From: Benjamin Herrenschmidt <benh@kernel•crashing.org>
To: Preeti U Murthy <preeti@linux•vnet.ibm.com>
Cc: fweisbec@gmail•com, paul.gortmaker@windriver•com,
paulus@samba•org, shangw@linux•vnet.ibm.com, rjw@sisk•pl,
paulmck@linux•vnet.ibm.com, arnd@arndb•de,
linux-pm@vger•kernel.org, rostedt@goodmis•org,
john.stultz@linaro•org, tglx@linutronix•de,
chenhui.zhao@freescale•com, deepthi@linux•vnet.ibm.com,
r58472@freescale•com, geoff@infradead•org,
linux-kernel@vger•kernel.org, srivatsa.bhat@linux•vnet.ibm.com,
schwidefsky@de•ibm.com, linuxppc-dev@lists•ozlabs.org
Subject: Re: [RFC V2 PATCH 2/6] powerpc: Implement broadcast timer interrupt as an IPI message
Date: Thu, 22 Aug 2013 13:10:57 +1000 [thread overview]
Message-ID: <1377141057.25016.265.camel@pasglop> (raw)
In-Reply-To: <20130814115602.5193.60835.stgit@preeti.in.ibm.com>
On Wed, 2013-08-14 at 17:26 +0530, Preeti U Murthy wrote:
> -static irqreturn_t unused_action(int irq, void *data)
> +static irqreturn_t timer_action(int irq, void *data)
> {
> - /* This slot is unused and hence available for use, if needed
> */
> + timer_interrupt();
> return IRQ_HANDLED;
> }
>
That means we'll do irq_enter/irq_exit twice no ? And things like
may_hard_irq_enable() are also already done by do_IRQ so you
don't need timer_interrupt() to do it again.
We probably are better off breaking timer_interrupt in two:
void __timer_interrupt(struct pt_regs * regs)
Does the current stuff between irq_enter and irq_exit, timer_interrupt
does the remaining around it and calls __timer_interrupt.
Then from timer_action, you call __timer_interrupt()
Cheers,
Ben.
next prev parent reply other threads:[~2013-08-22 3:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-14 11:55 [RFC V2 PATCH 0/6] cpuidle/ppc: Timer offload framework to support deep idle states Preeti U Murthy
2013-08-14 11:55 ` [RFC V2 PATCH 1/6] powerpc: Free up the IPI message slot of ipi call function (PPC_MSG_CALL_FUNC) Preeti U Murthy
2013-08-14 11:56 ` [RFC V2 PATCH 2/6] powerpc: Implement broadcast timer interrupt as an IPI message Preeti U Murthy
2013-08-22 3:10 ` Benjamin Herrenschmidt [this message]
2013-08-22 5:49 ` Preeti U Murthy
2013-08-14 11:56 ` [RFC V2 PATCH 3/6] cpuidle/ppc: Add timer offload framework to support deep idle states Preeti U Murthy
2013-08-22 3:27 ` Benjamin Herrenschmidt
2013-08-22 9:03 ` Preeti U Murthy
2013-08-14 11:56 ` [RFC V2 PATCH 4/6] cpuidle/ppc: Add longnap state to the idle states on powernv Preeti U Murthy
2013-08-22 3:28 ` Benjamin Herrenschmidt
2013-08-22 9:09 ` Preeti U Murthy
2013-08-14 11:56 ` [RFC V2 PATCH 5/6] cpuidle/ppc: Enable dynamic movement of the broadcast functionality across CPUs Preeti U Murthy
2013-08-14 11:56 ` [RFC V2 PATCH 6/6] cpuidle/ppc : Queue a hrtimer on bc_cpu, explicitly to do broadcast handling Preeti U Murthy
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