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| author | Marco Elver <elver@google.com> | 2021-06-07 14:56:51 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-07-20 13:49:43 -0700 |
| commit | 49f72d5358dd3c0d28bcd2232c513000b15480f0 (patch) | |
| tree | b837c0732cc8aa274ad60738a818491c71faad9f /lib | |
| parent | 08cac6049412061e571fadadc3e23464dc46d0f2 (diff) | |
| download | linux-49f72d5358dd3c0d28bcd2232c513000b15480f0.tar.gz linux-49f72d5358dd3c0d28bcd2232c513000b15480f0.tar.xz | |
kcsan: Rework atomic.h into permissive.h
Rework atomic.h into permissive.h to better reflect its purpose, and
introduce kcsan_ignore_address() and kcsan_ignore_data_race().
Introduce CONFIG_KCSAN_PERMISSIVE and update the stub functions in
preparation for subsequent changes.
As before, developers who choose to use KCSAN in "strict" mode will see
all data races and are not affected. Furthermore, by relying on the
value-change filter logic for kcsan_ignore_data_race(), even if the
permissive rules are enabled, the opt-outs in report.c:skip_report()
override them (such as for RCU-related functions by default).
The option CONFIG_KCSAN_PERMISSIVE is disabled by default, so that the
documented default behaviour of KCSAN does not change. Instead, like
CONFIG_KCSAN_IGNORE_ATOMICS, the option needs to be explicitly opted in.
Signed-off-by: Marco Elver <elver@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.kcsan | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Kconfig.kcsan b/lib/Kconfig.kcsan index c76fbb3ee09e..26f03c754d39 100644 --- a/lib/Kconfig.kcsan +++ b/lib/Kconfig.kcsan @@ -231,4 +231,14 @@ config KCSAN_IGNORE_ATOMICS due to two conflicting plain writes will be reported (aligned and unaligned, if CONFIG_KCSAN_ASSUME_PLAIN_WRITES_ATOMIC=n). +config KCSAN_PERMISSIVE + bool "Enable all additional permissive rules" + depends on KCSAN_REPORT_VALUE_CHANGE_ONLY + help + Enable additional permissive rules to ignore certain classes of data + races (also see kernel/kcsan/permissive.h). None of the permissive + rules imply that such data races are generally safe, but can be used + to further reduce reported data races due to data-racy patterns + common across the kernel. + endif # KCSAN |