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 @@
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;