From 6b312c0e6e2f44b020e12953d1dd37eed60e3609 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Wed, 23 Jul 2008 21:26:58 -0700 Subject: [PATCH] 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 Cc: Ingo Molnar Cc: Yinghai Lu Cc: Christoph Lameter Cc: Mel Gorman Cc: Andy Whitcroft Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/bootmem.c | 21 ++++++++++----------- 1 file 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, -- 2.7.4