From d0ec2c6f2c2f0478b34ae78b3e65f60a561ac807 Mon Sep 17 00:00:00 2001
From: "Huang, Ying" <ying.huang@intel.com>
Date: Mon, 2 Jun 2008 14:26:18 +0800
Subject: [PATCH] x86: reserve highmem pages via reserve_early
This patch makes early reserved highmem pages become reserved
pages. This can be used for highmem pages allocated by bootloader such
as EFI memory map, linked list of setup_data, etc.
Signed-off-by: Huang Ying <ying.huang@intel.com>
Cc: andi@firstfloor.org
Cc: mingo@redhat.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/e820.c | 11 +++++++++++
arch/x86/mm/init_32.c | 3 ++-
include/asm-x86/e820.h | 1 +
3 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index ac5e9ebf70ea..a706e9057ba5 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -612,6 +612,17 @@ void __init free_early(u64 start, u64 end)
early_res[j - 1].end = 0;
}
+int __init page_is_reserved_early(unsigned long pagenr)
+{
+ u64 start = (u64)pagenr << PAGE_SHIFT;
+ int i;
+ struct early_res *r;
+
+ i = find_overlapped_early(start, start + PAGE_SIZE);
+ r = &early_res[i];
+ return (i < MAX_EARLY_RES && r->end);
+}
+
void __init early_res_to_bootmem(u64 start, u64 end)
{
int i;
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index ec30d10154b6..0e7bb5e81670 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -289,7 +289,8 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
{
- if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn))) {
+ if (page_is_ram(pfn) && !(bad_ppro && page_kills_ppro(pfn)) &&
+ !page_is_reserved_early(pfn)) {
ClearPageReserved(page);
init_page_count(page);
__free_page(page);
diff --git a/include/asm-x86/e820.h b/include/asm-x86/e820.h
index 44ed9c0a4dfd..8aa32323a182 100644
--- a/include/asm-x86/e820.h
+++ b/include/asm-x86/e820.h
@@ -86,6 +86,7 @@ extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
extern void reserve_early(u64 start, u64 end, char *name);
extern void free_early(u64 start, u64 end);
extern void early_res_to_bootmem(u64 start, u64 end);
+extern int page_is_reserved_early(unsigned long pagenr);
extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
extern unsigned long e820_end_of_ram(void);
--
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