x86: Use __memblock_alloc_base() in early_reserve_e820()

early_reserve_e820() implements its own ad-hoc early allocator using
memblock_x86_find_in_range_size().  Use __memblock_alloc_base()
instead and remove the unnecessary @startt parameter (it's top-down
allocation anyway).

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1310462166-31469-6-git-send-email-tj@kernel.org
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 6 insertions, 24 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 0f9ff58..b99d940 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -737,35 +737,17 @@ core_initcall(e820_mark_nvs_memory);
 /*
  * pre allocated 4k and reserved it in memblock and e820_saved
  */
-u64 __init early_reserve_e820(u64 startt, u64 sizet, u64 align)
+u64 __init early_reserve_e820(u64 size, u64 align)
 {
-	u64 size = 0;
 	u64 addr;
-	u64 start;
 
-	for (start = startt; ; start += size) {
-		start = memblock_x86_find_in_range_size(start, &size, align);
-		if (!start)
-			return 0;
-		if (size >= sizet)
-			break;
+	addr = __memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
+	if (addr) {
+		e820_update_range_saved(addr, size, E820_RAM, E820_RESERVED);
+		printk(KERN_INFO "update e820_saved for early_reserve_e820\n");
+		update_e820_saved();
 	}
 
-#ifdef CONFIG_X86_32
-	if (start >= MAXMEM)
-		return 0;
-	if (start + size > MAXMEM)
-		size = MAXMEM - start;
-#endif
-
-	addr = round_down(start + size - sizet, align);
-	if (addr < start)
-		return 0;
-	memblock_x86_reserve_range(addr, addr + sizet, "new next");
-	e820_update_range_saved(addr, sizet, E820_RAM, E820_RESERVED);
-	printk(KERN_INFO "update e820_saved for early_reserve_e820\n");
-	update_e820_saved();
-
 	return addr;
 }