Re: [PATCH RFC 09/10] unwind: Introduce SFrame user space unwinding

[kernel test robot <lkp@intel.com>]

Hi Josh,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on next-20231110]
[cannot apply to perf-tools-next/perf-tools-next tip/perf/core perf-tools/perf-tools acme/perf/core v6.6]
[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/Josh-Poimboeuf/perf-Remove-get_perf_callchain-init_nr-argument/20231109-085548
base:   linus/master
patch link:    https://lore.kernel.org/r/09460e60dd1c2f8ea1abb8d9188195db699ce76f.1699487758.git.jpoimboe%40kernel.org
patch subject: [PATCH RFC 09/10] unwind: Introduce SFrame user space unwinding
config: x86_64-randconfig-001-20231110 (https://download.01.org/0day-ci/archive/20231110/202311101855.npau2GOV-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231110/202311101855.npau2GOV-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311101855.npau2GOV-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from kernel/unwind/user.c:9:0:
>> arch/x86/include/asm/user_unwind.h:6:13: warning: overflow in implicit constant conversion [-Woverflow]
     .ra_off  = sizeof(long) * -1,    \
                ^
   kernel/unwind/user.c:12:2: note: in expansion of macro 'ARCH_INIT_USER_FP_FRAME'
     ARCH_INIT_USER_FP_FRAME
     ^~~~~~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/user_unwind.h:8:13: warning: overflow in implicit constant conversion [-Woverflow]
     .fp_off  = sizeof(long) * -2,    \
                ^
   kernel/unwind/user.c:12:2: note: in expansion of macro 'ARCH_INIT_USER_FP_FRAME'
     ARCH_INIT_USER_FP_FRAME
     ^~~~~~~~~~~~~~~~~~~~~~~


vim +6 arch/x86/include/asm/user_unwind.h

c8c95a7eb658588 Josh Poimboeuf 2023-11-08   4  
c8c95a7eb658588 Josh Poimboeuf 2023-11-08   5  #define ARCH_INIT_USER_FP_FRAME						\
c8c95a7eb658588 Josh Poimboeuf 2023-11-08  @6  	.ra_off		= sizeof(long) * -1,				\
c8c95a7eb658588 Josh Poimboeuf 2023-11-08   7  	.cfa_off	= sizeof(long) * 2,				\
c8c95a7eb658588 Josh Poimboeuf 2023-11-08   8  	.fp_off		= sizeof(long) * -2,				\
c8c95a7eb658588 Josh Poimboeuf 2023-11-08   9  	.use_fp		= true,
c8c95a7eb658588 Josh Poimboeuf 2023-11-08  10  

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