linux-kernel - [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

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Date:   Thu, 13 Jan 2022 04:15:43 +0800
From:   kernel test robot <lkp@...el.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [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'?

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-lkp@intel.com/config)
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.git/commit/?id=77fa5e15c933a1ec812de61ad709c00aa51e96ae
        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@...el.com>

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;
         |                      ^~~~~~~~
   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


vim +401 arch/ia64/kernel/kprobes.c

   398	
   399	int __kprobes trampoline_probe_handler(struct kprobe *p, struct pt_regs *regs)
   400	{
 > 401		regs->cr_iip = __kretprobe_trampoline_handler(regs, kretprobe_trampoline, NULL);
   402		/*
   403		 * By returning a non-zero value, we are telling
   404		 * kprobe_handler() that we don't want the post_handler
   405		 * to run (and have re-enabled preemption)
   406		 */
   407		return 1;
   408	}
   409	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org