From: Jan Beulich <jbeulich@novell.com>
Date: Tue, 26 Sep 2006 08:52:31 +0000 (+0200)
Subject: [PATCH] initialize end of memory variables as early as possible
X-Git-Tag: v2.6.19-rc1~1077^2~158
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=caff0710ebf6f2c44cbd2b8b31fd6329148bed2e;p=linux-2.6-omap-h63xx.git

[PATCH] initialize end of memory variables as early as possible

While an earlier patch already did a small step into that direction,
this patch moves initialization of all memory end variables to as
early as possible, so that dependent code doesn't need to check
whether these variables have already been set.

Also, remove a misleading (perhaps just outdated) comment, and make
static a variable only used in a single file.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
---

diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index d6d7f731f6f..1362aad4f3a 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -40,7 +40,7 @@ unsigned long end_pfn_map;
 /* 
  * Last pfn which the user wants to use.
  */
-unsigned long end_user_pfn = MAXMEM>>PAGE_SHIFT;  
+static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;
 
 extern struct resource code_resource, data_resource;
 
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index aab4bd66aa0..ddc3b2d9a16 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -554,7 +554,7 @@ void __init setup_arch(char **cmdline_p)
 	 * we are rounding upwards:
 	 */
 	end_pfn = e820_end_of_ram();
-	num_physpages = end_pfn;		/* for pfn_valid */
+	num_physpages = end_pfn;
 
 	check_efer();
 
@@ -574,6 +574,11 @@ void __init setup_arch(char **cmdline_p)
 	acpi_boot_table_init();
 #endif
 
+	/* How many end-of-memory variables you have, grandma! */
+	max_low_pfn = end_pfn;
+	max_pfn = end_pfn;
+	high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;
+
 #ifdef CONFIG_ACPI_NUMA
 	/*
 	 * Parse SRAT to discover nodes.
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index d14fb2dfbfc..d40134bd639 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -597,12 +597,6 @@ void __init mem_init(void)
 
 	pci_iommu_alloc();
 
-	/* How many end-of-memory variables you have, grandma! */
-	max_low_pfn = end_pfn;
-	max_pfn = end_pfn;
-	num_physpages = end_pfn;
-	high_memory = (void *) __va(end_pfn * PAGE_SIZE);
-
 	/* clear the zero-page */
 	memset(empty_zero_page, 0, PAGE_SIZE);