From: Frederic Weisbecker @ 2020-03-06 14:27 UTC (permalink / raw)
  To: kbuild test robot; +Cc: kbuild-all, linux-kernel, Ingo Molnar

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?

Thanks.


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [kbuild-all] Re: arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction
  2020-03-06 14:27 ` Frederic Weisbecker
@ 2020-03-09  8:37   ` Rong Chen
  0 siblings, 0 replies; 3+ messages in thread
From: Rong Chen @ 2020-03-09  8:37 UTC (permalink / raw)
  To: Frederic Weisbecker, kbuild test robot
  Cc: kbuild-all, linux-kernel, Ingo Molnar



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

^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2020-03-09  8:37 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-03-06 10:48 arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction kbuild test robot
2020-03-06 14:27 ` Frederic Weisbecker
2020-03-09  8:37   ` [kbuild-all] " Rong Chen

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