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| author | Huang, Ying <ying.huang@intel.com> | 2008-06-02 14:26:18 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-06-05 15:10:02 +0200 |
| commit | d0ec2c6f2c2f0478b34ae78b3e65f60a561ac807 (patch) | |
| tree | 4d4f6d1e11aa45bc4084e733f52d402e9582d1c7 | |
| parent | d3fbe5ea9518b46a68e6b278974e92e2c3acef4a (diff) | |
| download | blackbird-op-linux-d0ec2c6f2c2f0478b34ae78b3e65f60a561ac807.tar.gz blackbird-op-linux-d0ec2c6f2c2f0478b34ae78b3e65f60a561ac807.zip | |
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>
| -rw-r--r-- | arch/x86/kernel/e820.c | 11 | ||||
| -rw-r--r-- | arch/x86/mm/init_32.c | 3 | ||||
| -rw-r--r-- | include/asm-x86/e820.h | 1 |
3 files changed, 14 insertions, 1 deletions
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); |
