From: Max Filippov <jcmvbkbc@gmail.com>
To: Chris Zankel <chris@zankel.net>
Cc: Marc Gauthier <marc@tensilica.com>,
linux-xtensa@linux-xtensa.org, linux-arch@vger.kernel.org,
Max Filippov <jcmvbkbc@gmail.com>
Subject: [PATCH 13/17] xtensa: clear timer IRQ unconditionally in its handler
Date: Thu, 17 Oct 2013 02:42:24 +0400 [thread overview]
Message-ID: <1381963348-29448-14-git-send-email-jcmvbkbc@gmail.com> (raw)
In-Reply-To: <1381963348-29448-1-git-send-email-jcmvbkbc@gmail.com>
PIC irq_ack doesn't clear timer IRQ, because timer interrupt handler
usually set up new timer by writing to ccompare register and thus
clearing timer IRQ. However timer may not be set up in the IRQ handler,
e.g. with tickless idle on SMP, or when CPU is going offline, leaving
timer IRQ raised and making do_interrupt attempting to handle it
forever.
To fix this always write current value of ccompare SR chosen to be linux
timer back to that SR on entry to timer interrupt handler.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
arch/xtensa/kernel/time.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c
index 4ce7aae..60dcb3f 100644
--- a/arch/xtensa/kernel/time.c
+++ b/arch/xtensa/kernel/time.c
@@ -158,6 +158,7 @@ irqreturn_t timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = &this_cpu_ptr(&ccount_timer)->evt;
+ set_linux_timer(get_linux_timer());
evt->event_handler(evt);
/* Allow platform to do something useful (Wdog). */
--
1.8.1.4
next prev parent reply other threads:[~2013-10-16 22:43 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-16 22:42 [PATCH 00/17] xtensa SMP queue Max Filippov
2013-10-16 22:42 ` [PATCH 01/17] xtensa: remove NO_IRQ definitions Max Filippov
2013-10-16 22:42 ` [PATCH 02/17] xtensa: fix build warning in 64-bit build environment Max Filippov
2013-10-16 22:42 ` [PATCH 03/17] xtensa: fix build warning from gcc-4.7.2 Max Filippov
2013-10-16 22:42 ` [PATCH 04/17] xtensa: fix arch spinlock function names Max Filippov
2013-10-16 22:42 ` [PATCH 05/17] xtensa: fix __delay for small loop count Max Filippov
2013-10-16 22:42 ` [PATCH 06/17] xtensa: enable HAVE_IRQ_TIME_ACCOUNTING Max Filippov
2013-10-16 22:42 ` [PATCH 07/17] xtensa: mark ccount as continuous clocksource Max Filippov
2013-10-16 22:42 ` [PATCH 08/17] xtensa: update clockevent setup for SMP Max Filippov
2013-10-16 22:42 ` [PATCH 09/17] xtensa: call check_s32c1i after trap_init Max Filippov
2013-10-16 22:42 ` [PATCH 10/17] xtensa: move init_mmu declaration to mmu_context.h Max Filippov
2013-10-16 22:42 ` [PATCH 11/17] xtensa: move built-in PIC to drivers/irqchip Max Filippov
2013-10-16 22:42 ` [PATCH 12/17] xtensa: clean up do_interrupt/do_IRQ Max Filippov
2013-10-16 22:42 ` Max Filippov [this message]
2013-10-16 22:42 ` [PATCH 14/17] xtensa: add MX irqchip Max Filippov
2013-10-16 22:42 ` [PATCH 15/17] xtensa: add SMP support Max Filippov
2013-10-16 22:42 ` [PATCH 16/17] xtensa: add Three Core HiFi-2 MX Variant Max Filippov
2013-10-16 22:42 ` [PATCH 17/17] xtensa: implement CPU hotplug Max Filippov
2013-11-19 4:05 ` [PATCH 00/17] xtensa SMP queue Chris Zankel
2013-11-19 6:36 ` Max Filippov
2013-11-19 6:45 ` czankel
2013-12-01 5:38 ` [PATCHv2 14/17] xtensa: add MX irqchip Max Filippov
2013-12-01 7:20 ` [Linux-Xtensa] " Baruch Siach
2013-12-01 8:07 ` Max Filippov
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