dma-mapping: use unsigned long for dma_attrs
The dma-mapping core and the implementations do not change the DMA
attributes passed by pointer. Thus the pointer can point to const data.
However the attributes do not have to be a bitfield. Instead unsigned
long will do fine:
1. This is just simpler. Both in terms of reading the code and setting
attributes. Instead of initializing local attributes on the stack
and passing pointer to it to dma_set_attr(), just set the bits.
2. It brings safeness and checking for const correctness because the
attributes are passed by value.
Semantic patches for this change (at least most of them):
virtual patch
virtual context
@r@
identifier f, attrs;
@@
f(...,
- struct dma_attrs *attrs
+ unsigned long attrs
, ...)
{
...
}
@@
identifier r.f;
@@
f(...,
- NULL
+ 0
)
and
// Options: --all-includes
virtual patch
virtual context
@r@
identifier f, attrs;
type t;
@@
t f(..., struct dma_attrs *attrs);
@@
identifier r.f;
@@
f(...,
- NULL
+ 0
)
Link: http://lkml.kernel.org/r/1468399300-5399-2-git-send-email-k.kozlowski@samsung.com
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>
Acked-by: Mark Salter <msalter@redhat.com> [c6x]
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> [cris]
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> [drm]
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Fabien Dessenne <fabien.dessenne@st.com> [bdisp]
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> [vb2-core]
Acked-by: David Vrabel <david.vrabel@citrix.com> [xen]
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [xen swiotlb]
Acked-by: Joerg Roedel <jroedel@suse.de> [iommu]
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon]
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [s390]
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> [avr32]
Acked-by: Vineet Gupta <vgupta@synopsys.com> [arc]
Acked-by: Robin Murphy <robin.murphy@arm.com> [arm64 and dma-iommu]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index cdf9f1a..f2ae72b 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -24,7 +24,7 @@
static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
{
struct drm_device *dev = exynos_gem->base.dev;
- enum dma_attr attr;
+ unsigned long attr;
unsigned int nr_pages;
struct sg_table sgt;
int ret = -ENOMEM;
@@ -34,7 +34,7 @@
return 0;
}
- init_dma_attrs(&exynos_gem->dma_attrs);
+ exynos_gem->dma_attrs = 0;
/*
* if EXYNOS_BO_CONTIG, fully physically contiguous memory
@@ -42,7 +42,7 @@
* as possible.
*/
if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
- dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &exynos_gem->dma_attrs);
+ exynos_gem->dma_attrs |= DMA_ATTR_FORCE_CONTIGUOUS;
/*
* if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
@@ -54,8 +54,8 @@
else
attr = DMA_ATTR_NON_CONSISTENT;
- dma_set_attr(attr, &exynos_gem->dma_attrs);
- dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &exynos_gem->dma_attrs);
+ exynos_gem->dma_attrs |= attr;
+ exynos_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
nr_pages = exynos_gem->size >> PAGE_SHIFT;
@@ -67,7 +67,7 @@
exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
&exynos_gem->dma_addr, GFP_KERNEL,
- &exynos_gem->dma_attrs);
+ exynos_gem->dma_attrs);
if (!exynos_gem->cookie) {
DRM_ERROR("failed to allocate buffer.\n");
goto err_free;
@@ -75,7 +75,7 @@
ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
- &exynos_gem->dma_attrs);
+ exynos_gem->dma_attrs);
if (ret < 0) {
DRM_ERROR("failed to get sgtable.\n");
goto err_dma_free;
@@ -99,7 +99,7 @@
sg_free_table(&sgt);
err_dma_free:
dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
- exynos_gem->dma_addr, &exynos_gem->dma_attrs);
+ exynos_gem->dma_addr, exynos_gem->dma_attrs);
err_free:
drm_free_large(exynos_gem->pages);
@@ -120,7 +120,7 @@
dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
(dma_addr_t)exynos_gem->dma_addr,
- &exynos_gem->dma_attrs);
+ exynos_gem->dma_attrs);
drm_free_large(exynos_gem->pages);
}
@@ -346,7 +346,7 @@
ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
exynos_gem->dma_addr, exynos_gem->size,
- &exynos_gem->dma_attrs);
+ exynos_gem->dma_attrs);
if (ret < 0) {
DRM_ERROR("failed to mmap.\n");
return ret;