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authorNick Desaulniers <ndesaulniers@google.com>2021-04-09 23:27:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-04-10 00:54:23 +0300
commit9562fd132985ea9185388a112e50f2a51557827d (patch)
tree04ae60b766d4cfd2d51f39ddcdef087f4da8c9c3 /init
parenta3a8833dffb7e7329c2586b8bfc531adb503f123 (diff)
downloadlinux-9562fd132985ea9185388a112e50f2a51557827d.tar.xz
gcov: re-fix clang-11+ support
LLVM changed the expected function signature for llvm_gcda_emit_function() in the clang-11 release. Users of clang-11 or newer may have noticed their kernels producing invalid coverage information: $ llvm-cov gcov -a -c -u -f -b <input>.gcda -- gcno=<input>.gcno 1 <func>: checksum mismatch, \ (<lineno chksum A>, <cfg chksum B>) != (<lineno chksum A>, <cfg chksum C>) 2 Invalid .gcda File! ... Fix up the function signatures so calling this function interprets its parameters correctly and computes the correct cfg checksum. In particular, in clang-11, the additional checksum is no longer optional. Link: https://reviews.llvm.org/rG25544ce2df0daa4304c07e64b9c8b0f7df60c11d Link: https://lkml.kernel.org/r/20210408184631.1156669-1-ndesaulniers@google.com Reported-by: Prasad Sodagudi <psodagud@quicinc.com> Tested-by: Prasad Sodagudi <psodagud@quicinc.com> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Cc: <stable@vger.kernel.org> [5.4+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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