clocksource/drivers/sh_cmt: Fix clocksource width for 32-bit machines

The driver seems to abuse *unsigned long* not only for the (32-bit)
register values but also for the 'sh_cmt_channel::total_cycles' which
needs to always be 64-bit -- as a result, the clocksource's mask is
needlessly clamped down to 32-bits on the 32-bit machines...

Fixes: 19bdc9d061bc ("clocksource: sh_cmt clocksource support")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index efaf00d..0c74489 100644 (file)
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -100,7 +100,7 @@ struct sh_cmt_channel {
        raw_spinlock_t lock;
        struct clock_event_device ced;
        struct clocksource cs;
-       unsigned long total_cycles;
+       u64 total_cycles;
        bool cs_enabled;
 };
 
@@ -605,8 +605,8 @@ static u64 sh_cmt_clocksource_read(struct clocksource *cs)
 {
        struct sh_cmt_channel *ch = cs_to_sh_cmt(cs);
        unsigned long flags;
-       unsigned long value;
        u32 has_wrapped;
+       u64 value;
        u32 raw;
 
        raw_spin_lock_irqsave(&ch->lock, flags);
@@ -680,7 +680,7 @@ static int sh_cmt_register_clocksource(struct sh_cmt_channel *ch,
        cs->disable = sh_cmt_clocksource_disable;
        cs->suspend = sh_cmt_clocksource_suspend;
        cs->resume = sh_cmt_clocksource_resume;
-       cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
+       cs->mask = CLOCKSOURCE_MASK(sizeof(u64) * 8);
        cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
 
        dev_info(&ch->cmt->pdev->dev, "ch%u: used as clock source\n",