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Commit 9b843cda authored by Anton Blanchard's avatar Anton Blanchard Committed by Linus Torvalds
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[PATCH] ppc64: set/clear SMT capable bit at boot 



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: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 515bae9c

arch/ppc64/kernel/prom.c

+12 −0
Original line number Original line Diff line number Diff line
@@ -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);

	char *type = get_flat_dt_prop(node, "device_type", NULL);

	u32 *prop;

	u32 *prop;

	unsigned long size;





	/* We are scanning "cpu" nodes only */

	/* We are scanning "cpu" nodes only */

	if (type == NULL || strcmp(type, "cpu") != 0)

	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;

		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;

	return 0;

}

}