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Subjectinclude/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: 1e16624d7b4376797ede36e3c955375cf0f23298
commit: bccf1ec369ac126b0997d01a6e1deae00e2cf6b3 locking/atomics: atomic-instrumented: simplify ifdeffery
date: 6 weeks ago
config: arc-allyesconfig (attached as .config)
compiler: arceb-elf-gcc (GCC) 9.3.0
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-9.3.0 make.cross ARCH=arc

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.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@infradead.org>
:::::: CC: Ingo Molnar <mingo@kernel.org>

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