From f302a5bbe5eb95f3d4227d5bd0e9b92b1b125f4f Mon Sep 17 00:00:00 2001
From: Yinghai Lu <yhlu.kernel@gmail.com>
Date: Thu, 10 Jul 2008 20:36:37 -0700
Subject: [PATCH] x86: reserve SLIT

save the SLIT, in case we are using fixmap to read it, and that fixmap
could be cleared by others.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/mm/srat_64.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index 0fd67b81a8b6..1b4763e26ea9 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -100,7 +100,19 @@ static __init inline int srat_disabled(void)
 /* 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 */
-- 
2.20.1