diff options
author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-02-15 13:36:30 -0500 |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-02-15 13:36:30 -0500 |
commit | 52833e897fd8c6f62b3e5e27291fa9bc803f7460 (patch) | |
tree | cfe90047ee6c7402674a29ec7258319142b96ff1 /arch/sh/kernel/time_64.c | |
parent | 8d042218b075de3cdbe066198515b3521553746e (diff) | |
parent | 4ee29f6a52158cea526b16a44ae38643946103ec (diff) |
Merge branch 'linus_origin' into hotfixes
Diffstat (limited to 'arch/sh/kernel/time_64.c')
-rw-r--r-- | arch/sh/kernel/time_64.c | 31 |
1 files changed, 17 insertions, 14 deletions
diff --git a/arch/sh/kernel/time_64.c b/arch/sh/kernel/time_64.c index f819ba38a6c..898977ee203 100644 --- a/arch/sh/kernel/time_64.c +++ b/arch/sh/kernel/time_64.c @@ -229,15 +229,22 @@ static long last_rtc_update; static inline void do_timer_interrupt(void) { unsigned long long current_ctc; + + if (current->pid) + profile_tick(CPU_PROFILING); + + /* + * Here we are in the timer irq handler. We just have irqs locally + * disabled but we don't know if the timer_bh is running on the other + * CPU. We need to avoid to SMP race with it. NOTE: we don' t need + * the irq version of write_lock because as just said we have irq + * locally disabled. -arca + */ + write_lock(&xtime_lock); asm ("getcon cr62, %0" : "=r" (current_ctc)); ctc_last_interrupt = (unsigned long) current_ctc; do_timer(1); -#ifndef CONFIG_SMP - update_process_times(user_mode(get_irq_regs())); -#endif - if (current->pid) - profile_tick(CPU_PROFILING); #ifdef CONFIG_HEARTBEAT if (sh_mv.mv_heartbeat != NULL) @@ -259,6 +266,11 @@ static inline void do_timer_interrupt(void) /* do it again in 60 s */ last_rtc_update = xtime.tv_sec - 600; } + write_unlock(&xtime_lock); + +#ifndef CONFIG_SMP + update_process_times(user_mode(get_irq_regs())); +#endif } /* @@ -275,16 +287,7 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id) timer_status &= ~0x100; ctrl_outw(timer_status, TMU0_TCR); - /* - * Here we are in the timer irq handler. We just have irqs locally - * disabled but we don't know if the timer_bh is running on the other - * CPU. We need to avoid to SMP race with it. NOTE: we don' t need - * the irq version of write_lock because as just said we have irq - * locally disabled. -arca - */ - write_lock(&xtime_lock); do_timer_interrupt(); - write_unlock(&xtime_lock); return IRQ_HANDLED; } |