Commit 636cc40c authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds
Browse files

bootmem: revisit bootmem descriptor list handling 



link_bootmem handles an insertion of a new descriptor into the sorted list
in more or less three explicit branches; empty list, insert in between and
append.  These cases can be expressed implicite.

Also mark the sorted list as initdata as it can be thrown away after boot
as well.

Signed-off-by: default avatarJohannes Weiner <hannes@saeurebad.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent df049a5f

mm/bootmem.c

+10 −13
Original line number Diff line number Diff line
@@ -23,7 +23,6 @@ unsigned long max_low_pfn; 
unsigned long min_low_pfn;

unsigned long max_pfn;



static LIST_HEAD(bdata_list);

#ifdef CONFIG_CRASH_DUMP

/*

 * If we have booted due to a crash, max_pfn will be a very low value. We need
@@ -34,6 +33,8 @@ unsigned long saved_max_pfn; 


bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;



static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);



static int bootmem_debug;



static int __init bootmem_debug_setup(char *buf)
@@ -73,20 +74,16 @@ unsigned long __init bootmem_bootmap_pages(unsigned long pages) 
 */

static void __init link_bootmem(bootmem_data_t *bdata)

{

	struct list_head *iter;



	list_for_each(iter, &bdata_list) {

		bootmem_data_t *ent;



	if (list_empty(&bdata_list)) {

		list_add(&bdata->list, &bdata_list);

		return;

	}

	/* insert in order */

	list_for_each_entry(ent, &bdata_list, list) {

		if (bdata->node_boot_start < ent->node_boot_start) {

			list_add_tail(&bdata->list, &ent->list);

			return;

		}

		ent = list_entry(iter, bootmem_data_t, list);

		if (bdata->node_boot_start < ent->node_boot_start)

			break;

	}

	list_add_tail(&bdata->list, &bdata_list);

	list_add_tail(&bdata->list, iter);

}



/*

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