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Message-ID: <CADnq5_O1GNteyrrYfVHMN9CpRx5gt+Bvtr1uahR7DsSbw04TTQ@mail.gmail.com>
Date: Mon, 27 Sep 2021 11:00:14 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Sumit Semwal <sumit.semwal@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Christian König <christian.koenig@....com>,
Alex Deucher <alexander.deucher@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
DRI mailing list <dri-devel@...ts.freedesktop.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dma-buf: move dma-buf symbols into the DMA_BUF module namespace
On Mon, Sep 27, 2021 at 7:15 AM Sumit Semwal <sumit.semwal@...aro.org> wrote:
>
> Hello Greg,
>
> Thanks for the patch!
>
> On Sat, 25 Sept 2021 at 19:17, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
>>
>> In order to better track where in the kernel the dma-buf code is used,
>> put the symbols in the namespace DMA_BUF and modify all users of the
>> symbols to properly import the namespace to not break the build at the
>> same time.
>>
>> Now the output of modinfo shows the use of these symbols, making it
>> easier to watch for users over time:
>>
>> $ modinfo drivers/misc/fastrpc.ko | grep import
>> import_ns: DMA_BUF
>>
>> Cc: Sumit Semwal <sumit.semwal@...aro.org>
>> Cc: "Christian König" <christian.koenig@....com>
>> Cc: Alex Deucher <alexander.deucher@....com>
>> Cc: "Pan, Xinhui" <Xinhui.Pan@....com>
>> Cc: David Airlie <airlied@...ux.ie>
>> Cc: Daniel Vetter <daniel@...ll.ch>
>> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
>> Cc: Maxime Ripard <mripard@...nel.org>
>> Cc: Thomas Zimmermann <tzimmermann@...e.de>
>> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
>> Cc: Arnd Bergmann <arnd@...db.de>
>> Cc: dri-devel@...ts.freedesktop.org
>> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>
>
> With the addition of the 2 misses found by Arnd, please feel free to add my
> Acked-by: Sumit Semwal <sumit.semwal@...aro.org>
Same here.
Acked-by: Alex Deucher <alexander.deucher@....com>
>>
>> ---
>>
>> The topic of dma-buf came up in the Maintainer's summit yesterday, and
>> one comment was to put the symbols in their own module namespace, to
>> make it easier to notice and track who was using them. This patch does
>> so, and finds some "interesting" users of the api already in the tree.
>>
>> Only test-built on x86 allmodconfig, don't know what other arches will
>> pick up, will let 0-day run on it for a bit...
>>
>> Comments?
>>
>>
>>
>>
>> drivers/dma-buf/dma-buf.c | 34 +++++++++----------
>> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 3 ++
>> drivers/gpu/drm/drm_gem_framebuffer_helper.c | 3 ++
>> drivers/gpu/drm/drm_prime.c | 3 ++
>> drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c | 3 ++
>> drivers/gpu/drm/exynos/exynos_drm_gem.c | 3 ++
>> drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 3 ++
>> drivers/gpu/drm/tegra/gem.c | 3 ++
>> drivers/gpu/drm/vmwgfx/ttm_object.c | 3 ++
>> drivers/infiniband/core/umem_dmabuf.c | 3 ++
>> .../media/common/videobuf2/videobuf2-core.c | 1 +
>> .../common/videobuf2/videobuf2-dma-contig.c | 1 +
>> .../media/common/videobuf2/videobuf2-dma-sg.c | 1 +
>> .../common/videobuf2/videobuf2-vmalloc.c | 1 +
>> drivers/misc/fastrpc.c | 1 +
>> .../staging/media/tegra-vde/dmabuf-cache.c | 3 ++
>> drivers/tee/tee_shm.c | 3 ++
>> drivers/virtio/virtio_dma_buf.c | 1 +
>> drivers/xen/gntdev-dmabuf.c | 3 ++
>> samples/vfio-mdev/mbochs.c | 1 +
>> 20 files changed, 60 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
>> index 63d32261b63f..6c2b5ea828a6 100644
>> --- a/drivers/dma-buf/dma-buf.c
>> +++ b/drivers/dma-buf/dma-buf.c
>> @@ -610,7 +610,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
>> module_put(exp_info->owner);
>> return ERR_PTR(ret);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_export);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_export, DMA_BUF);
>>
>> /**
>> * dma_buf_fd - returns a file descriptor for the given struct dma_buf
>> @@ -634,7 +634,7 @@ int dma_buf_fd(struct dma_buf *dmabuf, int flags)
>>
>> return fd;
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_fd);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_fd, DMA_BUF);
>>
>> /**
>> * dma_buf_get - returns the struct dma_buf related to an fd
>> @@ -660,7 +660,7 @@ struct dma_buf *dma_buf_get(int fd)
>>
>> return file->private_data;
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_get);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_get, DMA_BUF);
>>
>> /**
>> * dma_buf_put - decreases refcount of the buffer
>> @@ -679,7 +679,7 @@ void dma_buf_put(struct dma_buf *dmabuf)
>>
>> fput(dmabuf->file);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_put);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_put, DMA_BUF);
>>
>> static void mangle_sg_table(struct sg_table *sg_table)
>> {
>> @@ -810,7 +810,7 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
>> dma_buf_detach(dmabuf, attach);
>> return ERR_PTR(ret);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_dynamic_attach);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_dynamic_attach, DMA_BUF);
>>
>> /**
>> * dma_buf_attach - Wrapper for dma_buf_dynamic_attach
>> @@ -825,7 +825,7 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
>> {
>> return dma_buf_dynamic_attach(dmabuf, dev, NULL, NULL);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_attach);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_attach, DMA_BUF);
>>
>> static void __unmap_dma_buf(struct dma_buf_attachment *attach,
>> struct sg_table *sg_table,
>> @@ -871,7 +871,7 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
>>
>> kfree(attach);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_detach);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_detach, DMA_BUF);
>>
>> /**
>> * dma_buf_pin - Lock down the DMA-buf
>> @@ -901,7 +901,7 @@ int dma_buf_pin(struct dma_buf_attachment *attach)
>>
>> return ret;
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_pin);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_pin, DMA_BUF);
>>
>> /**
>> * dma_buf_unpin - Unpin a DMA-buf
>> @@ -922,7 +922,7 @@ void dma_buf_unpin(struct dma_buf_attachment *attach)
>> if (dmabuf->ops->unpin)
>> dmabuf->ops->unpin(attach);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_unpin);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_unpin, DMA_BUF);
>>
>> /**
>> * dma_buf_map_attachment - Returns the scatterlist table of the attachment;
>> @@ -1012,7 +1012,7 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,
>> #endif /* CONFIG_DMA_API_DEBUG */
>> return sg_table;
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_map_attachment);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_map_attachment, DMA_BUF);
>>
>> /**
>> * dma_buf_unmap_attachment - unmaps and decreases usecount of the buffer;might
>> @@ -1048,7 +1048,7 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
>> !IS_ENABLED(CONFIG_DMABUF_MOVE_NOTIFY))
>> dma_buf_unpin(attach);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_unmap_attachment, DMA_BUF);
>>
>> /**
>> * dma_buf_move_notify - notify attachments that DMA-buf is moving
>> @@ -1068,7 +1068,7 @@ void dma_buf_move_notify(struct dma_buf *dmabuf)
>> if (attach->importer_ops)
>> attach->importer_ops->move_notify(attach);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_move_notify);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_move_notify, DMA_BUF);
>>
>> /**
>> * DOC: cpu access
>> @@ -1212,7 +1212,7 @@ int dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
>>
>> return ret;
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_begin_cpu_access, DMA_BUF);
>>
>> /**
>> * dma_buf_end_cpu_access - Must be called after accessing a dma_buf from the
>> @@ -1240,7 +1240,7 @@ int dma_buf_end_cpu_access(struct dma_buf *dmabuf,
>>
>> return ret;
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_end_cpu_access, DMA_BUF);
>>
>>
>> /**
>> @@ -1282,7 +1282,7 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
>>
>> return dmabuf->ops->mmap(dmabuf, vma);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_mmap);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_mmap, DMA_BUF);
>>
>> /**
>> * dma_buf_vmap - Create virtual mapping for the buffer object into kernel
>> @@ -1336,7 +1336,7 @@ int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
>> mutex_unlock(&dmabuf->lock);
>> return ret;
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_vmap);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_vmap, DMA_BUF);
>>
>> /**
>> * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap.
>> @@ -1360,7 +1360,7 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
>> }
>> mutex_unlock(&dmabuf->lock);
>> }
>> -EXPORT_SYMBOL_GPL(dma_buf_vunmap);
>> +EXPORT_SYMBOL_NS_GPL(dma_buf_vunmap, DMA_BUF);
>>
>> #ifdef CONFIG_DEBUG_FS
>> static int dma_buf_debug_show(struct seq_file *s, void *unused)
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> index 38dade421d46..38e144504649 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> @@ -41,6 +41,7 @@
>> #include <linux/swiotlb.h>
>> #include <linux/dma-buf.h>
>> #include <linux/sizes.h>
>> +#include <linux/module.h>
>>
>> #include <drm/ttm/ttm_bo_api.h>
>> #include <drm/ttm/ttm_bo_driver.h>
>> @@ -59,6 +60,8 @@
>> #include "amdgpu_res_cursor.h"
>> #include "bif/bif_4_1_d.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> #define AMDGPU_TTM_VRAM_MAX_DW_READ (size_t)128
>>
>> static int amdgpu_ttm_backend_bind(struct ttm_device *bdev,
>> diff --git a/drivers/gpu/drm/drm_gem_framebuffer_helper.c b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
>> index 3c75d79dbb65..746fd8c73845 100644
>> --- a/drivers/gpu/drm/drm_gem_framebuffer_helper.c
>> +++ b/drivers/gpu/drm/drm_gem_framebuffer_helper.c
>> @@ -6,6 +6,7 @@
>> */
>>
>> #include <linux/slab.h>
>> +#include <linux/module.h>
>>
>> #include <drm/drm_damage_helper.h>
>> #include <drm/drm_fb_helper.h>
>> @@ -17,6 +18,8 @@
>>
>> #include "drm_internal.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> #define AFBC_HEADER_SIZE 16
>> #define AFBC_TH_LAYOUT_ALIGNMENT 8
>> #define AFBC_HDR_ALIGN 64
>> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
>> index deb23dbec8b5..d8ba95744410 100644
>> --- a/drivers/gpu/drm/drm_prime.c
>> +++ b/drivers/gpu/drm/drm_prime.c
>> @@ -29,6 +29,7 @@
>> #include <linux/export.h>
>> #include <linux/dma-buf.h>
>> #include <linux/rbtree.h>
>> +#include <linux/module.h>
>>
>> #include <drm/drm.h>
>> #include <drm/drm_drv.h>
>> @@ -39,6 +40,8 @@
>>
>> #include "drm_internal.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> /**
>> * DOC: overview and lifetime rules
>> *
>> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
>> index 6d8bed9c739d..6788ea8490d1 100644
>> --- a/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
>> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c
>> @@ -5,10 +5,13 @@
>>
>> #include <drm/drm_prime.h>
>> #include <linux/dma-buf.h>
>> +#include <linux/module.h>
>>
>> #include "etnaviv_drv.h"
>> #include "etnaviv_gem.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> static struct lock_class_key etnaviv_prime_lock_class;
>>
>> struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
>> index 4396224227d1..0a0c042a3155 100644
>> --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
>> +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
>> @@ -9,6 +9,7 @@
>> #include <linux/dma-buf.h>
>> #include <linux/pfn_t.h>
>> #include <linux/shmem_fs.h>
>> +#include <linux/module.h>
>>
>> #include <drm/drm_prime.h>
>> #include <drm/drm_vma_manager.h>
>> @@ -17,6 +18,8 @@
>> #include "exynos_drm_drv.h"
>> #include "exynos_drm_gem.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem, bool kvmap)
>> {
>> struct drm_device *dev = exynos_gem->base.dev;
>> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> index afa34111de02..abb854281347 100644
>> --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
>> @@ -7,11 +7,14 @@
>> #include <linux/dma-buf.h>
>> #include <linux/highmem.h>
>> #include <linux/dma-resv.h>
>> +#include <linux/module.h>
>>
>> #include "i915_drv.h"
>> #include "i915_gem_object.h"
>> #include "i915_scatterlist.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> I915_SELFTEST_DECLARE(static bool force_different_devices;)
>>
>> static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf)
>> diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
>> index 6ec598f5d5b3..d38fd7e12b57 100644
>> --- a/drivers/gpu/drm/tegra/gem.c
>> +++ b/drivers/gpu/drm/tegra/gem.c
>> @@ -12,6 +12,7 @@
>>
>> #include <linux/dma-buf.h>
>> #include <linux/iommu.h>
>> +#include <linux/module.h>
>>
>> #include <drm/drm_drv.h>
>> #include <drm/drm_prime.h>
>> @@ -20,6 +21,8 @@
>> #include "drm.h"
>> #include "gem.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> static void tegra_bo_put(struct host1x_bo *bo)
>> {
>> struct tegra_bo *obj = host1x_to_tegra_bo(bo);
>> diff --git a/drivers/gpu/drm/vmwgfx/ttm_object.c b/drivers/gpu/drm/vmwgfx/ttm_object.c
>> index 04789b2bb2a2..899945f54dc7 100644
>> --- a/drivers/gpu/drm/vmwgfx/ttm_object.c
>> +++ b/drivers/gpu/drm/vmwgfx/ttm_object.c
>> @@ -48,8 +48,11 @@
>> #include <linux/spinlock.h>
>> #include <linux/slab.h>
>> #include <linux/atomic.h>
>> +#include <linux/module.h>
>> #include "ttm_object.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> /**
>> * struct ttm_object_file
>> *
>> diff --git a/drivers/infiniband/core/umem_dmabuf.c b/drivers/infiniband/core/umem_dmabuf.c
>> index e824baf4640d..2d14929543af 100644
>> --- a/drivers/infiniband/core/umem_dmabuf.c
>> +++ b/drivers/infiniband/core/umem_dmabuf.c
>> @@ -6,9 +6,12 @@
>> #include <linux/dma-buf.h>
>> #include <linux/dma-resv.h>
>> #include <linux/dma-mapping.h>
>> +#include <linux/module.h>
>>
>> #include "uverbs.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
>> {
>> struct sg_table *sgt;
>> diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
>> index 508ac295eb06..773c68dcd158 100644
>> --- a/drivers/media/common/videobuf2/videobuf2-core.c
>> +++ b/drivers/media/common/videobuf2/videobuf2-core.c
>> @@ -2978,3 +2978,4 @@ EXPORT_SYMBOL_GPL(vb2_thread_stop);
>> MODULE_DESCRIPTION("Media buffer core framework");
>> MODULE_AUTHOR("Pawel Osciak <pawel@...iak.com>, Marek Szyprowski");
>> MODULE_LICENSE("GPL");
>> +MODULE_IMPORT_NS(DMA_BUF);
>> diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
>> index a7f61ba85440..9a1a9baca2e4 100644
>> --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
>> +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
>> @@ -755,3 +755,4 @@ EXPORT_SYMBOL_GPL(vb2_dma_contig_set_max_seg_size);
>> MODULE_DESCRIPTION("DMA-contig memory handling routines for videobuf2");
>> MODULE_AUTHOR("Pawel Osciak <pawel@...iak.com>");
>> MODULE_LICENSE("GPL");
>> +MODULE_IMPORT_NS(DMA_BUF);
>> diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
>> index c5b06a509566..db90ebb8950f 100644
>> --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
>> +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
>> @@ -666,3 +666,4 @@ EXPORT_SYMBOL_GPL(vb2_dma_sg_memops);
>> MODULE_DESCRIPTION("dma scatter/gather memory handling routines for videobuf2");
>> MODULE_AUTHOR("Andrzej Pietrasiewicz");
>> MODULE_LICENSE("GPL");
>> +MODULE_IMPORT_NS(DMA_BUF);
>> diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
>> index 83f95258ec8c..fa983897d0e9 100644
>> --- a/drivers/media/common/videobuf2/videobuf2-vmalloc.c
>> +++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
>> @@ -444,3 +444,4 @@ EXPORT_SYMBOL_GPL(vb2_vmalloc_memops);
>> MODULE_DESCRIPTION("vmalloc memory handling routines for videobuf2");
>> MODULE_AUTHOR("Pawel Osciak <pawel@...iak.com>");
>> MODULE_LICENSE("GPL");
>> +MODULE_IMPORT_NS(DMA_BUF);
>> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
>> index beda610e6b30..fa5c067f1c1e 100644
>> --- a/drivers/misc/fastrpc.c
>> +++ b/drivers/misc/fastrpc.c
>> @@ -1763,3 +1763,4 @@ static void fastrpc_exit(void)
>> module_exit(fastrpc_exit);
>>
>> MODULE_LICENSE("GPL v2");
>> +MODULE_IMPORT_NS(DMA_BUF);
>> diff --git a/drivers/staging/media/tegra-vde/dmabuf-cache.c b/drivers/staging/media/tegra-vde/dmabuf-cache.c
>> index a93b317885bf..a98d03419b8f 100644
>> --- a/drivers/staging/media/tegra-vde/dmabuf-cache.c
>> +++ b/drivers/staging/media/tegra-vde/dmabuf-cache.c
>> @@ -12,9 +12,12 @@
>> #include <linux/sched.h>
>> #include <linux/slab.h>
>> #include <linux/workqueue.h>
>> +#include <linux/module.h>
>>
>> #include "vde.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> struct tegra_vde_cache_entry {
>> enum dma_data_direction dma_dir;
>> struct dma_buf_attachment *a;
>> diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
>> index 8a9384a64f3e..8a8deb95e918 100644
>> --- a/drivers/tee/tee_shm.c
>> +++ b/drivers/tee/tee_shm.c
>> @@ -10,8 +10,11 @@
>> #include <linux/slab.h>
>> #include <linux/tee_drv.h>
>> #include <linux/uio.h>
>> +#include <linux/module.h>
>> #include "tee_private.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> static void release_registered_pages(struct tee_shm *shm)
>> {
>> if (shm->pages) {
>> diff --git a/drivers/virtio/virtio_dma_buf.c b/drivers/virtio/virtio_dma_buf.c
>> index 5127a2f0c986..2521a75009c3 100644
>> --- a/drivers/virtio/virtio_dma_buf.c
>> +++ b/drivers/virtio/virtio_dma_buf.c
>> @@ -86,3 +86,4 @@ int virtio_dma_buf_get_uuid(struct dma_buf *dma_buf,
>> EXPORT_SYMBOL(virtio_dma_buf_get_uuid);
>>
>> MODULE_LICENSE("GPL");
>> +MODULE_IMPORT_NS(DMA_BUF);
>> diff --git a/drivers/xen/gntdev-dmabuf.c b/drivers/xen/gntdev-dmabuf.c
>> index 4c13cbc99896..12e380db7f55 100644
>> --- a/drivers/xen/gntdev-dmabuf.c
>> +++ b/drivers/xen/gntdev-dmabuf.c
>> @@ -14,6 +14,7 @@
>> #include <linux/slab.h>
>> #include <linux/types.h>
>> #include <linux/uaccess.h>
>> +#include <linux/module.h>
>>
>> #include <xen/xen.h>
>> #include <xen/grant_table.h>
>> @@ -21,6 +22,8 @@
>> #include "gntdev-common.h"
>> #include "gntdev-dmabuf.h"
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> +
>> #ifndef GRANT_INVALID_REF
>> /*
>> * Note on usage of grant reference 0 as invalid grant reference:
>> diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
>> index c313ab4d1f4e..a83be6cd162f 100644
>> --- a/samples/vfio-mdev/mbochs.c
>> +++ b/samples/vfio-mdev/mbochs.c
>> @@ -1493,5 +1493,6 @@ static void __exit mbochs_dev_exit(void)
>> mbochs_class = NULL;
>> }
>>
>> +MODULE_IMPORT_NS(DMA_BUF);
>> module_init(mbochs_dev_init)
>> module_exit(mbochs_dev_exit)
>> --
>> 2.33.0
>>
>
> Best,
> Sumit.
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