arm64/arch_timer: Provide noinstr sched_clock_read() functions

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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

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Peter Zijlstra 2023-05-19 12:21:02 +02:00

parent c1d26c0f02

commit 24ee7607b2

2 changed files with 41 additions and 21 deletions

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8

arch/arm64/include/asm/arch_timer.h

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54

drivers/clocksource/arm_arch_timer.c

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