linux-kernel - [PATCH 0/4] ftrace build improvements

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Date:   Mon, 6 Aug 2018 15:17:41 +0200
From:   Vasily Gorbik <gor@...ux.ibm.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 0/4] ftrace build improvements

Support for -fentry -mrecord-mcount and -mnop-mcount has been added for
s390 in gcc master branch. An attempt to build 4.18 for s390 with that
gcc would produce a kernel with no __mcount_loc though because of the
new condition in scripts/Makefile.build:210 which disables recordmcount
tool if compiler supports -mrecord-mcount (s390 relies on combination
of -mhotpatch=0,3 gcc flag and recordmcount.pl).

This patch series adds s390 ftrace support based on combination of -pg
-fentry -mrecord-mcount and -mnop-mcount gcc flags (that fixes issue
mentioned above). At the same time this patch series fixes couple of
minor issues and adds -mnop-mcount gcc flag support (utilized by s390).

Vasily Gorbik (4):
  trace: handle CC_FLAGS_FTRACE more accurately
  trace: avoid calling cc-option -mrecord-mcount for every Makefile
  trace: add -mcount-nop option support
  s390/ftrace: add -mfentry and -mnop-mcount support

 Makefile                       | 24 ++++++++++++++++++++----
 arch/s390/Kconfig              |  2 ++
 arch/s390/Makefile             | 16 +++++++++-------
 arch/s390/include/asm/ftrace.h |  6 +++---
 arch/s390/kernel/ftrace.c      |  2 +-
 arch/s390/kernel/mcount.S      |  2 +-
 kernel/trace/Kconfig           |  5 +++++
 kernel/trace/ftrace.c          |  2 ++
 scripts/Makefile.build         |  9 +++------
 9 files changed, 46 insertions(+), 22 deletions(-)

-- 
2.18.0.13.gd42ae10