[PATCH v3 0/3] gcov: add Clang support

[Tri Vo <trong@android.com>]

This patch series adds Clang supoprt for gcov.

Patch 1 refactors existing code in preparation for Clang support.
Patch 2 implements necessary LLVM runtime hooks and gcov kernel interfaces.
Patch 3 updates documentation.

Greg Hackmann (2):
  gcov: Clang: move common GCC code into gcc_base.c
  gcov: Clang support

Tri Vo (1):
  gcov: docs: add a note on GCC vs Clang differences

 Documentation/dev-tools/gcov.rst |  18 +-
 kernel/gcov/Kconfig              |   3 +-
 kernel/gcov/Makefile             |   5 +-
 kernel/gcov/base.c               |  84 +----
 kernel/gcov/clang.c              | 555 +++++++++++++++++++++++++++++++
 kernel/gcov/gcc_base.c           |  86 +++++
 kernel/gcov/gcov.h               |   3 +
 7 files changed, 665 insertions(+), 89 deletions(-)
 create mode 100644 kernel/gcov/clang.c
 create mode 100644 kernel/gcov/gcc_base.c

v2:
- Reorganized config dependencies, as per Masahiro.

v3:
- Squashed patches 2-4 of v2, as per Nick, Masahiro, and Peter.
Addressed comments by Peter:
- Moved __gcov_exit() to gcc_base.c
- Added missing header to gcc_base.c
- Removed unnecessary boundary checks in gcov_info_add().
- Changed counters' allocation to use vmalloc().
- Added check for failed allocation of filename.
- Changed list_for_each_entry_safe to list_for_each_entry when traversing
  without modifying.
- Updated Documentation/dev-tools/gcov.rst

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2.20.1.321.g9e740568ce-goog