From b7ad2a012ab29b9c7ebf9679b0b69a41165abc48 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 11 Nov 2009 14:05:25 +0000 Subject: [PATCH] clockevents: Use u32 for mult and shift factors The mult and shift factors of clock events differ in their data type from those of clock sources for no reason. u32 is sufficient for both. shift is always <= 32 and mult is limited to 2^32-1 to avoid 64bit multiplication overflows in the conversion. Preparatory patch for a generic mult/shift factor calculation function. Signed-off-by: Thomas Gleixner Tested-by: Mikael Pettersson Acked-by: Ralf Baechle Acked-by: Linus Walleij Cc: John Stultz LKML-Reference: <20091111134229.725664788@linutronix.de> --- include/linux/clockchips.h | 4 ++-- kernel/time/timer_list.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/clockchips.h b/include/linux/clockchips.h index b7905462043c..4d438b0bc10a 100644 --- a/include/linux/clockchips.h +++ b/include/linux/clockchips.h @@ -79,8 +79,8 @@ struct clock_event_device { unsigned int features; unsigned long max_delta_ns; unsigned long min_delta_ns; - unsigned long mult; - int shift; + u32 mult; + u32 shift; int rating; int irq; const struct cpumask *cpumask; diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c index 54c0ddaa06c9..a6e445c673b0 100644 --- a/kernel/time/timer_list.c +++ b/kernel/time/timer_list.c @@ -209,8 +209,8 @@ print_tickdevice(struct seq_file *m, struct tick_device *td, int cpu) SEQ_printf(m, "%s\n", dev->name); SEQ_printf(m, " max_delta_ns: %lu\n", dev->max_delta_ns); SEQ_printf(m, " min_delta_ns: %lu\n", dev->min_delta_ns); - SEQ_printf(m, " mult: %lu\n", dev->mult); - SEQ_printf(m, " shift: %d\n", dev->shift); + SEQ_printf(m, " mult: %u\n", dev->mult); + SEQ_printf(m, " shift: %u\n", dev->shift); SEQ_printf(m, " mode: %d\n", dev->mode); SEQ_printf(m, " next_event: %Ld nsecs\n", (unsigned long long) ktime_to_ns(dev->next_event)); -- 2.34.1