From: Heiko Carstens Date: Wed, 5 Jan 2011 11:48:18 +0000 (+0100) Subject: [S390] prevent unneccesary loops_per_jiffy recalculation X-Git-Tag: firefly_0821_release~7613^2~3107^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8e1023016cf17152972b98bce6c144834a4916d5;p=firefly-linux-kernel-4.4.55.git [S390] prevent unneccesary loops_per_jiffy recalculation When the seqfile /proc/cpuinfo gets accesses for each possible cpu loops_per_jiffy gets recalculated. However its value is only needed on first access. In addition loops_per_jiffy should be recalculated when the machine reports a capability change. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- diff --git a/arch/s390/kernel/processor.c b/arch/s390/kernel/processor.c index 753623bde8ec..311e9d712888 100644 --- a/arch/s390/kernel/processor.c +++ b/arch/s390/kernel/processor.c @@ -46,8 +46,8 @@ static int show_cpuinfo(struct seq_file *m, void *v) unsigned long n = (unsigned long) v - 1; int i; - s390_adjust_jiffies(); if (!n) { + s390_adjust_jiffies(); seq_printf(m, "vendor_id : IBM/S390\n" "# processors : %i\n" "bogomips per cpu: %lu.%02lu\n", diff --git a/drivers/s390/char/sclp_config.c b/drivers/s390/char/sclp_config.c index b497afe061cc..16e232a99fb7 100644 --- a/drivers/s390/char/sclp_config.c +++ b/drivers/s390/char/sclp_config.c @@ -33,6 +33,7 @@ static void sclp_cpu_capability_notify(struct work_struct *work) int cpu; struct sys_device *sysdev; + s390_adjust_jiffies(); pr_warning("cpu capability changed.\n"); get_online_cpus(); for_each_online_cpu(cpu) {