From: Huang, Ying <ying.huang@intel.com>
Date: Mon, 2 Jun 2008 06:26:18 +0000 (+0800)
Subject: x86: reserve highmem pages via reserve_early
X-Git-Tag: upstream/snapshot3+hdmi~24385^2~249^2~43
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d0ec2c6f2c2f0478b34ae78b3e65f60a561ac807;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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>
---

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index ac5e9eb..a706e90 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 ec30d10..0e7bb5e 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 44ed9c0..8aa3232 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);