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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/ which disables recordmcount
tool if compiler supports -mrecord-mcount (s390 relies on combination
of -mhotpatch=0,3 gcc flag and

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/ | 9 +++------
9 files changed, 46 insertions(+), 22 deletions(-)


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