Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932527AbdL2IVF (ORCPT ); Fri, 29 Dec 2017 03:21:05 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:44528 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932379AbdL2IVB (ORCPT ); Fri, 29 Dec 2017 03:21:01 -0500 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, adi-buildroot-devel@lists.sourceforge.net, linux-c6x-dev@linux-c6x.org, linux-cris-kernel@axis.com, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@vger.kernel.org, linux-metag@vger.kernel.org, Michal Simek , linux-mips@linux-mips.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, patches@groups.riscv.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, Guan Xuetao , x86@kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 22/67] dma-mapping: clear harmful GFP_* flags in common code Date: Fri, 29 Dec 2017 09:18:26 +0100 Message-Id: <20171229081911.2802-23-hch@lst.de> X-Mailer: git-send-email 2.14.2 In-Reply-To: <20171229081911.2802-1-hch@lst.de> References: <20171229081911.2802-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7004 Lines: 198 Life the code from x86 so that we behave consistently. In the future we should probably warn if any of these is set. Signed-off-by: Christoph Hellwig --- arch/cris/arch-v32/drivers/pci/dma.c | 3 --- arch/h8300/kernel/dma.c | 3 --- arch/m68k/kernel/dma.c | 2 -- arch/mips/cavium-octeon/dma-octeon.c | 3 --- arch/mips/loongson64/common/dma-swiotlb.c | 3 --- arch/mips/mm/dma-default.c | 3 --- arch/mips/netlogic/common/nlm-dma.c | 3 --- arch/mn10300/mm/dma-alloc.c | 3 --- arch/nios2/mm/dma-mapping.c | 3 --- arch/powerpc/kernel/dma.c | 3 --- arch/x86/kernel/pci-dma.c | 2 -- include/linux/dma-mapping.h | 7 +++++++ 12 files changed, 7 insertions(+), 31 deletions(-) diff --git a/arch/cris/arch-v32/drivers/pci/dma.c b/arch/cris/arch-v32/drivers/pci/dma.c index aa16ce27e036..c7e3056885d3 100644 --- a/arch/cris/arch-v32/drivers/pci/dma.c +++ b/arch/cris/arch-v32/drivers/pci/dma.c @@ -22,9 +22,6 @@ static void *v32_dma_alloc(struct device *dev, size_t size, { void *ret; - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); - if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff)) gfp |= GFP_DMA; diff --git a/arch/h8300/kernel/dma.c b/arch/h8300/kernel/dma.c index 0e92214310c4..4e27b74df973 100644 --- a/arch/h8300/kernel/dma.c +++ b/arch/h8300/kernel/dma.c @@ -16,9 +16,6 @@ static void *dma_alloc(struct device *dev, size_t size, { void *ret; - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); - if (dev == NULL || (*dev->dma_mask < 0xffffffff)) gfp |= GFP_DMA; ret = (void *)__get_free_pages(gfp, get_order(size)); diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c index e0167418072b..2f3492e8295c 100644 --- a/arch/m68k/kernel/dma.c +++ b/arch/m68k/kernel/dma.c @@ -76,8 +76,6 @@ static void *m68k_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) { void *ret; - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); if (dev == NULL || (*dev->dma_mask < 0xffffffff)) gfp |= GFP_DMA; diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c index c64bd87f0b6e..5baf79fce643 100644 --- a/arch/mips/cavium-octeon/dma-octeon.c +++ b/arch/mips/cavium-octeon/dma-octeon.c @@ -161,9 +161,6 @@ static void *octeon_dma_alloc_coherent(struct device *dev, size_t size, { void *ret; - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); - if (IS_ENABLED(CONFIG_ZONE_DMA) && dev == NULL) gfp |= __GFP_DMA; else if (IS_ENABLED(CONFIG_ZONE_DMA) && diff --git a/arch/mips/loongson64/common/dma-swiotlb.c b/arch/mips/loongson64/common/dma-swiotlb.c index ef07740cee61..15388c24a504 100644 --- a/arch/mips/loongson64/common/dma-swiotlb.c +++ b/arch/mips/loongson64/common/dma-swiotlb.c @@ -15,9 +15,6 @@ static void *loongson_dma_alloc_coherent(struct device *dev, size_t size, { void *ret; - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); - if ((IS_ENABLED(CONFIG_ISA) && dev == NULL) || (IS_ENABLED(CONFIG_ZONE_DMA) && dev->coherent_dma_mask < DMA_BIT_MASK(32))) diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c index 3cd93e0c7a29..6f6b1399e98e 100644 --- a/arch/mips/mm/dma-default.c +++ b/arch/mips/mm/dma-default.c @@ -93,9 +93,6 @@ static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp) { gfp_t dma_flag; - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); - #ifdef CONFIG_ISA if (dev == NULL) dma_flag = __GFP_DMA; diff --git a/arch/mips/netlogic/common/nlm-dma.c b/arch/mips/netlogic/common/nlm-dma.c index 0ec9d9da6d51..49c975b6aa28 100644 --- a/arch/mips/netlogic/common/nlm-dma.c +++ b/arch/mips/netlogic/common/nlm-dma.c @@ -47,9 +47,6 @@ static char *nlm_swiotlb; static void *nlm_dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) { - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); - #ifdef CONFIG_ZONE_DMA32 if (dev->coherent_dma_mask <= DMA_BIT_MASK(32)) gfp |= __GFP_DMA32; diff --git a/arch/mn10300/mm/dma-alloc.c b/arch/mn10300/mm/dma-alloc.c index 55876a87c247..2629f1f4b04e 100644 --- a/arch/mn10300/mm/dma-alloc.c +++ b/arch/mn10300/mm/dma-alloc.c @@ -37,9 +37,6 @@ static void *mn10300_dma_alloc(struct device *dev, size_t size, goto done; } - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); - if (dev == NULL || dev->coherent_dma_mask < 0xffffffff) gfp |= GFP_DMA; diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c index 599bcc09c9e7..9e54f8cb3459 100644 --- a/arch/nios2/mm/dma-mapping.c +++ b/arch/nios2/mm/dma-mapping.c @@ -63,9 +63,6 @@ static void *nios2_dma_alloc(struct device *dev, size_t size, { void *ret; - /* ignore region specifiers */ - gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); - /* optimized page clearing */ gfp |= __GFP_ZERO; diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c index 5d49da094a93..1723001d5de1 100644 --- a/arch/powerpc/kernel/dma.c +++ b/arch/powerpc/kernel/dma.c @@ -105,9 +105,6 @@ void *__dma_nommu_alloc_coherent(struct device *dev, size_t size, }; #endif /* CONFIG_FSL_SOC */ - /* ignore region specifiers */ - flag &= ~(__GFP_HIGHMEM); - page = alloc_pages_node(node, flag, get_order(size)); if (page == NULL) return NULL; diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 8439e6de6156..61a8f1cb3829 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -87,7 +87,6 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size, dma_mask = dma_alloc_coherent_mask(dev, flag); - flag &= ~__GFP_ZERO; again: page = NULL; /* CMA can be used only in the context which permits sleeping */ @@ -139,7 +138,6 @@ bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp) if (!*dev) *dev = &x86_dma_fallback_dev; - *gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); *gfp = dma_alloc_coherent_gfp_flags(*dev, *gfp); if (!is_device_dma_capable(*dev)) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 2779d544485c..fd5197af882a 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -525,6 +525,13 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size, if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr)) return cpu_addr; + /* + * Let the implementation decide on the zone to allocate from, and + * decide on the way of zeroing the memory given that the memory + * returned should always be zeroed. + */ + flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM | __GFP_ZERO); + if (!arch_dma_alloc_attrs(&dev, &flag)) return NULL; if (!ops->alloc) -- 2.14.2