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authorJohannes Weiner <hannes@saeurebad.de>2008-07-23 21:26:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:14 -0700
commit6b312c0e6e2f44b020e12953d1dd37eed60e3609 (patch)
tree4f2a1177b0013b411bf4799fb3c776128f5fa6f9
parentb61bfa3c462671c48a51fb5c31af337c5a996a04 (diff)
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mm: fix free_all_bootmem_core alignment check
The check for node_boot_start is bogus because we start freeing at the corresponding pfn. So check if the pfn is properly aligned instead in a more readable way and adjust the documentation. Also remove an unneeded accounting variable. Signed-off-by: Johannes Weiner <hannes@saeurebad.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/bootmem.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 35b3cb6..319a79b 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -377,7 +377,7 @@ static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
struct page *page;
unsigned long pfn;
bootmem_data_t *bdata = pgdat->bdata;
- unsigned long i, count, total = 0;
+ unsigned long i, count;
unsigned long idx;
unsigned long *map;
int gofast = 0;
@@ -389,10 +389,13 @@ static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
pfn = PFN_DOWN(bdata->node_boot_start);
idx = bdata->node_low_pfn - pfn;
map = bdata->node_bootmem_map;
- /* Check physaddr is O(LOG2(BITS_PER_LONG)) page aligned */
- if (bdata->node_boot_start == 0 ||
- ffs(bdata->node_boot_start) - PAGE_SHIFT > ffs(BITS_PER_LONG))
+ /*
+ * 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;
+
for (i = 0; i < idx; ) {
unsigned long v = ~map[i / BITS_PER_LONG];
@@ -420,23 +423,19 @@ static unsigned long __init free_all_bootmem_core(pg_data_t *pgdat)
}
pfn += BITS_PER_LONG;
}
- total += count;
/*
* Now free the allocator bitmap itself, it's not
* needed anymore:
*/
page = virt_to_page(bdata->node_bootmem_map);
- count = 0;
idx = (get_mapsize(bdata) + PAGE_SIZE-1) >> PAGE_SHIFT;
- for (i = 0; i < idx; i++, page++) {
+ for (i = 0; i < idx; i++, page++)
__free_pages_bootmem(page, 0);
- count++;
- }
- total += count;
+ count += i;
bdata->node_bootmem_map = NULL;
- return total;
+ return count;
}
unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,