[kbuild-all] Re: [linux-stable-rc:linux-5.4.y 2563/9999] arch/ia64/kernel/kprobes.c:401:24: error: implicit declaration of function '__kretprobe_trampoline_handler'; did you mean 'kretprobe_trampoline'?

On Thu, 13 Jan 2022 04:15:43 +0800 kernel test robot <lkp(a)intel.com&gt; wrote: > Hi Masami, > > FYI, the error/warning still remains. > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y > head: 0a4ce4977bbeea4560a1f32632650b388c834c8a > commit: 77fa5e15c933a1ec812de61ad709c00aa51e96ae [2563/9999] ia64: kprobes: Use generic kretprobe trampoline handler > config: ia64-randconfig-r002-20220112 (https://download.01.org/0day-ci/archive/20220113/202201130408.tdm9swhk-lk...) > compiler: ia64-linux-gcc (GCC) 11.2.0 > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... > 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-5.4.y > git checkout 77fa5e15c933a1ec812de61ad709c00aa51e96ae > # save the config file to linux build tree > mkdir build_dir > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=ia64 SHELL=/bin/bash > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp(a)intel.com&gt; > > All errors (new ones prefixed by >>): > > arch/ia64/kernel/kprobes.c: In function 'get_kprobe_inst': > arch/ia64/kernel/kprobes.c:325:22: warning: variable 'template' set but not used [-Wunused-but-set-variable] > 325 | unsigned int template; > | ^~~~~~~~ OK, this is another issue, which is in the upstream master too. > arch/ia64/kernel/kprobes.c: At top level: > arch/ia64/kernel/kprobes.c:399:15: warning: no previous prototype for 'trampoline_probe_handler' [-Wmissing-prototypes] > 399 | int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs) > | ^~~~~~~~~~~~~~~~~~~~~~~~ > arch/ia64/kernel/kprobes.c: In function 'trampoline_probe_handler': > >> arch/ia64/kernel/kprobes.c:401:24: error: implicit declaration of function '__kretprobe_trampoline_handler'; did you mean 'kretprobe_trampoline'? [-Werror=implicit-function-declaration] > 401 | regs->cr_iip = __kretprobe_trampoline_handler(regs, kretprobe_trampoline, NULL); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > | kretprobe_trampoline > cc1: some warnings being treated as errors This seems that the upstream commit e792ff804f49720ce003b3e4c618b5d996256a18 has been picked to the stable-5.4.y tree accidentally. That is a part of lockless kretprobe series and should not be picked to the stable tree. Greg, can you revert commit 77fa5e15c933a1ec812de61ad709c00aa51e96ae ? (Or should I send revert patch?)