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SubjectRe: [PATCH v3] pgo: add clang's Profile Guided Optimization infrastructure
Hi Bill,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.11-rc3]
[cannot apply to powerpc/next s390/features tip/x86/core next-20210111]
[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]

base: a0d54b4f5b219fb31f0776e9f53aa137e78ae431
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
git remote add linux-review
git fetch --no-tags linux-review Bill-Wendling/pgo-add-clang-s-Profile-Guided-Optimization-infrastructure/20210112-133315
git checkout 6ab85bae7667afd0aa68c6442b7ca5c369fa1088
# save the attached .config to linux build tree
make W=1 ARCH=x86_64

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

All warnings (new ones prefixed by >>):

kernel/pgo/instrument.c:72:6: warning: no previous prototype for '__llvm_profile_instrument_target' [-Wmissing-prototypes]
72 | void __llvm_profile_instrument_target(u64 target_value, void *data, u32 index)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/pgo/instrument.c:135:6: warning: no previous prototype for '__llvm_profile_instrument_range' [-Wmissing-prototypes]
135 | void __llvm_profile_instrument_range(u64 target_value, void *data,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/pgo/instrument.c:179:6: warning: no previous prototype for '__llvm_profile_instrument_memop' [-Wmissing-prototypes]
179 | void __llvm_profile_instrument_memop(u64 target_value, void *data,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

vim +/__llvm_profile_instrument_memop +179 kernel/pgo/instrument.c

175 /*
176 * The target values are partitioned into multiple ranges. The range spec is
177 * defined in compiler-rt/include/profile/
178 */
> 179 void __llvm_profile_instrument_memop(u64 target_value, void *data,

0-DAY CI Kernel Test Service, Intel Corporation
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