On Mon, May 14, 2018 at 09:44:48PM +0800, kbuild test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/pti
> head: 51bad67ffbce0aaa44579f84ef5d05597054ec6a
> commit: 51bad67ffbce0aaa44579f84ef5d05597054ec6a [14/14] x86/asm: Pad
> assembly functions with INT3 instructions
> config: x86_64-randconfig-x018-201819 (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
> reproduce:
> git checkout 51bad67ffbce0aaa44579f84ef5d05597054ec6a
> # save the attached .config to linux build tree
> make ARCH=x86_64
>
> All warnings (new ones prefixed by >>):
>
> >> arch/x86/mm/mem_encrypt_boot.o: warning: objtool: .text+0x51: unreachable
> >> instruction
> >> arch/x86/xen/xen-asm.o: warning: objtool: .text+0x1a: unreachable
> >> instruction
There are warnings:
arch/x86/lib/clear_page_64.o: warning: objtool: .text+0xb: unreachable
instruction
0000000000000000 <clear_page_rep>:
0: b9 00 02 00 00 mov ecx,0x200
5: 31 c0 xor eax,eax
7: f3 48 ab rep stos QWORD PTR es:[rdi],rax
a: c3 ret
===> b: cc int3
c: cc int3
d: cc int3
e: cc int3
f: cc int3
0000000000000010 <clear_page_orig>:
But both function are annotated with ENTRY/ENDPROC.
