From mboxrd@z Thu Jan 1 00:00:00 1970 From: daniel.lezcano@linaro.org (Daniel Lezcano) Date: Thu, 16 Mar 2017 17:44:05 +0100 Subject: [PATCH] Revert "clocksource/drivers/tcb_clksrc: Use 32 bit tcb as sched_clock" In-Reply-To: <20170316164208.GB6579@mai> References: <20170316164208.GB6579@mai> Message-ID: <1489682645-11369-1-git-send-email-daniel.lezcano@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Romain Izard This reverts commit 7b9f1d16e6d1 ("clocksource/drivers/tcb_clksrc: Use 32 bit tcb as sched_clock"). In the current state, the kernel warns against a late registration of the new sched_clock, the printk clock resets after only a few minutes, and it seems that scheduling can be affected as well. Signed-off-by: Romain Izard Signed-off-by: Daniel Lezcano --- drivers/clocksource/tcb_clksrc.c | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-) diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c index 745844e..d4ca996 100644 --- a/drivers/clocksource/tcb_clksrc.c +++ b/drivers/clocksource/tcb_clksrc.c @@ -10,7 +10,6 @@ #include #include #include -#include /* @@ -57,14 +56,9 @@ static u64 tc_get_cycles(struct clocksource *cs) return (upper << 16) | lower; } -static u32 tc_get_cv32(void) -{ - return __raw_readl(tcaddr + ATMEL_TC_REG(0, CV)); -} - static u64 tc_get_cycles32(struct clocksource *cs) { - return tc_get_cv32(); + return __raw_readl(tcaddr + ATMEL_TC_REG(0, CV)); } static struct clocksource clksrc = { @@ -75,11 +69,6 @@ static struct clocksource clksrc = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; -static u64 notrace tc_read_sched_clock(void) -{ - return tc_get_cv32(); -} - #ifdef CONFIG_GENERIC_CLOCKEVENTS struct tc_clkevt_device { @@ -350,9 +339,6 @@ static int __init tcb_clksrc_init(void) clksrc.read = tc_get_cycles32; /* setup ony channel 0 */ tcb_setup_single_chan(tc, best_divisor_idx); - - /* register sched_clock on chips with single 32 bit counter */ - sched_clock_register(tc_read_sched_clock, 32, divided_rate); } else { /* tclib will give us three clocks no matter what the * underlying platform supports. -- 2.7.4