From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven Rostedt <rostedt@goodmis.org>
Date: Sat, 08 Oct 2022 19:34:42 +0000
Subject: Re: [RFC PATCH 4/5] irq_work: Trace calls to arch_irq_work_raise()
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References: <20221007154145.1877054-1-vschneid@redhat.com>
	<20221007154533.1878285-4-vschneid@redhat.com>
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To: Valentin Schneider <vschneid@redhat.com>
Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, x86@kernel.org, "Paul E. McKenney" <paulmck@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Thomas Gleixner <tglx@linutronix.de>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Juri Lelli <juri.lelli@redhat.com>, Daniel Bristot de Oliveira <bristot@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Frederic Weisbecker <frederic@kernel.org>, Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, "H. Peter Anvin" <hpa@zytor.com>, Marc Zyngier <maz@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Russell King <linux@armlinux.org.uk>, Nicholas Piggin <npiggin@gmail.com>, Guo Ren <guoren@kernel.org>, "David S.
 Miller" <davem@davemloft.net>

On Fri,  7 Oct 2022 16:45:32 +0100
Valentin Schneider <vschneid@redhat.com> wrote:
>  }
>  
> +static inline void irq_work_raise(void)
> +{
> +	if (arch_irq_work_has_interrupt())
> +		trace_ipi_send_cpu(_RET_IP_, smp_processor_id());

To save on the branch, let's make the above:

	if (trace_ipi_send_cpu_enabled() && arch_irq_work_has_interrupt())

As the "trace_*_enabled()" is a static branch that will make it a nop
when the tracepoint is not enabled.

-- Steve


> +
> +	arch_irq_work_raise();
> +}
> +
>  /* Enqueue on current CPU, work must already be claimed and preempt disabled */