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[PATCH] ppc64: set/clear SMT capable bit at boot

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Allow the SMT bit to be set/reset at boot, like the ALTIVEC bit.  This
means we will enable SMT on unknown cpus that support it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Anton Blanchard 2005-06-21 17:15:55 -07:00 committed by Linus Torvalds
parent 515bae9cdc
commit 9b843cda19
1 changed files with 12 additions and 0 deletions
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12
arch/ppc64/kernel/prom.c
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@ -884,6 +884,7 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
{
char *type = get_flat_dt_prop(node, "device_type", NULL);
u32 *prop;
unsigned long size;
/* We are scanning "cpu" nodes only */
if (type == NULL || strcmp(type, "cpu") != 0)
@ -929,6 +930,17 @@ static int __init early_init_dt_scan_cpus(unsigned long node,
cur_cpu_spec->cpu_user_features |= PPC_FEATURE_HAS_ALTIVEC;
}
/*
* Check for an SMT capable CPU and set the CPU feature. We do
* this by looking at the size of the ibm,ppc-interrupt-server#s
* property
*/
prop = (u32 *)get_flat_dt_prop(node, "ibm,ppc-interrupt-server#s",
&size);
cur_cpu_spec->cpu_features &= ~CPU_FTR_SMT;
if (prop && ((size / sizeof(u32)) > 1))
cur_cpu_spec->cpu_features |= CPU_FTR_SMT;
return 0;
}