Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933938Ab0HFFUc (ORCPT ); Fri, 6 Aug 2010 01:20:32 -0400 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:41686 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933780Ab0HFFPg (ORCPT ); Fri, 6 Aug 2010 01:15:36 -0400 From: Benjamin Herrenschmidt To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, torvalds@linux-foundation.org, Benjamin Herrenschmidt Subject: [PATCH 32/43] memblock: Add "start" argument to memblock_find_base() Date: Fri, 6 Aug 2010 15:15:13 +1000 Message-Id: <1281071724-28740-33-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: 3243 Lines: 86 To constraint the search of a region between two boundaries, which will be used by the new NUMA aware allocator among others. Signed-off-by: Benjamin Herrenschmidt --- mm/memblock.c | 27 ++++++++++++++++----------- 1 files changed, 16 insertions(+), 11 deletions(-) diff --git a/mm/memblock.c b/mm/memblock.c index 8715f09..468ff43 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -117,19 +117,18 @@ static phys_addr_t __init memblock_find_region(phys_addr_t start, phys_addr_t en return MEMBLOCK_ERROR; } -static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr) +static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align, + phys_addr_t start, phys_addr_t end) { long i; - phys_addr_t base = 0; - phys_addr_t res_base; BUG_ON(0 == size); size = memblock_align_up(size, align); /* Pump up max_addr */ - if (max_addr == MEMBLOCK_ALLOC_ACCESSIBLE) - max_addr = memblock.current_limit; + if (end == MEMBLOCK_ALLOC_ACCESSIBLE) + end = memblock.current_limit; /* We do a top-down search, this tends to limit memory * fragmentation by keeping early boot allocs near the @@ -138,13 +137,19 @@ static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align for (i = memblock.memory.cnt - 1; i >= 0; i--) { phys_addr_t memblockbase = memblock.memory.regions[i].base; phys_addr_t memblocksize = memblock.memory.regions[i].size; + phys_addr_t bottom, top, found; if (memblocksize < size) continue; - base = min(memblockbase + memblocksize, max_addr); - res_base = memblock_find_region(memblockbase, base, size, align); - if (res_base != MEMBLOCK_ERROR) - return res_base; + if ((memblockbase + memblocksize) <= start) + break; + bottom = max(memblockbase, start); + top = min(memblockbase + memblocksize, end); + if (bottom >= top) + continue; + found = memblock_find_region(bottom, top, size, align); + if (found != MEMBLOCK_ERROR) + return found; } return MEMBLOCK_ERROR; } @@ -204,7 +209,7 @@ static int memblock_double_array(struct memblock_type *type) new_array = kmalloc(new_size, GFP_KERNEL); addr = new_array == NULL ? MEMBLOCK_ERROR : __pa(new_array); } else - addr = memblock_find_base(new_size, sizeof(phys_addr_t), MEMBLOCK_ALLOC_ACCESSIBLE); + addr = memblock_find_base(new_size, sizeof(phys_addr_t), 0, MEMBLOCK_ALLOC_ACCESSIBLE); if (addr == MEMBLOCK_ERROR) { pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n", memblock_type_name(type), type->max, type->max * 2); @@ -416,7 +421,7 @@ phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, ph */ size = memblock_align_up(size, align); - found = memblock_find_base(size, align, max_addr); + found = memblock_find_base(size, align, 0, max_addr); if (found != MEMBLOCK_ERROR && memblock_add_region(&memblock.reserved, found, size) >= 0) return found; -- 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/