linux-kernel - [PATCH v2 0/2] gcov fixes for clang-11

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Date:   Fri, 12 Mar 2021 14:41:30 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Fangrui Song <maskray@...gle.com>,
        Prasad Sodagudi <psodagud@...cinc.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH v2 0/2] gcov fixes for clang-11

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.

The first patch should allow us to backport it to stable; the second
drops support for older toolchains.

Link: https://reviews.llvm.org/rGcdd683b516d147925212724b09ec6fb792a40041
Link: https://reviews.llvm.org/rG13a633b438b6500ecad9e4f936ebadf3411d0f44

Nick Desaulniers (2):
  gcov: fix clang-11+ support
  gcov: clang: drop support for clang-10 and older

 kernel/gcov/Kconfig |  1 +
 kernel/gcov/clang.c | 32 ++++++++------------------------
 2 files changed, 9 insertions(+), 24 deletions(-)

base-commit: f78d76e72a4671ea52d12752d92077788b4f5d50
-- 
2.31.0.rc2.261.g7f71774620-goog