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dma-mapping: clear harmful GFP_* flags in common code

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Lift 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 <hch@lst.de>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
This commit is contained in:
Christoph Hellwig 2017-12-22 16:05:15 +01:00
parent 205e1b7f51
commit 57bf5a8963
12 changed files with 7 additions and 31 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
arch/cris/arch-v32/drivers/pci/dma.c
View file

@ -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;

3
arch/h8300/kernel/dma.c
View file

@ -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));

2
arch/m68k/kernel/dma.c
View file

@ -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;

3
arch/mips/cavium-octeon/dma-octeon.c
View file

@ -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) &&

3
arch/mips/loongson64/common/dma-swiotlb.c
View file

@ -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)))

3
arch/mips/mm/dma-default.c
View file

@ -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;

3
arch/mips/netlogic/common/nlm-dma.c
View file

@ -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;

3
arch/mn10300/mm/dma-alloc.c
View file

@ -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;

3
arch/nios2/mm/dma-mapping.c
View file

@ -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;

3
arch/powerpc/kernel/dma.c
View file

@ -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;

2
arch/x86/kernel/pci-dma.c
View file

@ -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))

7
include/linux/dma-mapping.h
View file

@ -518,6 +518,13 @@ 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)