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| author | Rohan McLure <rmclure@linux.ibm.com> | 2023-02-06 13:17:58 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-02-10 22:19:56 +1100 |
| commit | 2a7ce82dc46c591c9244057d89a6591c9639b9b9 (patch) | |
| tree | b974bee0b27aae9971095592dcbd58572c2728e9 /arch/powerpc/kernel/time.c | |
| parent | 2fb857bc9f9e106439017ed323f522cc785395bb (diff) | |
| download | lwn-2a7ce82dc46c591c9244057d89a6591c9639b9b9.tar.gz lwn-2a7ce82dc46c591c9244057d89a6591c9639b9b9.zip | |
powerpc/kcsan: Exclude udelay to prevent recursive instrumentation
In order for KCSAN to increase its likelihood of observing a data race,
it sets a watchpoint on memory accesses and stalls, allowing for
detection of conflicting accesses by other kernel threads or interrupts.
Stalls are implemented by injecting a call to udelay in instrumented code.
To prevent recursive instrumentation, exclude udelay from being instrumented.
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230206021801.105268-3-rmclure@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/time.c')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index d68de3618741..b894029f53db 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -356,7 +356,7 @@ void vtime_flush(struct task_struct *tsk) } #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ -void __delay(unsigned long loops) +void __no_kcsan __delay(unsigned long loops) { unsigned long start; @@ -377,7 +377,7 @@ void __delay(unsigned long loops) } EXPORT_SYMBOL(__delay); -void udelay(unsigned long usecs) +void __no_kcsan udelay(unsigned long usecs) { __delay(tb_ticks_per_usec * usecs); } |