linux-kernel - [peterz-queue:x86/wip.ibt 7/15] arch/x86/kernel/setup.c:65:1: warning: 'nocf_check' attribute ignored; use -fcf-protection to enable the attribute

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Message-ID: <202201151505.wRwvYlwh-lkp@intel.com>
Date:   Sat, 15 Jan 2022 15:31:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [peterz-queue:x86/wip.ibt 7/15] arch/x86/kernel/setup.c:65:1:
 warning: 'nocf_check' attribute ignored; use -fcf-protection to enable the
 attribute

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/wip.ibt
head:   7b31f08c5f3fb5f3cfd75deb24787569f35315d5
commit: e4b4623dc6a99968ab59ea14cdae2c7a09924838 [7/15] x86: Don't generate ENDBR in .discard.text
config: x86_64-randconfig-a003 (https://download.01.org/0day-ci/archive/20220115/202201151505.wRwvYlwh-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 82c8aca93488730ce8f66101e0f3538f14b551dd)
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/peterz/queue.git/commit/?id=e4b4623dc6a99968ab59ea14cdae2c7a09924838
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue x86/wip.ibt
        git checkout e4b4623dc6a99968ab59ea14cdae2c7a09924838
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/ arch/x86/mm/

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

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/setup.c:65:1: warning: 'nocf_check' attribute ignored; use -fcf-protection to enable the attribute [-Wignored-attributes]
   RESERVE_BRK(dmi_alloc, 65536);
   ^
   arch/x86/include/asm/setup.h:122:56: note: expanded from macro 'RESERVE_BRK'
           static void __section(".discard.text") __attribute__((nocf_check)) __used notrace               \
                                                                 ^
   1 warning generated.
--
>> arch/x86/mm/init.c:178:1: warning: 'nocf_check' attribute ignored; use -fcf-protection to enable the attribute [-Wignored-attributes]
   RESERVE_BRK(early_pgt_alloc, INIT_PGT_BUF_SIZE);
   ^
   arch/x86/include/asm/setup.h:122:56: note: expanded from macro 'RESERVE_BRK'
           static void __section(".discard.text") __attribute__((nocf_check)) __used notrace               \
                                                                 ^
   1 warning generated.


vim +/nocf_check +65 arch/x86/kernel/setup.c

2b72394e408964 Pekka Enberg                  2009-04-28  63  
e808bae2407a08 Thadeu Lima de Souza Cascardo 2010-02-09  64  #ifdef CONFIG_DMI
796216a57fe45c Jeremy Fitzhardinge           2009-03-12 @65  RESERVE_BRK(dmi_alloc, 65536);
e808bae2407a08 Thadeu Lima de Souza Cascardo 2010-02-09  66  #endif
796216a57fe45c Jeremy Fitzhardinge           2009-03-12  67  
c0b5842a457d44 Ingo Molnar                   2009-01-27  68  

:::::: The code at line 65 was first introduced by commit
:::::: 796216a57fe45c04adc35bda1f0782efec78a713 x86: allow extend_brk users to reserve brk space

:::::: TO: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
:::::: CC: H. Peter Anvin <hpa@...or.com>

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