Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933837Ab0HFFPm (ORCPT ); Fri, 6 Aug 2010 01:15:42 -0400 Received: from e23smtp02.au.ibm.com ([202.81.31.144]:57839 "EHLO e23smtp02.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933723Ab0HFFPd (ORCPT ); Fri, 6 Aug 2010 01:15:33 -0400 From: Benjamin Herrenschmidt To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, torvalds@linux-foundation.org, Benjamin Herrenschmidt Subject: [PATCH 07/43] memblock: Introduce for_each_memblock() and new accessors Date: Fri, 6 Aug 2010 15:14:48 +1000 Message-Id: <1281071724-28740-8-git-send-email-benh@kernel.crashing.org> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1281071724-28740-1-git-send-email-benh@kernel.crashing.org> References: <1281071724-28740-1-git-send-email-benh@kernel.crashing.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2758 Lines: 86 Walk memblock's using for_each_memblock() and use memblock_region_base/end_pfn() for getting to PFNs. Signed-off-by: Benjamin Herrenschmidt --- include/linux/memblock.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 52 insertions(+), 0 deletions(-) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 47bceb1..c914112 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -64,6 +64,7 @@ extern int memblock_find(struct memblock_region *res); extern void memblock_dump_all(void); +/* Obsolete accessors */ static inline u64 memblock_size_bytes(struct memblock_type *type, unsigned long region_nr) { @@ -86,6 +87,57 @@ memblock_end_pfn(struct memblock_type *type, unsigned long region_nr) memblock_size_pages(type, region_nr); } +/* + * pfn conversion functions + * + * While the memory MEMBLOCKs should always be page aligned, the reserved + * MEMBLOCKs may not be. This accessor attempt to provide a very clear + * idea of what they return for such non aligned MEMBLOCKs. + */ + +/** + * memblock_region_base_pfn - Return the lowest pfn intersecting with the region + * @reg: memblock_region structure + */ +static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg) +{ + return reg->base >> PAGE_SHIFT; +} + +/** + * memblock_region_last_pfn - Return the highest pfn intersecting with the region + * @reg: memblock_region structure + */ +static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg) +{ + return (reg->base + reg->size - 1) >> PAGE_SHIFT; +} + +/** + * memblock_region_end_pfn - Return the pfn of the first page following the region + * but not intersecting it + * @reg: memblock_region structure + */ +static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg) +{ + return memblock_region_last_pfn(reg) + 1; +} + +/** + * memblock_region_pages - Return the number of pages covering a region + * @reg: memblock_region structure + */ +static inline unsigned long memblock_region_pages(const struct memblock_region *reg) +{ + return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg); +} + +#define for_each_memblock(memblock_type, region) \ + for (region = memblock.memblock_type.regions; \ + region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \ + region++) + + #endif /* __KERNEL__ */ #endif /* _LINUX_MEMBLOCK_H */ -- 1.7.0.4 -- 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/