linux/kernel/gcov, branch v5.12

Revert "gcov: clang: fix clang-11+ build"

2021-04-19T22:08:49Z

This reverts commit 04c53de57cb6435738961dace8b1b71d3ecd3c39. Nathan Chancellor points out that it should not have been merged into mainline by itself. It was a fix for "gcov: use kvmalloc()", which is still in -mm/-next. Merging it alone has broken the build. Link: https://github.com/ClangBuiltLinux/continuous-integration2/runs/2384465683?check_suite_focus=true Reported-by: Nathan Chancellor Cc: Johannes Berg Cc: Nick Desaulniers Cc: Andrew Morton Signed-off-by: Linus Torvalds

gcov: clang: fix clang-11+ build

2021-04-16T23:10:37Z

With clang-11+, the code is broken due to my kvmalloc() conversion (which predated the clang-11 support code) leaving one vmalloc() in place. Fix that. Link: https://lkml.kernel.org/r/20210412214210.6e1ecca9cdc5.I24459763acf0591d5e6b31c7e3a59890d802f79c@changeid Signed-off-by: Johannes Berg Reviewed-by: Nick Desaulniers Tested-by: Nick Desaulniers Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gcov: re-fix clang-11+ support

2021-04-09T21:54:23Z

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 .gcda -- gcno=.gcno 1 : checksum mismatch, \ (, ) != (, ) 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 Tested-by: Prasad Sodagudi Signed-off-by: Nick Desaulniers Reviewed-by: Nathan Chancellor Cc: [5.4+] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gcov: fix clang-11+ support

2021-03-25T16:22:55Z

LLVM changed the expected function signatures for llvm_gcda_start_file() and llvm_gcda_emit_function() in the clang-11 release. Users of clang-11 or newer may have noticed their kernels failing to boot due to a panic when enabling CONFIG_GCOV_KERNEL=y +CONFIG_GCOV_PROFILE_ALL=y. Fix up the function signatures so calling these functions doesn't panic the kernel. Link: https://reviews.llvm.org/rGcdd683b516d147925212724b09ec6fb792a40041 Link: https://reviews.llvm.org/rG13a633b438b6500ecad9e4f936ebadf3411d0f44 Link: https://lkml.kernel.org/r/20210312224132.3413602-2-ndesaulniers@google.com Signed-off-by: Nick Desaulniers Reported-by: Prasad Sodagudi Suggested-by: Nathan Chancellor Reviewed-by: Fangrui Song Tested-by: Nathan Chancellor Acked-by: Peter Oberparleiter Reviewed-by: Nathan Chancellor Cc: [5.4+] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

init/gcov: allow CONFIG_CONSTRUCTORS on UML to fix module gcov

2021-02-05T19:03:47Z

On ARCH=um, loading a module doesn't result in its constructors getting called, which breaks module gcov since the debugfs files are never registered. On the other hand, in-kernel constructors have already been called by the dynamic linker, so we can't call them again. Get out of this conundrum by allowing CONFIG_CONSTRUCTORS to be selected, but avoiding the in-kernel constructor calls. Also remove the "if !UML" from GCOV selecting CONSTRUCTORS now, since we really do want CONSTRUCTORS, just not kernel binary ones. Link: https://lkml.kernel.org/r/20210120172041.c246a2cac2fb.I1358f584b76f1898373adfed77f4462c8705b736@changeid Signed-off-by: Johannes Berg Reviewed-by: Peter Oberparleiter Cc: Arnd Bergmann Cc: Jessica Yu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gcov: fix kernel-doc markup issue

2020-12-16T06:46:18Z

Fix the following kernel-doc issue in gcov: kernel/gcov/gcc_4_7.c:238: warning: Function parameter or member 'dst' not described in 'gcov_info_add' kernel/gcov/gcc_4_7.c:238: warning: Function parameter or member 'src' not described in 'gcov_info_add' kernel/gcov/gcc_4_7.c:238: warning: Excess function parameter 'dest' description in 'gcov_info_add' kernel/gcov/gcc_4_7.c:238: warning: Excess function parameter 'source' description in 'gcov_info_add' Link: https://lkml.kernel.org/r/1605252352-63983-1-git-send-email-alex.shi@linux.alibaba.com Signed-off-by: Alex Shi Acked-by: Peter Oberparleiter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gcov: remove support for GCC < 4.9

2020-12-16T06:46:18Z

Since commit 0bddd227f3dc ("Documentation: update for gcc 4.9 requirement") the minimum supported version of GCC is gcc-4.9. It's now safe to remove this code. Similar to commit 10415533a906 ("gcov: Remove old GCC 3.4 support") but that was for GCC 4.8 and this is for GCC 4.9. Link: https://github.com/ClangBuiltLinux/linux/issues/427 Link: https://lkml.kernel.org/r/20201111030557.2015680-1-ndesaulniers@google.com Signed-off-by: Nick Desaulniers Reviewed-by: Peter Oberparleiter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

gcov: add support for GCC 10.1

2020-09-11T16:33:54Z

Using gcov to collect coverage data for kernels compiled with GCC 10.1 causes random malfunctions and kernel crashes. This is the result of a changed GCOV_COUNTERS value in GCC 10.1 that causes a mismatch between the layout of the gcov_info structure created by GCC profiling code and the related structure used by the kernel. Fix this by updating the in-kernel GCOV_COUNTERS value. Also re-enable config GCOV_KERNEL for use with GCC 10. Reported-by: Colin Ian King Reported-by: Leon Romanovsky Signed-off-by: Peter Oberparleiter Tested-by: Leon Romanovsky Tested-and-Acked-by: Colin Ian King Signed-off-by: Linus Torvalds

gcov: Disable gcov build with GCC 10

2020-09-04T16:19:49Z

GCOV built with GCC 10 doesn't initialize n_function variable. This produces different kernel panics as was seen by Colin in Ubuntu and me in FC 32. As a workaround, let's disable GCOV build for broken GCC 10 version. Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891288 Link: https://lore.kernel.org/lkml/20200827133932.3338519-1-leon@kernel.org Link: https://lore.kernel.org/lkml/CAHk-=whbijeSdSvx-Xcr0DPMj0BiwhJ+uiNnDSVZcr_h_kg7UA@mail.gmail.com/ Cc: Colin Ian King Signed-off-by: Leon Romanovsky Signed-off-by: Linus Torvalds

treewide: replace '---help---' in Kconfig files with 'help'

2020-06-13T16:57:21Z

Since commit 84af7a6194e4 ("checkpatch: kconfig: prefer 'help' over '---help---'"), the number of '---help---' has been gradually decreasing, but there are still more than 2400 instances. This commit finishes the conversion. While I touched the lines, I also fixed the indentation. There are a variety of indentation styles found. a) 4 spaces + '---help---' b) 7 spaces + '---help---' c) 8 spaces + '---help---' d) 1 space + 1 tab + '---help---' e) 1 tab + '---help---' (correct indentation) f) 1 tab + 1 space + '---help---' g) 1 tab + 2 spaces + '---help---' In order to convert all of them to 1 tab + 'help', I ran the following commend: $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/' Signed-off-by: Masahiro Yamada