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authorGavin Shan <shangw@linux.vnet.ibm.com>2012-05-29 15:06:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-29 16:22:24 -0700
commit5c2b8a162b5f8616f709bf20d5ec88f709485522 (patch)
treea07e74eb0f8da552fc9ff0acd1b38817c952ba4c
parente48982734ea0500d1eba4f9d96195acc5406cad6 (diff)
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op-kernel-dev-5c2b8a162b5f8616f709bf20d5ec88f709485522.tar.gz
mm/bootmem.c: cleanup on addition to bootmem data list
The objects of "struct bootmem_data_t" are linked together to form double-linked list sequentially based on its minimal page frame number. The current implementation implicitly supports the following cases, which means the inserting point for current bootmem data depends on how "list_for_each" works. That makes the code a little hard to read. Besides, "list_for_each" and "list_entry" can be replaced with "list_for_each_entry". - The linked list is empty. - There has no entry in the linked list, whose minimal page frame number is bigger than current one. Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/bootmem.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index d1c7a79..ec4fcb7 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -77,16 +77,16 @@ unsigned long __init bootmem_bootmap_pages(unsigned long pages)
*/
static void __init link_bootmem(bootmem_data_t *bdata)
{
- struct list_head *iter;
+ bootmem_data_t *ent;
- list_for_each(iter, &bdata_list) {
- bootmem_data_t *ent;
-
- ent = list_entry(iter, bootmem_data_t, list);
- if (bdata->node_min_pfn < ent->node_min_pfn)
- break;
+ list_for_each_entry(ent, &bdata_list, list) {
+ if (bdata->node_min_pfn < ent->node_min_pfn) {
+ list_add_tail(&bdata->list, &ent->list);
+ return;
+ }
}
- list_add_tail(&bdata->list, iter);
+
+ list_add_tail(&bdata->list, &bdata_list);
}
/*
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