diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2023-05-19 12:21:02 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-06-05 21:11:05 +0200 |
| commit | 24ee7607b286b44a5112ced38652df14cd80d5e2 (patch) | |
| tree | 4c91f31da9f727240a191af66cc90077bca3e648 /arch/arm64/include/asm/arch_timer.h | |
| parent | c1d26c0f0295953d35307f9ee07f3e5295741315 (diff) | |
arm64/arch_timer: Provide noinstr sched_clock_read() functions
With the intent to provide local_clock_noinstr(), a variant of
local_clock() that's safe to be called from noinstr code (with the
assumption that any such code will already be non-preemptible),
prepare for things by providing a noinstr sched_clock_read() function.
Specifically, preempt_enable_*() calls out to schedule(), which upsets
noinstr validation efforts.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com> # Hyper-V
Link: https://lore.kernel.org/r/20230519102715.435618812@infradead.org
Diffstat (limited to 'arch/arm64/include/asm/arch_timer.h')
| -rw-r--r-- | arch/arm64/include/asm/arch_timer.h | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h index af1fafbe7e1d..934c658ee947 100644 --- a/arch/arm64/include/asm/arch_timer.h +++ b/arch/arm64/include/asm/arch_timer.h @@ -88,13 +88,7 @@ static inline notrace u64 arch_timer_read_cntvct_el0(void) #define arch_timer_reg_read_stable(reg) \ ({ \ - u64 _val; \ - \ - preempt_disable_notrace(); \ - _val = erratum_handler(read_ ## reg)(); \ - preempt_enable_notrace(); \ - \ - _val; \ + erratum_handler(read_ ## reg)(); \ }) /* |