linux-kernel - [jolsa-perf:bpf/tramp_11 19/21] kernel/bpf/trampoline.c:81:17: warning: address of stack memory associated with parameter 'id' returned

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Message-ID: <202206232231.u4YhpRYy-lkp@intel.com>
Date:   Thu, 23 Jun 2022 22:48:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [jolsa-perf:bpf/tramp_11 19/21] kernel/bpf/trampoline.c:81:17:
 warning: address of stack memory associated with parameter 'id' returned

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/tramp_11
head:   c807110aa605281263da02a78af57847f5c4275e
commit: a2660a85cc98b2db2577fd844985884cff0e5cae [19/21] bpf: Add support to store multiple ids in bpf_tramp_id object
config: i386-randconfig-a015 (https://download.01.org/0day-ci/archive/20220623/202206232231.u4YhpRYy-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 46be5faaf03466c3751f8a2882bef5a217e15926)
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/jolsa/perf.git/commit/?id=a2660a85cc98b2db2577fd844985884cff0e5cae
        git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
        git fetch --no-tags jolsa-perf bpf/tramp_11
        git checkout a2660a85cc98b2db2577fd844985884cff0e5cae
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash kernel/bpf/

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

All warnings (new ones prefixed by >>):

>> kernel/bpf/trampoline.c:81:17: warning: address of stack memory associated with parameter 'id' returned [-Wreturn-stack-address]
                   return (u64) &id;
                                 ^~
   1 warning generated.


vim +/id +81 kernel/bpf/trampoline.c

    77	
    78	static u64 bpf_tramp_id_key(struct bpf_tramp_id *id)
    79	{
    80		if (bpf_tramp_id_is_multi(id))
  > 81			return (u64) &id;
    82		else
    83			return ((u64) id->obj_id << 32) | id->id[0];
    84	}
    85	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp