xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge branch 'kcsan-for-tip' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into locking/kcsan

Browse Source 
Pull KCSAN updates from Paul McKenney.
This commit is contained in:
Thomas Gleixner
2020-05-08 14:58:28 +02:00
parent 3b02a051d2 50a19ad4b1
commit 97a9474aeb
13 changed files with 883 additions and 401 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
lib/Kconfig.kcsan
View File

@@ -4,22 +4,36 @@ config HAVE_ARCH_KCSAN
bool
menuconfig KCSAN
bool "KCSAN: dynamic race detector"
bool "KCSAN: dynamic data race detector"
depends on HAVE_ARCH_KCSAN && DEBUG_KERNEL && !KASAN
select STACKTRACE
help
The Kernel Concurrency Sanitizer (KCSAN) is a dynamic race detector,
which relies on compile-time instrumentation, and uses a
watchpoint-based sampling approach to detect races.
The Kernel Concurrency Sanitizer (KCSAN) is a dynamic
data-race detector that relies on compile-time instrumentation.
KCSAN uses a watchpoint-based sampling approach to detect races.
KCSAN's primary purpose is to detect data races. KCSAN can also be
used to check properties, with the help of provided assertions, of
concurrent code where bugs do not manifest as data races.
While KCSAN's primary purpose is to detect data races, it
also provides assertions to check data access constraints.
These assertions can expose bugs that do not manifest as
data races.
See <file:Documentation/dev-tools/kcsan.rst> for more details.
if KCSAN
config KCSAN_VERBOSE
bool "Show verbose reports with more information about system state"
depends on PROVE_LOCKING
help
If enabled, reports show more information about the system state that
may help better analyze and debug races. This includes held locks and
IRQ trace events.
While this option should generally be benign, we call into more
external functions on report generation; if a race report is
generated from any one of them, system stability may suffer due to
deadlocks or recursion. If in doubt, say N.
config KCSAN_DEBUG
bool "Debugging of KCSAN internals"
@@ -88,6 +102,17 @@ config KCSAN_SKIP_WATCH_RANDOMIZE
KCSAN_WATCH_SKIP. If false, the chosen value is always
KCSAN_WATCH_SKIP.
config KCSAN_INTERRUPT_WATCHER
bool "Interruptible watchers"
help
If enabled, a task that set up a watchpoint may be interrupted while
delayed. This option will allow KCSAN to detect races between
interrupted tasks and other threads of execution on the same CPU.
Currently disabled by default, because not all safe per-CPU access
primitives and patterns may be accounted for, and therefore could
result in false positives.
config KCSAN_REPORT_ONCE_IN_MS
int "Duration in milliseconds, in which any given race is only reported once"
default 3000