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| author | Marco Elver <elver@google.com> | 2020-06-18 11:31:18 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-06-29 21:04:48 +0200 |
| commit | 61d56d7aa5eca3b909bce51ba8125b0fa44d7e17 (patch) | |
| tree | d3bf5b8c4209bbe7212524bf01418ea0b0c3d215 /kernel/kcsan/Makefile | |
| parent | kcsan: Simplify compiler flags (diff) | |
| download | linux-61d56d7aa5eca3b909bce51ba8125b0fa44d7e17.tar.xz linux-61d56d7aa5eca3b909bce51ba8125b0fa44d7e17.zip | |
kcsan: Disable branch tracing in core runtime
Disable branch tracing in core KCSAN runtime if branches are being
traced (TRACE_BRANCH_PROFILING). This it to avoid its performance
impact, but also avoid recursion in case KCSAN is enabled for the branch
tracing runtime.
The latter had already been a problem for KASAN:
https://lore.kernel.org/lkml/CANpmjNOeXmD5E3O50Z3MjkiuCYaYOPyi+1rq=GZvEKwBvLR0Ug@mail.gmail.com/
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/kcsan/Makefile')
| -rw-r--r-- | kernel/kcsan/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/kcsan/Makefile b/kernel/kcsan/Makefile index fea064afc4f7..65ca5539c470 100644 --- a/kernel/kcsan/Makefile +++ b/kernel/kcsan/Makefile @@ -8,7 +8,7 @@ CFLAGS_REMOVE_debugfs.o = $(CC_FLAGS_FTRACE) CFLAGS_REMOVE_report.o = $(CC_FLAGS_FTRACE) CFLAGS_core.o := $(call cc-option,-fno-conserve-stack) \ - -fno-stack-protector + -fno-stack-protector -DDISABLE_BRANCH_PROFILING obj-y := core.o debugfs.o report.o obj-$(CONFIG_KCSAN_SELFTEST) += selftest.o |