linux-kernel - Re: [PATCH -v5 09/11] tracing: add IRQENTRY

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Date:	Tue, 27 Oct 2009 18:39:12 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	wuzhangjin@...il.com
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, Thomas Gleixner <tglx@...utronix.de>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Nicholas Mc Guire <der.herr@...r.at>,
	Richard Sandiford <rdsandiford@...glemail.com>,
	David Daney <ddaney@...iumnetworks.com>,
	Adam Nemet <anemet@...iumnetworks.com>,
	Patrik Kluba <kpajko79@...il.com>
Subject: Re: [PATCH -v5 09/11] tracing: add IRQENTRY_EXIT for MIPS

2009/10/26 Wu Zhangjin <wuzhangjin@...il.com>:
> ooh, Sorry, only this patch added(I stopped after fixing the compiling
> errors, no more check! so lazy a guy!).
>
> Just checked the source code of MIPS, the do_IRQ() is defined as a
> macro, so, I must move the macro to a C file, and also, there is a
> irq_enter...irq_exit block in a "big" function, I need to split it out.
>
> [...]
> /*
>  * do_IRQ handles all normal device IRQ's (the special
>  * SMP cross-CPU interrupts have their own specific
>  * handlers).
>  *
>  * Ideally there should be away to get this into kernel/irq/handle.c to
>  * avoid the overhead of a call for just a tiny function ...
>  */
> #define do_IRQ(irq)
> \
> do {
> \
>        irq_enter();
> \
>        __DO_IRQ_SMTC_HOOK(irq);
> \
>        generic_handle_irq(irq);
> \
>        irq_exit();
> \
> } while (0)
> [...]
>
> But The comment told us: do not make this tiny function be a standalone
> function, so???


I can't check that currently. But may be the caller of this m


>
> the same to do_IRQ_no_affinity.
>
> and, about the following function, I need to split the
> irq_enter()...irq_exit() block out.
>
> void ipi_decode(struct smtc_ipi *pipi)
> {
>        [...]
>        switch (type_copy) {
>        case SMTC_CLOCK_TICK:
>                irq_enter();
>                kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq));
>                cd = &per_cpu(mips_clockevent_device, cpu);
>                cd->event_handler(cd);
>                irq_exit();
>                break;
>
>        case LINUX_SMP_IPI:
>                switch ((int)arg_copy) {
>                case SMP_RESCHEDULE_YOURSELF:
>                        ipi_resched_interrupt();
>                        break;
>                case SMP_CALL_FUNCTION:
>                        ipi_call_interrupt();
>                        break;
>        [...]
>
> Regards,
>        Wu Zhangjin
>
>
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