Messages in this thread Patch in this message | | | Date | Tue, 6 Jan 2004 08:19:47 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] fix get_jiffies_64 to work on voyager |
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James Bottomley <James.Bottomley@SteelEye.com> wrote: > > This patch > > > ChangeSet@1.1534.5.2, 2003-12-30 15:40:23-08:00, akpm@osdl.org > [PATCH] ia32 jiffy wrapping fixes > > Causes the voyager boot to hang. The problem is this change: > > --- a/arch/i386/kernel/timers/timer_tsc.c Tue Jan 6 09:57:34 2004 > +++ b/arch/i386/kernel/timers/timer_tsc.c Tue Jan 6 09:57:34 2004 > @@ -141,7 +140,7 @@ > #ifndef CONFIG_NUMA > if (!use_tsc) > #endif > - return (unsigned long long)jiffies * (1000000000 / HZ); > + return (unsigned long long)get_jiffies_64() * > (1000000000 / HZ);
Hm, OK. I hit the same deadlock when running with the "don't require TSCs to be synchronised in sched_clock()" patch from -mm. The fix for that is below. I shall accelerate it.
--- 25/arch/i386/kernel/timers/timer_tsc.c~sched_clock-2.6.0-A1-deadlock-fix 2003-12-30 00:45:09.000000000 -0800 +++ 25-akpm/arch/i386/kernel/timers/timer_tsc.c 2003-12-30 00:45:09.000000000 -0800 @@ -140,7 +140,8 @@ unsigned long long sched_clock(void) #ifndef CONFIG_NUMA if (!use_tsc) #endif - return (unsigned long long)get_jiffies_64() * (1000000000 / HZ); + /* jiffies might overflow but this is not a big deal here */ + return (unsigned long long)jiffies * (1000000000 / HZ); /* Read the Time Stamp Counter */ rdtscll(this_offset); _
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