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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>
This commit is contained in:
Johannes Weiner 2008-07-23 21:28:02 -07:00 committed by Linus Torvalds
parent 2e5237daf0
commit df049a5f41
1 changed files with 9 additions and 18 deletions
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27
mm/bootmem.c
View File

@ -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;
unsigned long bytes = bootmap_bytes(pages);
mapsize = (pages+7)/8;
mapsize = (mapsize + ~PAGE_MASK) & PAGE_MASK;
mapsize >>= PAGE_SHIFT;
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;