From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755287Ab1C1R5b (ORCPT ); Mon, 28 Mar 2011 13:57:31 -0400 Received: from rcsinet10.oracle.com ([148.87.113.121]:63603 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754143Ab1C1R53 (ORCPT ); Mon, 28 Mar 2011 13:57:29 -0400 Message-ID: <4D90CBE5.6090706@kernel.org> Date: Mon, 28 Mar 2011 10:56:53 -0700 From: Yinghai Lu User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.14) Gecko/20110221 SUSE/3.1.8 Thunderbird/3.1.8 MIME-Version: 1.0 To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Jesse Barnes CC: "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" Subject: [PATCH] x86: Remove dma32_reserve_bootmem Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: acsmt358.oracle.com [141.146.40.158] X-Auth-Type: Internal IP X-CT-RefId: str=0001.0A090201.4D90CBF5.0072,ss=1,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org That is workaround for holding dma32 buf when early bootmem could use up those range on system that have lots of RAM. Now x86 is using memblock, and even nobootmem wrapper do top-down allocation. So We could remove those not needed code now. Signed-off-by: Yinghai Lu --- arch/x86/include/asm/pci.h | 2 - arch/x86/kernel/pci-dma.c | 64 --------------------------------------------- arch/x86/kernel/setup.c | 1 3 files changed, 67 deletions(-) Index: linux-2.6/arch/x86/include/asm/pci.h =================================================================== --- linux-2.6.orig/arch/x86/include/asm/pci.h +++ linux-2.6/arch/x86/include/asm/pci.h @@ -135,8 +135,6 @@ void default_teardown_msi_irqs(struct pc #include "pci_64.h" #endif -void dma32_reserve_bootmem(void); - /* implement the pci_ DMA API in terms of the generic device dma_ one */ #include Index: linux-2.6/arch/x86/kernel/pci-dma.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/pci-dma.c +++ linux-2.6/arch/x86/kernel/pci-dma.c @@ -68,74 +68,10 @@ int dma_set_mask(struct device *dev, u64 } EXPORT_SYMBOL(dma_set_mask); -#if defined(CONFIG_X86_64) && !defined(CONFIG_NUMA) -static __initdata void *dma32_bootmem_ptr; -static unsigned long dma32_bootmem_size __initdata = (128ULL<<20); - -static int __init parse_dma32_size_opt(char *p) -{ - if (!p) - return -EINVAL; - dma32_bootmem_size = memparse(p, &p); - return 0; -} -early_param("dma32_size", parse_dma32_size_opt); - -void __init dma32_reserve_bootmem(void) -{ - unsigned long size, align; - if (max_pfn <= MAX_DMA32_PFN) - return; - - /* - * check aperture_64.c allocate_aperture() for reason about - * using 512M as goal - */ - align = 64ULL<<20; - size = roundup(dma32_bootmem_size, align); - dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align, - 512ULL<<20); - /* - * Kmemleak should not scan this block as it may not be mapped via the - * kernel direct mapping. - */ - kmemleak_ignore(dma32_bootmem_ptr); - if (dma32_bootmem_ptr) - dma32_bootmem_size = size; - else - dma32_bootmem_size = 0; -} -static void __init dma32_free_bootmem(void) -{ - - if (max_pfn <= MAX_DMA32_PFN) - return; - - if (!dma32_bootmem_ptr) - return; - - free_bootmem(__pa(dma32_bootmem_ptr), dma32_bootmem_size); - - dma32_bootmem_ptr = NULL; - dma32_bootmem_size = 0; -} -#else -void __init dma32_reserve_bootmem(void) -{ -} -static void __init dma32_free_bootmem(void) -{ -} - -#endif - void __init pci_iommu_alloc(void) { struct iommu_table_entry *p; - /* free the range so iommu could get some range less than 4G */ - dma32_free_bootmem(); - sort_iommu_table(__iommu_table, __iommu_table_end); check_iommu_entries(__iommu_table, __iommu_table_end); Index: linux-2.6/arch/x86/kernel/setup.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/setup.c +++ linux-2.6/arch/x86/kernel/setup.c @@ -988,7 +988,6 @@ void __init setup_arch(char **cmdline_p) initmem_init(); memblock_find_dma_reserve(); - dma32_reserve_bootmem(); #ifdef CONFIG_KVM_CLOCK kvmclock_init();