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Thu, 14 May 2026 09:05:13 -0700 (PDT) Received: from ubuntu24.lan ([14.146.38.107]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83f24cd0422sm3358943b3a.18.2026.05.14.09.05.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2026 09:05:12 -0700 (PDT) From: Yiyang Chen To: peterz@infradead.org, rostedt@goodmis.org Cc: mingo@redhat.com, vincent.guittot@linaro.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yiyang Chen Subject: [PATCH] sched/clock: Provide !HAVE_UNSTABLE_SCHED_CLOCK stub for sched_clock_stable() Date: Fri, 15 May 2026 00:05:05 +0800 Message-ID: <56e45338858946cd9581b75c8bd45dd37dba52c5.1778773587.git.cyyzero16@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- include/linux/sched/clock.h | 5 +++++ kernel/trace/ring_buffer.c | 7 ------- 2 files changed, 5 insertions(+), 7 deletions(-) diff --git a/include/linux/sched/clock.h b/include/linux/sched/clock.h index 196f0ca351a2..39f0a7f94bfc 100644 --- a/include/linux/sched/clock.h +++ b/include/linux/sched/clock.h @@ -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) { } diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 5326924615a4..02691c3c6dd6 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -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) -- 2.43.0