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sched/clock: Provide !HAVE_UNSTABLE_SCHED_CLOCK stub for sched_clock_stable()

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When CONFIG_HAVE_UNSTABLE_SCHED_CLOCK is disabled, sched_clock() is
already assumed to provide stable semantics, but the public header
doesn't provide a sched_clock_stable() stub for that case.

Add a header stub that always returns true and clean up the duplicate
local stub in ring_buffer.c, so callers can use sched_clock_stable()
unconditionally.

Signed-off-by: Yiyang Chen <cyyzero16@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Link: https://patch.msgid.link/56e45338858946cd9581b75c8bd45dd37dba52c5.1778773587.git.cyyzero16@gmail.com
This commit is contained in:
Yiyang Chen 2026-05-15 00:05:05 +08:00 committed by Peter Zijlstra
parent 95f44886af
commit ea19506013
2 changed files with 5 additions and 7 deletions
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5
include/linux/sched/clock.h
View File

@ -33,6 +33,11 @@ extern u64 sched_clock_cpu(int cpu);
extern void sched_clock_init(void);
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
static inline int sched_clock_stable(void)
{
return 1;
}
static inline void sched_clock_tick(void)
{
}

7
kernel/trace/ring_buffer.c
View File

@ -3769,13 +3769,6 @@ rb_add_time_stamp(struct ring_buffer_per_cpu *cpu_buffer,
return skip_time_extend(event);
}
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
static inline bool sched_clock_stable(void)
{
return true;
}
#endif
static void
rb_check_timestamp(struct ring_buffer_per_cpu *cpu_buffer,
struct rb_event_info *info)