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Date: Thu, 13 Feb 2020 09:25:19 +1100 (AEDT) From: Finn Thain <fthain@...egraphics.com.au> To: afzal mohammed <afzal.mohd.ma@...il.com> cc: linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org, Greg Ungerer <gerg@...ux-m68k.org>, Thomas Gleixner <tglx@...utronix.de>, Geert Uytterhoeven <geert@...ux-m68k.org> Subject: Re: [PATCH 06/18] m68k: Replace setup_irq() by request_irq() On Wed, 12 Feb 2020, afzal mohammed wrote: > request_irq() is preferred over setup_irq(). Existing callers of > setup_irq() reached mostly via 'init_IRQ()' & 'time_init()', while > memory allocators are ready by 'mm_init()'. > > Per tglx[1], setup_irq() existed in olden days when allocators were not > ready by the time early interrupts were initialized. > > Hence replace setup_irq() by request_irq(). > > Seldom remove_irq() usage has been observed coupled with setup_irq(), > wherever that has been found, it too has been replaced by free_irq(). > > [1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos > > Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com> > --- > > Since cc'ing cover letter to all maintainers/reviewers would be too > many, refer for cover letter, > https://lkml.kernel.org/r/cover.1581478323.git.afzal.mohd.ma@gmail.com > > arch/m68k/68000/timers.c | 9 ++------- > arch/m68k/coldfire/pit.c | 9 ++------- > arch/m68k/coldfire/sltimers.c | 19 +++++-------------- > arch/m68k/coldfire/timers.c | 19 +++++-------------- > 4 files changed, 14 insertions(+), 42 deletions(-) > > diff --git a/arch/m68k/68000/timers.c b/arch/m68k/68000/timers.c > index 71ddb4c98726..7a55d664592e 100644 > --- a/arch/m68k/68000/timers.c > +++ b/arch/m68k/68000/timers.c > @@ -68,12 +68,6 @@ static irqreturn_t hw_tick(int irq, void *dummy) > > /***************************************************************************/ > > -static struct irqaction m68328_timer_irq = { > - .name = "timer", > - .flags = IRQF_TIMER, > - .handler = hw_tick, > -}; > - > /***************************************************************************/ > > static u64 m68328_read_clk(struct clocksource *cs) > @@ -106,7 +100,8 @@ void hw_timer_init(irq_handler_t handler) > TCTL = 0; > > /* set ISR */ > - setup_irq(TMR_IRQ_NUM, &m68328_timer_irq); > + if (request_irq(TMR_IRQ_NUM, hw_tick, IRQF_TIMER, "timer", NULL)) > + pr_err("request_irq() on %s failed\n", "timer"); "request_irq() on timer failed" is bad grammar and doesn't convey what went wrong. It could be taken to mean that request_irq() was called because a timer went off. Have you considered, pr_err("%s: request_irq() failed\n", "timer"); I think that would be more typical of error messages on UNIX. E.g. $ grep x -- /tmp/foo grep: /tmp/foo: No such file or directory > > /* Restart mode, Enable int, Set clock source */ > TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE; > diff --git a/arch/m68k/coldfire/pit.c b/arch/m68k/coldfire/pit.c > index eb6f16b0e2e6..d09e253abe5a 100644 > --- a/arch/m68k/coldfire/pit.c > +++ b/arch/m68k/coldfire/pit.c > @@ -111,12 +111,6 @@ static irqreturn_t pit_tick(int irq, void *dummy) > > /***************************************************************************/ > > -static struct irqaction pit_irq = { > - .name = "timer", > - .flags = IRQF_TIMER, > - .handler = pit_tick, > -}; > - > /***************************************************************************/ > > static u64 pit_read_clk(struct clocksource *cs) > @@ -156,7 +150,8 @@ void hw_timer_init(irq_handler_t handler) > cf_pit_clockevent.min_delta_ticks = 0x3f; > clockevents_register_device(&cf_pit_clockevent); > > - setup_irq(MCF_IRQ_PIT1, &pit_irq); > + if (request_irq(MCF_IRQ_PIT1, pit_tick, IRQF_TIMER, "timer", NULL)) > + pr_err("request_irq() on %s failed\n", "timer"); > Same here. > clocksource_register_hz(&pit_clk, FREQ); > } > diff --git a/arch/m68k/coldfire/sltimers.c b/arch/m68k/coldfire/sltimers.c > index 1b11e7bacab3..2188a21e5413 100644 > --- a/arch/m68k/coldfire/sltimers.c > +++ b/arch/m68k/coldfire/sltimers.c > @@ -50,18 +50,14 @@ irqreturn_t mcfslt_profile_tick(int irq, void *dummy) > return IRQ_HANDLED; > } > > -static struct irqaction mcfslt_profile_irq = { > - .name = "profile timer", > - .flags = IRQF_TIMER, > - .handler = mcfslt_profile_tick, > -}; > - > void mcfslt_profile_init(void) > { > printk(KERN_INFO "PROFILE: lodging TIMER 1 @ %dHz as profile timer\n", > PROFILEHZ); > > - setup_irq(MCF_IRQ_PROFILER, &mcfslt_profile_irq); > + if (request_irq(MCF_IRQ_PROFILER, mcfslt_profile_tick, IRQF_TIMER, > + "profile timer", NULL)) > + pr_err("request_irq() on %s failed\n", "profile timer"); > And here. > /* Set up TIMER 2 as high speed profile clock */ > __raw_writel(MCF_BUSCLK / PROFILEHZ - 1, PA(MCFSLT_STCNT)); > @@ -92,12 +88,6 @@ static irqreturn_t mcfslt_tick(int irq, void *dummy) > return timer_interrupt(irq, dummy); > } > > -static struct irqaction mcfslt_timer_irq = { > - .name = "timer", > - .flags = IRQF_TIMER, > - .handler = mcfslt_tick, > -}; > - > static u64 mcfslt_read_clk(struct clocksource *cs) > { > unsigned long flags; > @@ -140,7 +130,8 @@ void hw_timer_init(irq_handler_t handler) > mcfslt_cnt = mcfslt_cycles_per_jiffy; > > timer_interrupt = handler; > - setup_irq(MCF_IRQ_TIMER, &mcfslt_timer_irq); > + if (request_irq(MCF_IRQ_TIMER, mcfslt_tick, IRQF_TIMER, "timer", NULL)) > + pr_err("request_irq() on %s failed\n", "timer"); > And so on. > clocksource_register_hz(&mcfslt_clk, MCF_BUSCLK); > > diff --git a/arch/m68k/coldfire/timers.c b/arch/m68k/coldfire/timers.c > index 227aa5d13709..f384e92d8b1c 100644 > --- a/arch/m68k/coldfire/timers.c > +++ b/arch/m68k/coldfire/timers.c > @@ -82,12 +82,6 @@ static irqreturn_t mcftmr_tick(int irq, void *dummy) > > /***************************************************************************/ > > -static struct irqaction mcftmr_timer_irq = { > - .name = "timer", > - .flags = IRQF_TIMER, > - .handler = mcftmr_tick, > -}; > - > /***************************************************************************/ > > static u64 mcftmr_read_clk(struct clocksource *cs) > @@ -134,7 +128,8 @@ void hw_timer_init(irq_handler_t handler) > > timer_interrupt = handler; > init_timer_irq(); > - setup_irq(MCF_IRQ_TIMER, &mcftmr_timer_irq); > + if (request_irq(MCF_IRQ_TIMER, mcftmr_tick, IRQF_TIMER, "timer", NULL)) > + pr_err("request_irq() on %s failed\n", "timer"); > > #ifdef CONFIG_HIGHPROFILE > coldfire_profile_init(); > @@ -170,12 +165,6 @@ irqreturn_t coldfire_profile_tick(int irq, void *dummy) > > /***************************************************************************/ > > -static struct irqaction coldfire_profile_irq = { > - .name = "profile timer", > - .flags = IRQF_TIMER, > - .handler = coldfire_profile_tick, > -}; > - > void coldfire_profile_init(void) > { > printk(KERN_INFO "PROFILE: lodging TIMER2 @ %dHz as profile timer\n", > @@ -188,7 +177,9 @@ void coldfire_profile_init(void) > __raw_writew(MCFTIMER_TMR_ENORI | MCFTIMER_TMR_CLK16 | > MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENABLE, PA(MCFTIMER_TMR)); > > - setup_irq(MCF_IRQ_PROFILER, &coldfire_profile_irq); > + if (request_irq(MCF_IRQ_PROFILER, coldfire_profile_tick, IRQF_TIMER, > + "profile timer", NULL)) > + pr_err("request_irq() on %s failed\n", "profile timer"); > } > > /***************************************************************************/ >
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