Re: [PATCH] posix_acl: Use try_cmpxchg in get_acl

[kernel test robot <rong.a.chen@intel.com>]

Hi Uros,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.19-rc6 next-20220715]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: 
https://github.com/intel-lab-lkp/linux/commits/Uros-Bizjak/posix_acl-Use-try_cmpxchg-in-get_acl/20220715-014002
base: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
4a57a8400075bc5287c5c877702c68aeae2a033d
config: powerpc-sam440ep_defconfig 
(https://download.01.org/0day-ci/archive/20220716/202207162205.iBwToBEr-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 12.1.0
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://github.com/intel-lab-lkp/linux/commit/8291d21630df3a57adf6d0ed8a1cded2a2700f66
         git remote add linux-review https://github.com/intel-lab-lkp/linux
         git fetch --no-tags linux-review 
Uros-Bizjak/posix_acl-Use-try_cmpxchg-in-get_acl/20220715-014002
         git checkout 8291d21630df3a57adf6d0ed8a1cded2a2700f66
         # save the config file
         mkdir build_dir && cp config build_dir/.config
         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross 
W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

    In file included from include/linux/kernel.h:20,
                     from fs/posix_acl.c:14:
    fs/posix_acl.c: In function 'get_acl':
>> include/linux/atomic/atomic-arch-fallback.h:90:34: error: initialization of 'struct posix_acl **' from incompatible pointer type 'void **' [-Werror=incompatible-pointer-types]
       90 |         typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
          |                                  ^
    include/linux/compiler.h:78:45: note: in definition of macro 'unlikely'
       78 | # define unlikely(x)    __builtin_expect(!!(x), 0)
          |                                             ^
    include/linux/atomic/atomic-instrumented.h:1978:9: note: in 
expansion of macro 'arch_try_cmpxchg'
     1978 |         arch_try_cmpxchg(__ai_ptr, __ai_oldp, __VA_ARGS__); \
          |         ^~~~~~~~~~~~~~~~
    fs/posix_acl.c:167:23: note: in expansion of macro 'try_cmpxchg'
      167 |         if (unlikely(!try_cmpxchg(p, &sentinel, acl)))
          |                       ^~~~~~~~~~~
    cc1: some warnings being treated as errors


vim +90 include/linux/atomic/atomic-arch-fallback.h

29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  86  29f006fdefe6f8 include/linux/atomic-arch-fallback.h 
Peter Zijlstra 2020-08-29  87  #ifndef arch_try_cmpxchg
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  88  #define arch_try_cmpxchg(_ptr, _oldp, _new) \
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  89  ({ \
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29 @90  	typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  91  	___r = arch_cmpxchg((_ptr), ___o, (_new)); \
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  92  	if (unlikely(___r != ___o)) \
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  93  		*___op = ___r; \
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  94  	likely(___r == ___o); \
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  95  })
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  96  #endif /* arch_try_cmpxchg */
29f006fdefe6f8 include/linux/atomic-arch-fallback.h Peter Zijlstra 
2020-08-29  97
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