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loongarch: Provide noinstr sched_clock_read()

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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/20230519102715.502547082@infradead.org
This commit is contained in:
Peter Zijlstra 2023-05-19 12:21:03 +02:00
parent 24ee7607b2
commit 6b10fef09f
2 changed files with 4 additions and 4 deletions
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2
arch/loongarch/include/asm/loongarch.h
View file

@ -1167,7 +1167,7 @@ static __always_inline void iocsr_write64(u64 val, u32 reg)
#ifndef __ASSEMBLY__
static inline u64 drdtime(void)
static __always_inline u64 drdtime(void)
{
int rID = 0;
u64 val = 0;

6
arch/loongarch/kernel/time.c
View file

@ -190,9 +190,9 @@ static u64 read_const_counter(struct clocksource *clk)
return drdtime();
}
static u64 native_sched_clock(void)
static noinstr u64 sched_clock_read(void)
{
return read_const_counter(NULL);
return drdtime();
}
static struct clocksource clocksource_const = {
@ -211,7 +211,7 @@ int __init constant_clocksource_init(void)
res = clocksource_register_hz(&clocksource_const, freq);
sched_clock_register(native_sched_clock, 64, freq);
sched_clock_register(sched_clock_read, 64, freq);
pr_info("Constant clock source device register\n");