From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Fri, 17 Jun 2016 14:43:31 +0100 Subject: [RFC PATCH] clocksource: arm_arch_timer: disable the evtstrm via the cmdline Message-ID: <1466171011-30468-1-git-send-email-will.deacon@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Disabling the eventstream can be useful for debugging and development purposes and is currently controlled via a Kconfig option (CONFIG_ARM_ARCH_TIMER_EVTSTREAM). Whilst this does the trick, it's often desirable to toggle the feature on the command line, so this patch adds a "noevtstrm" command line option to do just that. Signed-off-by: Will Deacon --- Sending as an RFC because we might want to remove the Kconfig option altogether if we have this. drivers/clocksource/arm_arch_timer.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 4814446a0024..f579c0da7423 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -79,6 +79,15 @@ static enum ppi_nr arch_timer_uses_ppi = VIRT_PPI; static bool arch_timer_c3stop; static bool arch_timer_mem_use_virtual; +static bool evtstrm_disable; + +static int __init early_evtstrm_disable(char *buf) +{ + evtstrm_disable = true; + return 0; +} +early_param("noevtstrm", early_evtstrm_disable); + /* * Architected system timer support. */ @@ -372,7 +381,7 @@ static int arch_timer_setup(struct clock_event_device *clk) enable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], 0); arch_counter_set_user_access(); - if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM)) + if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_EVTSTREAM) && !evtstrm_disable) arch_timer_configure_evtstream(); return 0; -- 2.1.4