From: Greg KH <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@kernel.org
Cc: stable-review@kernel.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk,
Jack Steiner <steiner@sgi.com>, Ingo Molnar <mingo@elte.hu>
Subject: [16/19] x86, UV: Remove UV delay in starting slave cpus
Date: Fri, 26 Aug 2011 14:58:37 -0700 [thread overview]
Message-ID: <20110826220121.241815694@clark.kroah.org> (raw)
In-Reply-To: <20110826220137.GA14059@kroah.com>
2.6.32-longterm review patch. If anyone has any objections, please let us know.
------------------
From: Jack Steiner <steiner@sgi.com>
commit 05e33fc20ea5e493a2a1e7f1d04f43cdf89f83ed upstream.
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@sgi.com>
Link: http://lkml.kernel.org/r/20110805140900.GA6774@sgi.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
arch/x86/kernel/apic/x2apic_uv_x.c | 1 -
1 file changed, 1 deletion(-)
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -117,7 +117,6 @@ 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) |
next prev parent reply other threads:[~2011-08-27 14:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-26 22:01 [00/19] 2.6.32.46-longterm review Greg KH
2011-08-26 21:58 ` [01/19] USB: xhci: fix OS want to own HC Greg KH
2011-08-26 21:58 ` [02/19] USB: assign instead of equal in usbtmc.c Greg KH
2011-08-26 21:58 ` [03/19] USB: usb-storage: unusual_devs entry for ARM V2M motherboard Greg KH
2011-08-26 21:58 ` [04/19] USB: Serial: Added device ID for Qualcomm Modem in Sagemcom's HiLo3G Greg KH
2011-08-26 21:58 ` [05/19] atm: br2864: sent packets truncated in VC routed mode Greg KH
2011-08-26 21:58 ` [06/19] hwmon: (ibmaem) add missing kfree Greg KH
2011-08-26 21:58 ` [07/19] ALSA: snd-usb-caiaq: Correct offset fields of outbound iso_frame_desc Greg KH
2011-08-26 21:58 ` [08/19] mm: fix wrong vmap address calculations with odd NR_CPUS values Greg KH
2011-08-26 21:58 ` [09/19] perf tools: do not look at ./config for configuration Greg KH
2011-08-26 21:58 ` [10/19] fs/partitions/efi.c: corrupted GUID partition tables can cause kernel oops Greg KH
2011-08-26 21:58 ` [11/19] befs: Validate length of long symbolic links Greg KH
2011-08-26 21:58 ` [12/19] ALSA: snd_usb_caiaq: track submitted output urbs Greg KH
2011-08-26 21:58 ` [13/19] ALSA: ac97: Add HP Compaq dc5100 SFF(PT003AW) to Headphone Jack Sense whitelist Greg KH
2011-08-26 21:58 ` [14/19] futex: Fix regression with read only mappings Greg KH
2011-08-26 21:58 ` [15/19] x86-32, vdso: On system call restart after SYSENTER, use int $0x80 Greg KH
2011-08-26 21:58 ` Greg KH [this message]
2011-08-26 21:58 ` [17/19] drm/ttm: fix ttm_bo_add_ttm(user) failure path Greg KH
2011-08-26 21:58 ` [18/19] fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message Greg KH
2011-08-26 21:58 ` [19/19] igb: Fix lack of flush after register write and before delay Greg KH
2011-08-27 15:27 ` [00/19] 2.6.32.46-longterm review Christoph Biedl
2011-08-27 16:05 ` Greg KH
2011-08-27 16:25 ` Christoph Biedl
2011-08-28 12:34 ` Stratos Psomadakis
2011-08-28 15:07 ` [stable] " Greg KH
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