Messages in this thread | | | Subject | Re: [PATCH][2.5] smp_call_function_mask | From | Alan Cox <> | Date | 21 Jan 2003 23:14:49 +0000 |
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On Tue, 2003-01-21 at 07:13, Manfred Spraul wrote: > Alan wrote: > > >On Fri, 2003-01-17 at 05:18, Zwane Mwaikambo wrote: > >> + /* Wait for response */ > >> + while (atomic_read(&data.started) != num_cpus) > >> + barrier(); > > > >Only old old intel x86 that does -bad- things as it > >generates a lot of bus locked cycles. Better to do > > > > while(atomic_read(&data.started) != num_cpus)
> from 2.5.52, <asm-i386/atomic.h> > #define atomic_read(v) ((v)->counter) > AFAIK atomic_read never contained locked bus cycles.
For x86 at least it never did, you are right. Must be time for a brain transplant
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