lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 11 Nov 2010 17:36:22 +0900 From: MyungJoo Ham <myungjoo.ham@...sung.com> To: linux-kernel@...r.kernel.org Cc: kyungmin.park@...sung.com, myungjoo.ham@...il.com, Thomas Gleixner <tglx@...utronix.de>, John Stultz <johnstul@...ibm.com>, Magnus Damm <damm@...nsource.se>, Andrew Morton <akpm@...ux-foundation.org>, Jon Hunter <jon-hunter@...com> Subject: [RFC-PATCH] clocksource: update lpj if clocksource has been changed. With a clocksource change, loops_per_jiffy may have been changed; thus, the loops_per_jiffy in each cpu should be updated. Especially after some of the cpus were turned off and on, their loops_per_jiffy values are updated while the cpus kept on are not. Therefore, in order to make them "normalized equally", we need to let the loops_per_jiffy values of different cpus be based on the same clocksource. Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com> Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com> --- kernel/time/clocksource.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index c18d7ef..a9d7935 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -30,6 +30,9 @@ #include <linux/sched.h> /* for spin_unlock_irq() using preempt_count() m68k */ #include <linux/tick.h> #include <linux/kthread.h> +#include <linux/delay.h> void timecounter_init(struct timecounter *tc, const struct cyclecounter *cc, @@ -592,6 +593,9 @@ static inline void clocksource_select(void) { } */ static int __init clocksource_done_booting(void) { +#ifdef CONFIG_SMP + int cpu; +#endif mutex_lock(&clocksource_mutex); curr_clocksource = clocksource_default_clock(); mutex_unlock(&clocksource_mutex); @@ -606,6 +610,13 @@ static int __init clocksource_done_booting(void) mutex_lock(&clocksource_mutex); clocksource_select(); mutex_unlock(&clocksource_mutex); + + calibrate_delay(); +#ifdef CONFIG_SMP + /* loops_per_jiffy may have been changed. */ + for_each_online_cpu(cpu) + smp_store_cpu_info(cpu); +#endif return 0; } fs_initcall(clocksource_done_booting); -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists