From 4e2f07750d9a94e8f23e86408df5ab95be88bf11 Mon Sep 17 00:00:00 2001
From: Gavin Shan <shangw@linux.vnet.ibm.com>
Date: Tue, 29 May 2012 15:06:50 -0700
Subject: [PATCH] mm/memblock: cleanup on duplicate VA/PA conversion
The overall memblock has been organized into the memory regions and
reserved regions. Initially, the memory regions and reserved regions are
stored in the predetermined arrays of "struct memblock _region". It's
possible for the arrays to be enlarged when we have newly added regions
for them, but no enough space there. Under the situation, We will created
double-sized array to meet the requirement. However, the original
implementation converted the VA (Virtual Address) of the newly allocated
array of regions to PA (Physical Address), then translate back when we
allocates the new array from slab. That's actually unnecessary.
The patch removes the duplicate VA/PA conversion.
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/memblock.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/memblock.c b/mm/memblock.c
index a44eab3157f8d..eae06ea3aa50d 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -212,14 +212,15 @@ static int __init_memblock memblock_double_array(struct memblock_type *type)
if (use_slab) {
new_array = kmalloc(new_size, GFP_KERNEL);
addr = new_array ? __pa(new_array) : 0;
- } else
+ } else {
addr = memblock_find_in_range(0, MEMBLOCK_ALLOC_ACCESSIBLE, new_size, sizeof(phys_addr_t));
+ new_array = addr ? __va(addr) : 0;
+ }
if (!addr) {
pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
memblock_type_name(type), type->max, type->max * 2);
return -1;
}
- new_array = __va(addr);
memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]",
memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1);
--
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