linux-kernel - include/linux/atomic-arch-fallback.h:60:32: error: implicit declaration of function 'arch_cmpxchg64'; did you mean 'arch

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Message-ID: <202107232355.aCqvXKrs-lkp@intel.com>
Date:   Fri, 23 Jul 2021 23:25:06 +0800
From:   kernel test robot <lkp@...el.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: include/linux/atomic-arch-fallback.h:60:32: error: implicit
 declaration of function 'arch_cmpxchg64'; did you mean 'arch_cmpxchg'?

Hi Mark,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8baef6386baaefb776bdd09b5c7630cf057c51c6
commit: bccf1ec369ac126b0997d01a6e1deae00e2cf6b3 locking/atomics: atomic-instrumented: simplify ifdeffery
date:   8 weeks ago
config: arc-buildonly-randconfig-r003-20210722 (attached as .config)
compiler: arceb-elf-gcc (GCC) 10.3.0
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/torvalds/linux.git/commit/?id=bccf1ec369ac126b0997d01a6e1deae00e2cf6b3
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout bccf1ec369ac126b0997d01a6e1deae00e2cf6b3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross ARCH=arc 

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 >>):

   In file included from include/linux/atomic.h:80,
                    from drivers/iommu/io-pgtable-arm.c:12:
   drivers/iommu/io-pgtable-arm.c: In function 'arm_lpae_install_table':
>> include/linux/atomic-arch-fallback.h:60:32: error: implicit declaration of function 'arch_cmpxchg64'; did you mean 'arch_cmpxchg'? [-Werror=implicit-function-declaration]
      60 | #define arch_cmpxchg64_relaxed arch_cmpxchg64
         |                                ^~~~~~~~~~~~~~
   include/asm-generic/atomic-instrumented.h:1261:2: note: in expansion of macro 'arch_cmpxchg64_relaxed'
    1261 |  arch_cmpxchg64_relaxed(__ai_ptr, __VA_ARGS__); \
         |  ^~~~~~~~~~~~~~~~~~~~~~
   drivers/iommu/io-pgtable-arm.c:320:8: note: in expansion of macro 'cmpxchg64_relaxed'
     320 |  old = cmpxchg64_relaxed(ptep, curr, new);
         |        ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +60 include/linux/atomic-arch-fallback.h

37f8173dd84936 Peter Zijlstra 2020-01-24  56  
37f8173dd84936 Peter Zijlstra 2020-01-24  57  #ifndef arch_cmpxchg64_relaxed
37f8173dd84936 Peter Zijlstra 2020-01-24  58  #define arch_cmpxchg64_acquire arch_cmpxchg64
37f8173dd84936 Peter Zijlstra 2020-01-24  59  #define arch_cmpxchg64_release arch_cmpxchg64
29f006fdefe6f8 Peter Zijlstra 2020-08-29 @60  #define arch_cmpxchg64_relaxed arch_cmpxchg64
37f8173dd84936 Peter Zijlstra 2020-01-24  61  #else /* arch_cmpxchg64_relaxed */
37f8173dd84936 Peter Zijlstra 2020-01-24  62  

:::::: The code at line 60 was first introduced by commit
:::::: 29f006fdefe6f88abde973a0b0f20d2704e93fd4 asm-generic/atomic: Add try_cmpxchg() fallbacks

:::::: TO: Peter Zijlstra <peterz@...radead.org>
:::::: CC: Ingo Molnar <mingo@...nel.org>

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

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