From: Uwe Kleine-König Date: Tue, 10 Jan 2012 23:08:00 +0000 (-0800) Subject: bootmem: micro optimize freeing pages in bulk X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9571a982903bf9dcbca2479fd3e7dafd2211ecf9;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git bootmem: micro optimize freeing pages in bulk The first entry of bdata->node_bootmem_map holds the data for bdata->node_min_pfn up to bdata->node_min_pfn + BITS_PER_LONG - 1. So the test for freeing all pages of a single map entry can be slightly relaxed. Moreover use DIV_ROUND_UP in another place instead of open coding it. Signed-off-by: Uwe Kleine-König Cc: Johannes Weiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/bootmem.c b/mm/bootmem.c index 1a77012ecdb3..3e6f152f117e 100644 --- a/mm/bootmem.c +++ b/mm/bootmem.c @@ -56,7 +56,7 @@ early_param("bootmem_debug", bootmem_debug_setup); static unsigned long __init bootmap_bytes(unsigned long pages) { - unsigned long bytes = (pages + 7) / 8; + unsigned long bytes = DIV_ROUND_UP(pages, 8); return ALIGN(bytes, sizeof(long)); } @@ -197,7 +197,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata) idx = start - bdata->node_min_pfn; vec = ~map[idx / BITS_PER_LONG]; - if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) { + if (aligned && vec == ~0UL && start + BITS_PER_LONG <= end) { int order = ilog2(BITS_PER_LONG); __free_pages_bootmem(pfn_to_page(start), order);