linux-kernel - [tip:x86/mrst] x86, mrst: add nop functions to x86

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Date:	Mon, 17 May 2010 06:34:06 GMT
From:	tip-bot for Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, hpa@...ux.intel.com,
	jacob.jun.pan@...ux.intel.com
Subject: [tip:x86/mrst] x86, mrst: add nop functions to x86_init mpparse functions

Commit-ID:  fea24e28c663e62663097f0ed3b8ff1f9a87f15e
Gitweb:     http://git.kernel.org/tip/fea24e28c663e62663097f0ed3b8ff1f9a87f15e
Author:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
AuthorDate: Fri, 14 May 2010 14:41:20 -0700
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Sun, 16 May 2010 22:47:41 -0700

x86, mrst: add nop functions to x86_init mpparse functions

Moorestown does not have BIOS provided MP tables, we can save some time
by avoiding scaning of these tables. e.g.
[    0.000000] Scan SMP from c0000000 for 1024 bytes.
[    0.000000] Scan SMP from c009fc00 for 1024 bytes.
[    0.000000] Scan SMP from c00f0000 for 65536 bytes.
[    0.000000] Scan SMP from c00bfff0 for 1024 bytes.

Searching EBDA with the base at 0x40E will also result in random pointer
deferencing within 1MB. This can be a problem in Lincroft if the pointer
hits VGA area and VGA mode is not enabled.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
LKML-Reference: <1273873281-17489-8-git-send-email-jacob.jun.pan@...ux.intel.com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/kernel/mrst.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c
index 0aad867..e796448 100644
--- a/arch/x86/kernel/mrst.c
+++ b/arch/x86/kernel/mrst.c
@@ -237,4 +237,9 @@ void __init x86_mrst_early_setup(void)
 	x86_init.pci.fixup_irqs = x86_init_noop;
 
 	legacy_pic = &null_legacy_pic;
+
+	/* Avoid searching for BIOS MP tables */
+	x86_init.mpparse.find_smp_config = x86_init_noop;
+	x86_init.mpparse.get_smp_config = x86_init_uint_noop;
+
 }
--
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