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SubjectRe: arch/x86/mm/fault.o: warning: objtool: do_page_fault()+0x4fb: unreachable instruction
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.

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