linux-kernel - [PATCH] x86: save slit

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Message-Id: <200807102036.37697.yhlu.kernel@gmail.com>
Date:	Thu, 10 Jul 2008 20:36:37 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: save slit


in case we are using fixmap to read it. and that fixmap could be clearred by others.

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

---
 arch/x86/mm/srat_64.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

Index: linux-2.6/arch/x86/mm/srat_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/srat_64.c
+++ linux-2.6/arch/x86/mm/srat_64.c
@@ -100,7 +100,19 @@ static __init inline int srat_disabled(v
 /* Callback for SLIT parsing */
 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 {
-	acpi_slit = slit;
+	unsigned length;
+	unsigned long phys;
+
+	length = slit->header.length;
+	phys = find_e820_area(0, max_pfn_mapped<<PAGE_SHIFT, length,
+		 PAGE_SIZE);
+
+	if (phys == -1L)
+		panic(" Can not save slit!\n");
+
+	acpi_slit = __va(phys);
+	memcpy(acpi_slit, slit, length);
+	reserve_early(phys, phys + length, "ACPI SLIT");
 }
 
 /* Callback for Proximity Domain -> LAPIC mapping */
--
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