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[PATCH] ppc32: set smp_tb_synchronized on UP with SMP kernel

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ppc32 kernel, when built with CONFIG_SMP and booted on a single CPU
machine, will not properly set smp_tb_synchronized, thus causing
gettimeofday() to not use the HW timebase and to be limited to jiffy
resolution.  This, among others, causes unacceptable pauses when launching
X.org.

Signed-Off-By: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Johannes Berg 2005-12-10 18:41:50 -08:00 committed by Paul Mackerras
parent b39f9485e6
commit ef96943400
1 changed files with 4 additions and 0 deletions
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4
arch/ppc/kernel/smp.c
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@ -301,6 +301,10 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
/* Probe platform for CPUs: always linear. */
num_cpus = smp_ops->probe();
if (num_cpus < 2)
smp_tb_synchronized = 1;
for (i = 0; i < num_cpus; ++i)
cpu_set(i, cpu_possible_map);