[linux-stable-rc:linux-5.15.y 7064/7855] fs/afs/write.o: warning: objtool: afs_write_back_from_locked_page()+0x23d: unreachable instruction

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y
head:   2e65f63d5e2c817d883c4c8df2010aa23bd07ea4
commit: dd07286924134bff9dcf85e59f02c63b197e5af1 [7064/7855] afs: Adjust ACK interpretation to try and cope with NAT
config: x86_64-randconfig-r026-20220613 (https://download.01.org/0day-ci/archive/20220615/202206151348.JwVjfqCd-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=dd07286924134bff9dcf85e59f02c63b197e5af1
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-5.15.y
        git checkout dd07286924134bff9dcf85e59f02c63b197e5af1
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> fs/afs/write.o: warning: objtool: afs_write_back_from_locked_page()+0x23d: unreachable instruction

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