[PATCH] x86, UV: Remove UV delay in starting slave cpus

[Jack Steiner]

Delete the 10 msec delay between the INIT and SIPI when starting slave
cpus. I can find no requirement for this delay. BIOS also has similar code
sequences without the delay.

Removing the delay reduces boot time by 40 sec. Every bit helps.

Signed-off-by: Jack Steiner <steiner@xxxxxxx>


---
 arch/x86/kernel/apic/x2apic_uv_x.c |    1 -
 1 file changed, 1 deletion(-)

Index: linux/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c	2011-08-05 08:22:42.511980932 -0500
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c	2011-08-05 08:23:27.488613896 -0500
@@ -207,7 +207,6 @@ static int __cpuinit uv_wakeup_secondary
 	    ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
 	    APIC_DM_INIT;
 	uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
-	mdelay(10);
 
 	val = (1UL << UVH_IPI_INT_SEND_SHFT) |
 	    (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |
--
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