From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx159.postini.com [74.125.245.159]) by kanga.kvack.org (Postfix) with SMTP id 90BE76B003A for ; Tue, 27 Aug 2013 05:39:15 -0400 (EDT) From: Tang Chen Subject: [PATCH 03/11] memblock: Introduce lowest limit in memblock. Date: Tue, 27 Aug 2013 17:37:40 +0800 Message-Id: <1377596268-31552-4-git-send-email-tangchen@cn.fujitsu.com> In-Reply-To: <1377596268-31552-1-git-send-email-tangchen@cn.fujitsu.com> References: <1377596268-31552-1-git-send-email-tangchen@cn.fujitsu.com> Sender: owner-linux-mm@kvack.org List-ID: To: rjw@sisk.pl, lenb@kernel.org, tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com, akpm@linux-foundation.org, tj@kernel.org, trenn@suse.de, yinghai@kernel.org, jiang.liu@huawei.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, izumi.taku@jp.fujitsu.com, mgorman@suse.de, minchan@kernel.org, mina86@mina86.com, gong.chen@linux.intel.com, vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com, riel@redhat.com, jweiner@redhat.com, prarit@redhat.com, zhangyanfei@cn.fujitsu.com Cc: x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-acpi@vger.kernel.org The current memblock allocates memory from high address to low. And it has a highest limit. The next coming patches will improve memblock to be able to allocate memory from low address to high. So we need a lowest limit. Introduce current_limit_low to memblock. When users specify start address as MEMBLOCK_ALLOC_ACCESSIBLE, memblock will use current_limit_low as the low limit of allocation. Signed-off-by: Tang Chen Reviewed-by: Zhang Yanfei --- include/linux/memblock.h | 1 + mm/memblock.c | 18 +++++++++++++++--- 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index c28cd6b..40eb18e 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -35,6 +35,7 @@ struct memblock_type { }; struct memblock { + phys_addr_t current_limit_low; /* lower boundary of accessable range */ phys_addr_t current_limit_high; /* upper boundary of accessable range */ struct memblock_type memory; struct memblock_type reserved; diff --git a/mm/memblock.c b/mm/memblock.c index d351911..0dd5387 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -32,6 +32,7 @@ struct memblock memblock __initdata_memblock = { .reserved.cnt = 1, /* empty dummy entry */ .reserved.max = INIT_MEMBLOCK_REGIONS, + .current_limit_low = 0, .current_limit_high = MEMBLOCK_ALLOC_ANYWHERE, }; @@ -84,7 +85,7 @@ static long __init_memblock memblock_overlaps_region(struct memblock_type *type, /** * memblock_find_in_range_node - find free area in given range and node - * @start: start of candidate range + * @start: start of candidate range, can be %MEMBLOCK_ALLOC_ACCESSIBLE * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE} * @size: size of free area to find * @align: alignment of free area to find @@ -92,6 +93,15 @@ static long __init_memblock memblock_overlaps_region(struct memblock_type *type, * * Find @size free area aligned to @align in the specified range and node. * + * If @start is %MEMBLOCK_ALLOC_ACCESSIBLE, then set @start to + * memblock.current_limit_low which limit the lowest address memblock could + * access. %MEMBLOCK_ALLOC_ACCESSIBLE means nothing to @start. + * + * If @end is %MEMBLOCK_ALLOC_ACCESSIBLE, then set @start to + * memblock.current_limit_high which limit the highest address memblock could + * access. @end can also be %MEMBLOCK_ALLOC_ANYWHERE, which is the maximum + * physical address. + * * RETURNS: * Found address on success, %0 on failure. */ @@ -102,7 +112,9 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start, phys_addr_t this_start, this_end, cand; u64 i; - /* pump up @end */ + /* pump up @start and @end */ + if (start == MEMBLOCK_ALLOC_ACCESSIBLE) + start = memblock.current_limit_low; if (end == MEMBLOCK_ALLOC_ACCESSIBLE) end = memblock.current_limit_high; @@ -126,7 +138,7 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start, /** * memblock_find_in_range - find free area in given range - * @start: start of candidate range + * @start: start of candidate range, can be %MEMBLOCK_ALLOC_ACCESSIBLE * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE} * @size: size of free area to find * @align: alignment of free area to find -- 1.7.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org