commit: 05e33fc20ea5e493a2a1e7f1d04f43cdf89f83ed
From: Jack Steiner <stei...@sgi.com>
Date: Fri, 5 Aug 2011 09:09:00 -0500
Subject: [PATCH] x86, UV: Remove UV delay in starting slave cpus

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 <stei...@sgi.com>
Cc: <sta...@kernel.org>
Link: http://lkml.kernel.org/r/20110805140900.ga6...@sgi.com
Signed-off-by: Ingo Molnar <mi...@elte.hu>
---
 arch/x86/kernel/apic/x2apic_uv_x.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c 
b/arch/x86/kernel/apic/x2apic_uv_x.c
index adc66c3..34b1859 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -207,7 +207,6 @@ static int __cpuinit uv_wakeup_secondary(int phys_apicid, 
unsigned long start_ri
            ((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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