Messages in this thread | | | Date | Tue, 6 Jan 2004 08:29:16 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [PATCH] fix get_jiffies_64 to work on voyager |
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On Tue, 6 Jan 2004, Andrew Morton wrote: > > 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);
Augh. If you cast it to "unsigned long long" anyway, why not just use the right value? It's "jiffies_64".
It has other problems, of course, but at least that makes them slightly less.
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