From: Steven Rostedt <rostedt@goodmis.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: quanyang.wang@windriver.com, linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Leo Yan <leo.yan@linaro.org>, Will Deacon <will@kernel.org>,
a.darwish@linutronix.de,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Paul Cercueil <paul@crapouillou.net>,
Randy Dunlap <rdunlap@infradead.org>,
ben.dooks@codethink.co.uk
Subject: Re: [PATCH] time/sched_clock: mark sched_clock_read_begin as notrace
Date: Mon, 28 Sep 2020 17:33:31 -0400 [thread overview]
Message-ID: <20200928173331.3ea3cfb7@oasis.local.home> (raw)
In-Reply-To: <20200928105859.GF2628@hirez.programming.kicks-ass.net>
On Mon, 28 Sep 2020 12:58:59 +0200
Peter Zijlstra <peterz@infradead.org> wrote:
> > -struct clock_read_data *sched_clock_read_begin(unsigned int *seq)
> > +notrace struct clock_read_data *sched_clock_read_begin(unsigned int *seq)
> > {
> > *seq = raw_read_seqcount_latch(&cd.seq);
> > return cd.read_data + (*seq & 1);
>
> At the very least sched_clock_read_retry() should also be marked such.
>
> But Steve, how come x86 works? Our sched_clock() doesn't have notrace on
> at all.
It's because of that magic in the Makefile that you love so much ;-)
CFLAGS_REMOVE_tsc.o = -pg
-- Steve
next prev parent reply other threads:[~2020-09-28 21:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 10:49 quanyang.wang
2020-09-28 10:58 ` Peter Zijlstra
2020-09-28 12:41 ` Quanyang Wang
2020-09-28 21:33 ` Steven Rostedt [this message]
2020-09-29 7:13 ` Peter Zijlstra
2020-09-29 14:43 ` Steven Rostedt
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