Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759007AbYFEXJM (ORCPT ); Thu, 5 Jun 2008 19:09:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763205AbYFEXHt (ORCPT ); Thu, 5 Jun 2008 19:07:49 -0400 Received: from saeurebad.de ([85.214.36.134]:38600 "EHLO saeurebad.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763155AbYFEXHs (ORCPT ); Thu, 5 Jun 2008 19:07:48 -0400 X-Mailbox-Line: From hannes@saeurebad.de Fri Jun 6 00:57:20 2008 Message-Id: <20080605225720.203678833@saeurebad.de> References: <20080605224940.434439989@saeurebad.de> User-Agent: quilt/0.46-1 Date: Fri, 06 Jun 2008 00:49:45 +0200 From: Johannes Weiner To: Andrew Morton Cc: Ingo Molnar , Yinghai Lu , Andi Kleen , Yasunori Goto , linux-kernel@vger.kernel.org Subject: [PATCH -mm 05/14] bootmem: revisit bitmap size calculations Content-Disposition: inline; filename=bootmem-revisit-bitmap-size-calculation.patch X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.1.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2584 Lines: 87 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 --- mm/bootmem.c | 27 +++++++++------------------ 1 file changed, 9 insertions(+), 18 deletions(-) --- a/mm/bootmem.c +++ b/mm/bootmem.c @@ -50,17 +50,11 @@ early_param("bootmem_debug", bootmem_deb __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( */ unsigned long __init bootmem_bootmap_pages(unsigned long pages) { - unsigned long mapsize; - - mapsize = (pages+7)/8; - mapsize = (mapsize + ~PAGE_MASK) & PAGE_MASK; - mapsize >>= PAGE_SHIFT; + unsigned long bytes = bootmap_bytes(pages); - return mapsize; + return PAGE_ALIGN(bytes) >> PAGE_SHIFT; } /* @@ -117,7 +107,7 @@ static unsigned long __init init_bootmem * 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=%d start=%lx map=%lx end=%lx mapsize=%lx\n", @@ -160,7 +150,7 @@ static unsigned long __init free_all_boo 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_boo * 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; -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/