On Mon, 9 Jul 2018 13:20 Marek Szyprowski, wrote: > The CMA memory allocator doesn't support standard gfp flags for memory > allocation, so there is no point having it as a parameter for > dma_alloc_from_contiguous() function. Replace it by a boolean no_warn > argument, which covers all the underlaying cma_alloc() function supports. > > This will help to avoid giving false feeling that this function supports > standard gfp flags and callers can pass __GFP_ZERO to get zeroed buffer, > what has already been an issue: see commit dd65a941f6ba ("arm64: > dma-mapping: clear buffers allocated with FORCE_CONTIGUOUS flag"). > > Signed-off-by: Marek Szyprowski > Acked-by: Michał Nazarewicz --- > arch/arm/mm/dma-mapping.c | 5 +++-- > arch/arm64/mm/dma-mapping.c | 4 ++-- > arch/xtensa/kernel/pci-dma.c | 2 +- > drivers/iommu/amd_iommu.c | 2 +- > drivers/iommu/intel-iommu.c | 3 ++- > include/linux/dma-contiguous.h | 4 ++-- > kernel/dma/contiguous.c | 7 +++---- > kernel/dma/direct.c | 3 ++- > 8 files changed, 16 insertions(+), 14 deletions(-) > > diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c > index be0fa7e39c26..121c6c3ba9e0 100644 > --- a/arch/arm/mm/dma-mapping.c > +++ b/arch/arm/mm/dma-mapping.c > @@ -594,7 +594,7 @@ static void *__alloc_from_contiguous(struct device > *dev, size_t size, > struct page *page; > void *ptr = NULL; > > - page = dma_alloc_from_contiguous(dev, count, order, gfp); > + page = dma_alloc_from_contiguous(dev, count, order, gfp & > __GFP_NOWARN); > if (!page) > return NULL; > > @@ -1294,7 +1294,8 @@ static struct page **__iommu_alloc_buffer(struct > device *dev, size_t size, > unsigned long order = get_order(size); > struct page *page; > > - page = dma_alloc_from_contiguous(dev, count, order, gfp); > + page = dma_alloc_from_contiguous(dev, count, order, > + gfp & __GFP_NOWARN); > if (!page) > goto error; > > diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c > index 61e93f0b5482..072c51fb07d7 100644 > --- a/arch/arm64/mm/dma-mapping.c > +++ b/arch/arm64/mm/dma-mapping.c > @@ -355,7 +355,7 @@ static int __init atomic_pool_init(void) > > if (dev_get_cma_area(NULL)) > page = dma_alloc_from_contiguous(NULL, nr_pages, > - pool_size_order, > GFP_KERNEL); > + pool_size_order, false); > else > page = alloc_pages(GFP_DMA32, pool_size_order); > > @@ -573,7 +573,7 @@ static void *__iommu_alloc_attrs(struct device *dev, > size_t size, > struct page *page; > > page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT, > - get_order(size), gfp); > + get_order(size), gfp & > __GFP_NOWARN); > if (!page) > return NULL; > > diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c > index ba4640cc0093..b2c7ba91fb08 100644 > --- a/arch/xtensa/kernel/pci-dma.c > +++ b/arch/xtensa/kernel/pci-dma.c > @@ -137,7 +137,7 @@ static void *xtensa_dma_alloc(struct device *dev, > size_t size, > > if (gfpflags_allow_blocking(flag)) > page = dma_alloc_from_contiguous(dev, count, > get_order(size), > - flag); > + flag & __GFP_NOWARN); > > if (!page) > page = alloc_pages(flag, get_order(size)); > diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c > index 64cfe854e0f5..5ec97ffb561a 100644 > --- a/drivers/iommu/amd_iommu.c > +++ b/drivers/iommu/amd_iommu.c > @@ -2622,7 +2622,7 @@ static void *alloc_coherent(struct device *dev, > size_t size, > return NULL; > > page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT, > - get_order(size), flag); > + get_order(size), flag & > __GFP_NOWARN); > if (!page) > return NULL; > } > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c > index 869321c594e2..dd2d343428ab 100644 > --- a/drivers/iommu/intel-iommu.c > +++ b/drivers/iommu/intel-iommu.c > @@ -3746,7 +3746,8 @@ static void *intel_alloc_coherent(struct device > *dev, size_t size, > if (gfpflags_allow_blocking(flags)) { > unsigned int count = size >> PAGE_SHIFT; > > - page = dma_alloc_from_contiguous(dev, count, order, flags); > + page = dma_alloc_from_contiguous(dev, count, order, > + flags & __GFP_NOWARN); > if (page && iommu_no_mapping(dev) && > page_to_phys(page) + size > dev->coherent_dma_mask) { > dma_release_from_contiguous(dev, page, count); > diff --git a/include/linux/dma-contiguous.h > b/include/linux/dma-contiguous.h > index 3c5a4cb3eb95..f247e8aa5e3d 100644 > --- a/include/linux/dma-contiguous.h > +++ b/include/linux/dma-contiguous.h > @@ -112,7 +112,7 @@ static inline int dma_declare_contiguous(struct device > *dev, phys_addr_t size, > } > > struct page *dma_alloc_from_contiguous(struct device *dev, size_t count, > - unsigned int order, gfp_t gfp_mask); > + unsigned int order, bool no_warn); > bool dma_release_from_contiguous(struct device *dev, struct page *pages, > int count); > > @@ -145,7 +145,7 @@ int dma_declare_contiguous(struct device *dev, > phys_addr_t size, > > static inline > struct page *dma_alloc_from_contiguous(struct device *dev, size_t count, > - unsigned int order, gfp_t gfp_mask) > + unsigned int order, bool no_warn) > { > return NULL; > } > diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c > index 19ea5d70150c..286d82329eb0 100644 > --- a/kernel/dma/contiguous.c > +++ b/kernel/dma/contiguous.c > @@ -178,7 +178,7 @@ int __init dma_contiguous_reserve_area(phys_addr_t > size, phys_addr_t base, > * @dev: Pointer to device for which the allocation is performed. > * @count: Requested number of pages. > * @align: Requested alignment of pages (in PAGE_SIZE order). > - * @gfp_mask: GFP flags to use for this allocation. > + * @no_warn: Avoid printing message about failed allocation. > * > * This function allocates memory buffer for specified device. It uses > * device specific contiguous memory area if available or the default > @@ -186,13 +186,12 @@ int __init dma_contiguous_reserve_area(phys_addr_t > size, phys_addr_t base, > * function. > */ > struct page *dma_alloc_from_contiguous(struct device *dev, size_t count, > - unsigned int align, gfp_t gfp_mask) > + unsigned int align, bool no_warn) > { > if (align > CONFIG_CMA_ALIGNMENT) > align = CONFIG_CMA_ALIGNMENT; > > - return cma_alloc(dev_get_cma_area(dev), count, align, > - gfp_mask & __GFP_NOWARN); > + return cma_alloc(dev_get_cma_area(dev), count, align, no_warn); > } > > /** > diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c > index 8be8106270c2..e0241beeb645 100644 > --- a/kernel/dma/direct.c > +++ b/kernel/dma/direct.c > @@ -78,7 +78,8 @@ void *dma_direct_alloc(struct device *dev, size_t size, > dma_addr_t *dma_handle, > again: > /* CMA can be used only in the context which permits sleeping */ > if (gfpflags_allow_blocking(gfp)) { > - page = dma_alloc_from_contiguous(dev, count, page_order, > gfp); > + page = dma_alloc_from_contiguous(dev, count, page_order, > + gfp & __GFP_NOWARN); > if (page && !dma_coherent_ok(dev, page_to_phys(page), > size)) { > dma_release_from_contiguous(dev, page, count); > page = NULL; > -- > 2.17.1 > >