From: John Stultz <john.stultz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> To: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org> Cc: Daniel Lezcano <daniel.lezcano-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>, Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>, "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, "linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> Subject: Re: [PATCH] arch_timer: Do not register arch_sys_counter twice Date: Tue, 15 Oct 2013 09:46:19 -0700 [thread overview] Message-ID: <525D715B.5090203@linaro.org> (raw) In-Reply-To: <20131015150314.GA10535-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org> On 10/15/2013 08:03 AM, Thierry Reding wrote: > On Tue, Oct 15, 2013 at 03:23:14PM +0100, Will Deacon wrote: >> On Tue, Oct 15, 2013 at 02:31:51PM +0100, Thierry Reding wrote: >>> Commit 65cd4f6 (arch_timer: Move to generic sched_clock framework) added >>> code to register the arch_sys_counter in arch_timer_register() but it is >>> already registered in arch_counter_register(). This results in the timer >>> being added to the clocksource list twice, therefore causing an infinite >>> loop in the list. >>> >>> Remove the duplicate registration and register the scheduler clock after >>> the original registration instead. >>> >>> This fixes a hang during boot on Tegra114 (Cortex-A15). >>> >>> Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> >>> --- >>> While I've only tested this on Tegra114, I suspect the same hang during >>> boot happens for all processors that use this clock source. >>> >>> drivers/clocksource/arm_arch_timer.c | 12 +++--------- >>> 1 file changed, 3 insertions(+), 9 deletions(-) >>> >>> diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c >>> index f655036..95fb944 100644 >>> --- a/drivers/clocksource/arm_arch_timer.c >>> +++ b/drivers/clocksource/arm_arch_timer.c >>> @@ -436,6 +436,9 @@ static void __init arch_counter_register(unsigned type) >>> cyclecounter.mult = clocksource_counter.mult; >>> cyclecounter.shift = clocksource_counter.shift; >>> timecounter_init(&timecounter, &cyclecounter, start_count); >>> + >>> + /* 56 bits minimum, so we assume worst case rollover */ >>> + sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); >>> } >>> >>> static void arch_timer_stop(struct clock_event_device *clk) >>> @@ -515,15 +518,6 @@ static int __init arch_timer_register(void) >>> goto out; >>> } >>> >>> - clocksource_register_hz(&clocksource_counter, arch_timer_rate); >>> - cyclecounter.mult = clocksource_counter.mult; >>> - cyclecounter.shift = clocksource_counter.shift; >>> - timecounter_init(&timecounter, &cyclecounter, >>> - arch_counter_get_cntvct()); >>> - >>> - /* 56 bits minimum, so we assume worst case rollover */ >>> - sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); >>> - >>> if (arch_timer_use_virtual) { >>> ppi = arch_timer_ppi[VIRT_PPI]; >>> err = request_percpu_irq(ppi, arch_timer_handler_virt, >> >> Excuse my ignorance, but I'm failing to apply either this patch or the one >> that Stephen Boyd proposed: >> >> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-October/204665.html > > Hehe, that patch is exactly the same as this one. =) > >> The second hunk (deletions) doesn't apply at all, and if I just apply the >> first hunk then things won't compile. Which tree is this against? The problem is from my merge to -tip. > > This is on top of today's linux-next[0] and will probably apply to > yesterday's linux-next too. I think that perhaps the patch or the one > that Stephen proposed himself should be squashed with the original > because that caused the breakage in the first place. From what I gather > from the mailing thread you linked to above it seems like John took an > earlier patch from Stephen and rebased it on top of something more > recent and that didn't work out as expected. Yes, again my apologies. When I applied Stephen's original patch to the recent tree, I mis-resolved the conflict. > Ingo, any chance you could take this patch and squash it into the patch > mentioned above? Applying it as a separate fix will break bisectability > inbetween both patches. I suspect Ingo won't squish down the fix onto the misresolved patch, since -tip usually preserves history. But hopefully we can get this merged quickly. Again, sorry for the trouble! -john
WARNING: multiple messages have this Message-ID (diff)
From: john.stultz@linaro.org (John Stultz) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] arch_timer: Do not register arch_sys_counter twice Date: Tue, 15 Oct 2013 09:46:19 -0700 [thread overview] Message-ID: <525D715B.5090203@linaro.org> (raw) In-Reply-To: <20131015150314.GA10535@ulmo.nvidia.com> On 10/15/2013 08:03 AM, Thierry Reding wrote: > On Tue, Oct 15, 2013 at 03:23:14PM +0100, Will Deacon wrote: >> On Tue, Oct 15, 2013 at 02:31:51PM +0100, Thierry Reding wrote: >>> Commit 65cd4f6 (arch_timer: Move to generic sched_clock framework) added >>> code to register the arch_sys_counter in arch_timer_register() but it is >>> already registered in arch_counter_register(). This results in the timer >>> being added to the clocksource list twice, therefore causing an infinite >>> loop in the list. >>> >>> Remove the duplicate registration and register the scheduler clock after >>> the original registration instead. >>> >>> This fixes a hang during boot on Tegra114 (Cortex-A15). >>> >>> Signed-off-by: Thierry Reding <treding@nvidia.com> >>> --- >>> While I've only tested this on Tegra114, I suspect the same hang during >>> boot happens for all processors that use this clock source. >>> >>> drivers/clocksource/arm_arch_timer.c | 12 +++--------- >>> 1 file changed, 3 insertions(+), 9 deletions(-) >>> >>> diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c >>> index f655036..95fb944 100644 >>> --- a/drivers/clocksource/arm_arch_timer.c >>> +++ b/drivers/clocksource/arm_arch_timer.c >>> @@ -436,6 +436,9 @@ static void __init arch_counter_register(unsigned type) >>> cyclecounter.mult = clocksource_counter.mult; >>> cyclecounter.shift = clocksource_counter.shift; >>> timecounter_init(&timecounter, &cyclecounter, start_count); >>> + >>> + /* 56 bits minimum, so we assume worst case rollover */ >>> + sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); >>> } >>> >>> static void arch_timer_stop(struct clock_event_device *clk) >>> @@ -515,15 +518,6 @@ static int __init arch_timer_register(void) >>> goto out; >>> } >>> >>> - clocksource_register_hz(&clocksource_counter, arch_timer_rate); >>> - cyclecounter.mult = clocksource_counter.mult; >>> - cyclecounter.shift = clocksource_counter.shift; >>> - timecounter_init(&timecounter, &cyclecounter, >>> - arch_counter_get_cntvct()); >>> - >>> - /* 56 bits minimum, so we assume worst case rollover */ >>> - sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate); >>> - >>> if (arch_timer_use_virtual) { >>> ppi = arch_timer_ppi[VIRT_PPI]; >>> err = request_percpu_irq(ppi, arch_timer_handler_virt, >> >> Excuse my ignorance, but I'm failing to apply either this patch or the one >> that Stephen Boyd proposed: >> >> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-October/204665.html > > Hehe, that patch is exactly the same as this one. =) > >> The second hunk (deletions) doesn't apply at all, and if I just apply the >> first hunk then things won't compile. Which tree is this against? The problem is from my merge to -tip. > > This is on top of today's linux-next[0] and will probably apply to > yesterday's linux-next too. I think that perhaps the patch or the one > that Stephen proposed himself should be squashed with the original > because that caused the breakage in the first place. From what I gather > from the mailing thread you linked to above it seems like John took an > earlier patch from Stephen and rebased it on top of something more > recent and that didn't work out as expected. Yes, again my apologies. When I applied Stephen's original patch to the recent tree, I mis-resolved the conflict. > Ingo, any chance you could take this patch and squash it into the patch > mentioned above? Applying it as a separate fix will break bisectability > inbetween both patches. I suspect Ingo won't squish down the fix onto the misresolved patch, since -tip usually preserves history. But hopefully we can get this merged quickly. Again, sorry for the trouble! -john
next prev parent reply other threads:[~2013-10-15 16:46 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-10-15 13:31 [PATCH] arch_timer: Do not register arch_sys_counter twice Thierry Reding 2013-10-15 13:31 ` Thierry Reding [not found] ` <1381843911-31962-1-git-send-email-treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> 2013-10-15 14:23 ` Will Deacon 2013-10-15 14:23 ` Will Deacon [not found] ` <20131015142313.GC850-MRww78TxoiP5vMa5CHWGZ34zcgK1vI+I0E9HWUfgJXw@public.gmane.org> 2013-10-15 15:03 ` Thierry Reding 2013-10-15 15:03 ` Thierry Reding [not found] ` <20131015150314.GA10535-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org> 2013-10-15 16:46 ` John Stultz [this message] 2013-10-15 16:46 ` John Stultz 2013-10-15 16:51 ` John Stultz 2013-10-15 16:51 ` John Stultz 2013-10-17 16:49 ` [tip:timers/core] clocksource: " tip-bot for Thierry Reding
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