From: Marek Szyprowski <m.szyprowski@samsung.com>
To: dri-devel@lists.freedesktop.org,
iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org,
linux-kernel@vger.kernel.org
Cc: Pawel Osciak <pawel@osciak.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
David Airlie <airlied@linux.ie>,
linux-media@vger.kernel.org, Daniel Vetter <daniel@ffwll.ch>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v6 35/36] videobuf2: use sgtable-based scatterlist wrappers
Date: Thu, 18 Jun 2020 17:39:56 +0200 [thread overview]
Message-ID: <20200618153956.29558-36-m.szyprowski@samsung.com> (raw)
In-Reply-To: <20200618153956.29558-1-m.szyprowski@samsung.com>
Use recently introduced common wrappers operating directly on the struct
sg_table objects and scatterlist page iterators to make the code a bit
more compact, robust, easier to follow and copy/paste safe.
No functional change, because the code already properly did all the
scaterlist related calls.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
.../common/videobuf2/videobuf2-dma-contig.c | 41 ++++++++-----------
.../media/common/videobuf2/videobuf2-dma-sg.c | 32 ++++++---------
.../common/videobuf2/videobuf2-vmalloc.c | 12 ++----
3 files changed, 34 insertions(+), 51 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
index f4b4a7c135eb..ba01a8692d88 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
@@ -48,16 +48,15 @@ struct vb2_dc_buf {
static unsigned long vb2_dc_get_contiguous_size(struct sg_table *sgt)
{
- struct scatterlist *s;
dma_addr_t expected = sg_dma_address(sgt->sgl);
- unsigned int i;
+ struct sg_dma_page_iter dma_iter;
unsigned long size = 0;
- for_each_sg(sgt->sgl, s, sgt->nents, i) {
- if (sg_dma_address(s) != expected)
+ for_each_sgtable_dma_page(sgt, &dma_iter, 0) {
+ if (sg_page_iter_dma_address(&dma_iter) != expected)
break;
- expected = sg_dma_address(s) + sg_dma_len(s);
- size += sg_dma_len(s);
+ expected += PAGE_SIZE;
+ size += PAGE_SIZE;
}
return size;
}
@@ -99,8 +98,7 @@ static void vb2_dc_prepare(void *buf_priv)
if (!sgt || buf->db_attach)
return;
- dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir);
+ dma_sync_sgtable_for_device(buf->dev, sgt, buf->dma_dir);
}
static void vb2_dc_finish(void *buf_priv)
@@ -112,7 +110,7 @@ static void vb2_dc_finish(void *buf_priv)
if (!sgt || buf->db_attach)
return;
- dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);
+ dma_sync_sgtable_for_cpu(buf->dev, sgt, buf->dma_dir);
}
/*********************************************/
@@ -273,8 +271,8 @@ static void vb2_dc_dmabuf_ops_detach(struct dma_buf *dbuf,
* memory locations do not require any explicit cache
* maintenance prior or after being used by the device.
*/
- dma_unmap_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
sg_free_table(sgt);
kfree(attach);
db_attach->priv = NULL;
@@ -299,8 +297,8 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
/* release any previous cache */
if (attach->dma_dir != DMA_NONE) {
- dma_unmap_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
attach->dma_dir = DMA_NONE;
}
@@ -308,9 +306,8 @@ static struct sg_table *vb2_dc_dmabuf_ops_map(
* mapping to the client with new direction, no cache sync
* required see comment in vb2_dc_dmabuf_ops_detach()
*/
- sgt->nents = dma_map_sg_attrs(db_attach->dev, sgt->sgl, sgt->orig_nents,
- dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
- if (!sgt->nents) {
+ if (dma_map_sgtable(db_attach->dev, sgt, dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC)) {
pr_err("failed to map scatterlist\n");
mutex_unlock(lock);
return ERR_PTR(-EIO);
@@ -423,8 +420,8 @@ static void vb2_dc_put_userptr(void *buf_priv)
* No need to sync to CPU, it's already synced to the CPU
* since the finish() memop will have been called before this.
*/
- dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
pages = frame_vector_pages(buf->vec);
/* sgt should exist only if vector contains pages... */
BUG_ON(IS_ERR(pages));
@@ -521,9 +518,8 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
* No need to sync to the device, this will happen later when the
* prepare() memop is called.
*/
- sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
- if (sgt->nents <= 0) {
+ if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC)) {
pr_err("failed to map scatterlist\n");
ret = -EIO;
goto fail_sgt_init;
@@ -545,8 +541,7 @@ static void *vb2_dc_get_userptr(struct device *dev, unsigned long vaddr,
return buf;
fail_map_sg:
- dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
fail_sgt_init:
sg_free_table(sgt);
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
index 92072a08af25..6ddf953efa11 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
@@ -142,9 +142,8 @@ static void *vb2_dma_sg_alloc(struct device *dev, unsigned long dma_attrs,
* No need to sync to the device, this will happen later when the
* prepare() memop is called.
*/
- sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
- if (!sgt->nents)
+ if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC)) {
goto fail_map;
buf->handler.refcount = &buf->refcount;
@@ -180,8 +179,8 @@ static void vb2_dma_sg_put(void *buf_priv)
if (refcount_dec_and_test(&buf->refcount)) {
dprintk(1, "%s: Freeing buffer of %d pages\n", __func__,
buf->num_pages);
- dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
if (buf->vaddr)
vm_unmap_ram(buf->vaddr, buf->num_pages);
sg_free_table(buf->dma_sgt);
@@ -202,8 +201,7 @@ static void vb2_dma_sg_prepare(void *buf_priv)
if (buf->db_attach)
return;
- dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir);
+ dma_sync_sgtable_for_device(buf->dev, sgt, buf->dma_dir);
}
static void vb2_dma_sg_finish(void *buf_priv)
@@ -215,7 +213,7 @@ static void vb2_dma_sg_finish(void *buf_priv)
if (buf->db_attach)
return;
- dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);
+ dma_sync_sgtable_for_cpu(buf->dev, sgt, buf->dma_dir);
}
static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr,
@@ -258,9 +256,8 @@ static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr,
* No need to sync to the device, this will happen later when the
* prepare() memop is called.
*/
- sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
- buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
- if (!sgt->nents)
+ if (dma_map_sgtable(buf->dev, sgt, buf->dma_dir,
+ DMA_ATTR_SKIP_CPU_SYNC)) {
goto userptr_fail_map;
return buf;
@@ -286,8 +283,7 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
dprintk(1, "%s: Releasing userspace buffer of %d pages\n",
__func__, buf->num_pages);
- dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir,
- DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(buf->dev, sgt, buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
if (buf->vaddr)
vm_unmap_ram(buf->vaddr, buf->num_pages);
sg_free_table(buf->dma_sgt);
@@ -410,8 +406,7 @@ static void vb2_dma_sg_dmabuf_ops_detach(struct dma_buf *dbuf,
/* release the scatterlist cache */
if (attach->dma_dir != DMA_NONE)
- dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir);
sg_free_table(sgt);
kfree(attach);
db_attach->priv = NULL;
@@ -436,15 +431,12 @@ static struct sg_table *vb2_dma_sg_dmabuf_ops_map(
/* release any previous cache */
if (attach->dma_dir != DMA_NONE) {
- dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir);
attach->dma_dir = DMA_NONE;
}
/* mapping to the client with new direction */
- sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- dma_dir);
- if (!sgt->nents) {
+ if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) {
pr_err("failed to map scatterlist\n");
mutex_unlock(lock);
return ERR_PTR(-EIO);
diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
index c66fda4a65e4..bf5ac63a5742 100644
--- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c
+++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
@@ -229,7 +229,7 @@ static int vb2_vmalloc_dmabuf_ops_attach(struct dma_buf *dbuf,
kfree(attach);
return ret;
}
- for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+ for_each_sgtable_sg(sgt, sg, i) {
struct page *page = vmalloc_to_page(vaddr);
if (!page) {
@@ -259,8 +259,7 @@ static void vb2_vmalloc_dmabuf_ops_detach(struct dma_buf *dbuf,
/* release the scatterlist cache */
if (attach->dma_dir != DMA_NONE)
- dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
sg_free_table(sgt);
kfree(attach);
db_attach->priv = NULL;
@@ -285,15 +284,12 @@ static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
/* release any previous cache */
if (attach->dma_dir != DMA_NONE) {
- dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- attach->dma_dir);
+ dma_unmap_sgtable(db_attach->dev, sgt, attach->dma_dir, 0);
attach->dma_dir = DMA_NONE;
}
/* mapping to the client with new direction */
- sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
- dma_dir);
- if (!sgt->nents) {
+ if (dma_map_sgtable(db_attach->dev, sgt, dma_dir, 0)) {
pr_err("failed to map scatterlist\n");
mutex_unlock(lock);
return ERR_PTR(-EIO);
--
2.17.1
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next prev parent reply other threads:[~2020-06-18 15:40 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20200618154014eucas1p236960ab27d628f94d68a6b8ddb8b07ff@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 00/36] DRM: fix struct sg_table nents vs. orig_nents misuse Marek Szyprowski
[not found] ` <CGME20200618154014eucas1p12812b08c65f53bb216f8ac8751a309de@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 01/36] drm: prime: add common helper to check scatterlist contiguity Marek Szyprowski
2020-06-18 16:07 ` Robin Murphy
[not found] ` <CGME20200618154015eucas1p24598496fde5e7ae9039095f3cd6677b1@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 02/36] drm: prime: use sgtable iterators in drm_prime_sg_to_page_addr_arrays() Marek Szyprowski
[not found] ` <CGME20200618154016eucas1p1bd6cf758a2fe10a7c2e819b242af474f@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 03/36] drm: core: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200618154016eucas1p12cda9c412f9891f191cb9e997be9da26@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 04/36] drm: amdgpu: " Marek Szyprowski
2020-06-18 21:32 ` kernel test robot
[not found] ` <CGME20200618154017eucas1p25f266fbeb2273d9ed01b5196d698ad48@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 05/36] drm: armada: " Marek Szyprowski
[not found] ` <CGME20200618154018eucas1p1037a99bc0dc24e0ba61242e7b34c5818@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 06/36] drm: etnaviv: " Marek Szyprowski
[not found] ` <CGME20200618154018eucas1p259b2d1c250b2078772b091212325f93e@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 07/36] drm: exynos: use common helper for a scatterlist contiguity check Marek Szyprowski
[not found] ` <CGME20200618154019eucas1p256a859cb114401d51bd06d521619c9b3@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 08/36] drm: exynos: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200618154020eucas1p2b1cc0b386396bd09b735cc9d06906082@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 09/36] drm: i915: " Marek Szyprowski
[not found] ` <CGME20200618154020eucas1p2d823db666c8706f63ed352fee3c3c90c@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 10/36] drm: lima: " Marek Szyprowski
[not found] ` <CGME20200618154021eucas1p181a432ec3a813134f677263ed45f9729@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 11/36] drm: mediatek: use common helper for a scatterlist contiguity check Marek Szyprowski
[not found] ` <CGME20200618154022eucas1p1a8136b9677ac6a98ac47a3154ab0c763@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 12/36] drm: mediatek: use common helper for extracting pages array Marek Szyprowski
[not found] ` <CGME20200618154023eucas1p1613c9cd68f360fdcdaed7adf9d5abf93@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 13/36] drm: msm: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200618154023eucas1p15053efd9e4d2732b047d2a1cdda7eddb@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 14/36] drm: omapdrm: use common helper for extracting pages array Marek Szyprowski
[not found] ` <CGME20200618154024eucas1p103fa1a3752801874ae883d366639f233@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 15/36] drm: omapdrm: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200618154024eucas1p2e093781df622f8326297518f4eacd2fe@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 16/36] drm: panfrost: " Marek Szyprowski
[not found] ` <CGME20200618154025eucas1p1cf27282556c145b4a59527141a340574@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 17/36] drm: radeon: " Marek Szyprowski
[not found] ` <CGME20200618154026eucas1p27589d4e89563b89eb27459cf9743c7b4@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 18/36] drm: rockchip: use common helper for a scatterlist contiguity check Marek Szyprowski
[not found] ` <CGME20200618154027eucas1p14806dddf83e91e2e5e24d3dd4ca2fc7e@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 19/36] drm: rockchip: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200618154027eucas1p2aad00de9752e396ee41babaf78285e68@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 20/36] drm: tegra: " Marek Szyprowski
[not found] ` <CGME20200618154028eucas1p140cfc1156ef012ba74f97c5a2a7dc09e@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 21/36] drm: v3d: " Marek Szyprowski
2020-06-18 22:28 ` kernel test robot
[not found] ` <CGME20200618154029eucas1p17fb1ca5aa5a7e12fbffd1ddb15632340@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 22/36] drm: virtio: " Marek Szyprowski
[not found] ` <CGME20200618154029eucas1p274f275e89dc985634bbd309823ad0f0d@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 23/36] drm: vmwgfx: " Marek Szyprowski
2020-06-19 3:05 ` kernel test robot
2020-06-19 4:59 ` kernel test robot
[not found] ` <CGME20200618154030eucas1p2f36e6ec52cea051fccedb1970f27bef9@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 24/36] xen: gntdev: " Marek Szyprowski
[not found] ` <CGME20200618154031eucas1p15e6527663f0f925c4b8b86f051c82c0a@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 25/36] drm: host1x: " Marek Szyprowski
[not found] ` <CGME20200618154032eucas1p25df137bd9c481bcbc39320f0167b225a@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 26/36] drm: rcar-du: " Marek Szyprowski
[not found] ` <CGME20200618154032eucas1p207c05c83d16e48c5a48ebd1e7d2862d1@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 27/36] dmabuf: " Marek Szyprowski
[not found] ` <CGME20200618154033eucas1p1d061fbc72e2eed8d475ab170f9a2fbf0@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 28/36] staging: ion: remove dead code Marek Szyprowski
[not found] ` <CGME20200618154034eucas1p1f76546f76920c48a8407bb6737a41fb8@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 29/36] staging: ion: fix common struct sg_table related issues Marek Szyprowski
[not found] ` <CGME20200618154035eucas1p24774788a08a2d2a0a7e24c8755c885ed@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 30/36] staging: tegra-vde: " Marek Szyprowski
[not found] ` <CGME20200618154036eucas1p2f4ba8a422fcf2843627d639cd193c90f@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 31/36] misc: fastrpc: " Marek Szyprowski
[not found] ` <CGME20200618154036eucas1p2d98ca6915b554409e1f02114657680c0@eucas1p2.samsung.com>
2020-06-18 15:39 ` [PATCH v6 32/36] rapidio: " Marek Szyprowski
2020-06-18 23:39 ` kernel test robot
[not found] ` <CGME20200618154037eucas1p19a60af169ef9c272b9d1eecf589f6627@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 33/36] samples: vfio-mdev/mbochs: " Marek Szyprowski
[not found] ` <CGME20200618154038eucas1p18eae40b8fbf97a3e42abef8eb14da946@eucas1p1.samsung.com>
2020-06-18 15:39 ` [PATCH v6 34/36] media: pci: fix common ALSA DMA-mapping related codes Marek Szyprowski
[not found] ` <CGME20200618154038eucas1p1acd4fcdd183de4c19c4004778527a755@eucas1p1.samsung.com>
2020-06-18 15:39 ` Marek Szyprowski [this message]
2020-06-19 0:34 ` [PATCH v6 35/36] videobuf2: use sgtable-based scatterlist wrappers kernel test robot
2020-06-19 9:43 ` Robin Murphy
[not found] ` <CGME20200618160120eucas1p20b771c3b6dc06549c7f4a4d569c3e0ec@eucas1p2.samsung.com>
2020-06-18 16:01 ` [PATCH v6 36/36] drm: xen: fix common struct sg_table related issues Marek Szyprowski
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