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bootmem: clean up free_all_bootmem_core

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Rewrite the code in a more concise way using less variables.

[akpm@linux-foundation.org: fix printk warnings]
Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
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 21:28:03 -07:00 committed by Linus Torvalds
parent 636cc40cb7
commit 41546c1741
1 changed files with 38 additions and 45 deletions
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87
mm/bootmem.c
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@ -144,66 +144,59 @@ unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
{
int aligned;
struct page *page;
unsigned long pfn;
unsigned long i, count;
unsigned long idx, pages;
unsigned long *map;
int gofast = 0;
unsigned long start, end, pages, count = 0;
BUG_ON(!bdata->node_bootmem_map);
if (!bdata->node_bootmem_map)
return 0;
start = PFN_DOWN(bdata->node_boot_start);
end = bdata->node_low_pfn;
/*
* If the start is aligned to the machines wordsize, we might
* be able to free pages in bulks of that order.
*/
aligned = !(start & (BITS_PER_LONG - 1));
bdebug("nid=%td start=%lx end=%lx aligned=%d\n",
bdata - bootmem_node_data, start, end, aligned);
while (start < end) {
unsigned long *map, idx, vec;
count = 0;
/* first extant page of the node */
pfn = PFN_DOWN(bdata->node_boot_start);
idx = bdata->node_low_pfn - pfn;
map = bdata->node_bootmem_map;
/*
* Check if we are aligned to BITS_PER_LONG pages. If so, we might
* be able to free page orders of that size at once.
*/
if (!(pfn & (BITS_PER_LONG-1)))
gofast = 1;
idx = start - PFN_DOWN(bdata->node_boot_start);
vec = ~map[idx / BITS_PER_LONG];
for (i = 0; i < idx; ) {
unsigned long v = ~map[i / BITS_PER_LONG];
if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) {
int order = ilog2(BITS_PER_LONG);
if (gofast && v == ~0UL) {
int order;
page = pfn_to_page(pfn);
__free_pages_bootmem(pfn_to_page(start), order);
count += BITS_PER_LONG;
order = ffs(BITS_PER_LONG) - 1;
__free_pages_bootmem(page, order);
i += BITS_PER_LONG;
page += BITS_PER_LONG;
} else if (v) {
unsigned long m;
page = pfn_to_page(pfn);
for (m = 1; m && i < idx; m<<=1, page++, i++) {
if (v & m) {
count++;
__free_pages_bootmem(page, 0);
}
}
} else {
i += BITS_PER_LONG;
unsigned long off = 0;
while (vec && off < BITS_PER_LONG) {
if (vec & 1) {
page = pfn_to_page(start + off);
__free_pages_bootmem(page, 0);
count++;
}
pfn += BITS_PER_LONG;
vec >>= 1;
off++;
}
}
start += BITS_PER_LONG;
}
/*
* Now free the allocator bitmap itself, it's not
* needed anymore:
*/
page = virt_to_page(bdata->node_bootmem_map);
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;
bdata->node_bootmem_map = NULL;
pages = bootmem_bootmap_pages(pages);
count += pages;
while (pages--)
__free_pages_bootmem(page++, 0);
bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);