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authorJohannes Weiner <hannes@saeurebad.de>2008-07-23 21:28:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:20 -0700
commitdf049a5f41a3b2eee2131221959e3b558ba7c705 (patch)
treedcba7fb3e442838e93e2fb0deb66acc79372b123 /mm
parent2e5237daf0cc3c8d87762f53f704dc54fa91dcf6 (diff)
downloadop-kernel-dev-df049a5f41a3b2eee2131221959e3b558ba7c705.zip
op-kernel-dev-df049a5f41a3b2eee2131221959e3b558ba7c705.tar.gz
bootmem: revisit bitmap size calculations
Reincarnate get_mapsize as bootmap_bytes and implement bootmem_bootmap_pages on top of it. Adjust users of these helpers and make free_all_bootmem_core use bootmem_bootmap_pages instead of open-coding it. Signed-off-by: Johannes Weiner <hannes@saeurebad.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/bootmem.c27
1 files changed, 9 insertions, 18 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 4e085ee..484849b 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -50,17 +50,11 @@ early_param("bootmem_debug", bootmem_debug_setup);
__FUNCTION__, ## args); \
})
-/*
- * Given an initialised bdata, it returns the size of the boot bitmap
- */
-static unsigned long __init get_mapsize(bootmem_data_t *bdata)
+static unsigned long __init bootmap_bytes(unsigned long pages)
{
- unsigned long mapsize;
- unsigned long start = PFN_DOWN(bdata->node_boot_start);
- unsigned long end = bdata->node_low_pfn;
+ unsigned long bytes = (pages + 7) / 8;
- mapsize = ((end - start) + 7) / 8;
- return ALIGN(mapsize, sizeof(long));
+ return ALIGN(bytes, sizeof(long));
}
/**
@@ -69,13 +63,9 @@ static unsigned long __init get_mapsize(bootmem_data_t *bdata)
*/
unsigned long __init bootmem_bootmap_pages(unsigned long pages)
{
- unsigned long mapsize;
-
- mapsize = (pages+7)/8;
- mapsize = (mapsize + ~PAGE_MASK) & PAGE_MASK;
- mapsize >>= PAGE_SHIFT;
+ unsigned long bytes = bootmap_bytes(pages);
- return mapsize;
+ return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
}
/*
@@ -117,7 +107,7 @@ static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
* Initially all pages are reserved - setup_arch() has to
* register free RAM areas explicitly.
*/
- mapsize = get_mapsize(bdata);
+ mapsize = bootmap_bytes(end - start);
memset(bdata->node_bootmem_map, 0xff, mapsize);
bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
@@ -160,7 +150,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
struct page *page;
unsigned long pfn;
unsigned long i, count;
- unsigned long idx;
+ unsigned long idx, pages;
unsigned long *map;
int gofast = 0;
@@ -211,7 +201,8 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
* needed anymore:
*/
page = virt_to_page(bdata->node_bootmem_map);
- idx = (get_mapsize(bdata) + PAGE_SIZE-1) >> PAGE_SHIFT;
+ pages = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
+ idx = bootmem_bootmap_pages(pages);
for (i = 0; i < idx; i++, page++)
__free_pages_bootmem(page, 0);
count += i;
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