On Sat, 22 Oct 2016 15:53:03 +0800
kbuild test robot [off-list ref] wrote:

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git test
head:   8a4fd950c8ac67ad98135db4107ed6cae412606c
commit: b09fa228be430ba2745102ac8e668ad869320bd9 [24/28] powerpc: link warning for orphan sections
config: powerpc-ps3_defconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout b09fa228be430ba2745102ac8e668ad869320bd9
        # save the attached .config to linux build tree
        make.cross ARCH=powerpc 

All warnings (new ones prefixed by >>):

quoted

quoted

powerpc64-linux-gnu-ld: warning: orphan section `.text.save.restore' from `arch/powerpc/lib/built-in.o' being placed in section `.text.save.restore'.
powerpc64-linux-gnu-ld: warning: orphan section `.text.save.restore' from `arch/powerpc/lib/built-in.o' being placed in section `.text.save.restore'.
powerpc64-linux-gnu-ld: warning: orphan section `.text.save.restore' from `arch/powerpc/lib/built-in.o' being placed in section `.text.save.restore'.  

On powerpc64, ld creates these for us when required, and puts them into
section ".sfpr". So we can avoid compiling in lib/crtsavres.S entirely
there, I think.

When I do that, I see the save/restore functions getting located at
0x8000. That actually works with my .linker_stub_catch patch, but there
is probably no good reason to put those sections there, so I'll change
.sfpr in the linker script to be near the end of the main text output
section.

Thanks,
Nick