Re: [Intel-gfx] [PATCH v2] dma-buf: Rename dma-ops to prevent conflict with kunmap_atomic macro

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Hi Logan,

Thanks for the patch.

On 20 April 2017 at 13:21, Daniel Vetter <daniel@xxxxxxxx> wrote:
> On Wed, Apr 19, 2017 at 01:36:10PM -0600, Logan Gunthorpe wrote:
>> Seeing the kunmap_atomic dma_buf_ops share the same name with a macro
>> in highmem.h, the former can be aliased if any dma-buf user includes
>> that header.
>>
>> I'm personally trying to include highmem.h inside scatterlist.h and this
>> breaks the dma-buf code proper.
>>
>> Christoph Hellwig suggested [1] renaming it and pushing this patch ASAP.
>>
>> To maintain consistency I've renamed all four of kmap* and kunmap* to be
>> map* and unmap*. (Even though only kmap_atomic presently conflicts.)
>>
>> [1] https://www.spinics.net/lists/target-devel/msg15070.html
>>
>> Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
>> Reviewed-by: Sinclair Yeh <syeh@xxxxxxxxxx>
>
> Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Acked-by: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
>
> Probably simplest if we pull this in through the drm-misc tree for 4.12.
> Can we have an ack for the v4l side for that pls?
>
> Thanks, Daniel
>
>> ---
>>
>> Changes since v1:
>>
>> - Added the missing tegra driver (noticed by kbuild robot)
>> - Rebased off of drm-intel-next to get the i915 selftest that is new
>> - Fixed nits Sinclair pointed out.
>>
>>  drivers/dma-buf/dma-buf.c                      | 16 ++++++++--------
>>  drivers/gpu/drm/armada/armada_gem.c            |  8 ++++----
>>  drivers/gpu/drm/drm_prime.c                    |  8 ++++----
>>  drivers/gpu/drm/i915/i915_gem_dmabuf.c         |  8 ++++----
>>  drivers/gpu/drm/i915/selftests/mock_dmabuf.c   |  8 ++++----
>>  drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c      |  8 ++++----
>>  drivers/gpu/drm/tegra/gem.c                    |  8 ++++----
>>  drivers/gpu/drm/udl/udl_dmabuf.c               |  8 ++++----
>>  drivers/gpu/drm/vmwgfx/vmwgfx_prime.c          |  8 ++++----
>>  drivers/media/v4l2-core/videobuf2-dma-contig.c |  4 ++--
>>  drivers/media/v4l2-core/videobuf2-dma-sg.c     |  4 ++--
>>  drivers/media/v4l2-core/videobuf2-vmalloc.c    |  4 ++--
>>  drivers/staging/android/ion/ion.c              |  8 ++++----
>>  include/linux/dma-buf.h                        | 22 +++++++++++-----------
>>  14 files changed, 61 insertions(+), 61 deletions(-)
>>
>> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
>> index f72aaac..512bdbc 100644
>> --- a/drivers/dma-buf/dma-buf.c
>> +++ b/drivers/dma-buf/dma-buf.c
>> @@ -405,8 +405,8 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
>>                         || !exp_info->ops->map_dma_buf
>>                         || !exp_info->ops->unmap_dma_buf
>>                         || !exp_info->ops->release
>> -                       || !exp_info->ops->kmap_atomic
>> -                       || !exp_info->ops->kmap
>> +                       || !exp_info->ops->map_atomic
>> +                       || !exp_info->ops->map
>>                         || !exp_info->ops->mmap)) {
>>               return ERR_PTR(-EINVAL);
>>       }
>> @@ -872,7 +872,7 @@ void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num)
>>  {
>>       WARN_ON(!dmabuf);
>>
>> -     return dmabuf->ops->kmap_atomic(dmabuf, page_num);
>> +     return dmabuf->ops->map_atomic(dmabuf, page_num);
>>  }
>>  EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic);
>>
>> @@ -889,8 +889,8 @@ void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num,
>>  {
>>       WARN_ON(!dmabuf);
>>
>> -     if (dmabuf->ops->kunmap_atomic)
>> -             dmabuf->ops->kunmap_atomic(dmabuf, page_num, vaddr);
>> +     if (dmabuf->ops->unmap_atomic)
>> +             dmabuf->ops->unmap_atomic(dmabuf, page_num, vaddr);
>>  }
>>  EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic);
>>
>> @@ -907,7 +907,7 @@ void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num)
>>  {
>>       WARN_ON(!dmabuf);
>>
>> -     return dmabuf->ops->kmap(dmabuf, page_num);
>> +     return dmabuf->ops->map(dmabuf, page_num);
>>  }
>>  EXPORT_SYMBOL_GPL(dma_buf_kmap);
>>
>> @@ -924,8 +924,8 @@ void dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long page_num,
>>  {
>>       WARN_ON(!dmabuf);
>>
>> -     if (dmabuf->ops->kunmap)
>> -             dmabuf->ops->kunmap(dmabuf, page_num, vaddr);
>> +     if (dmabuf->ops->unmap)
>> +             dmabuf->ops->unmap(dmabuf, page_num, vaddr);
>>  }
>>  EXPORT_SYMBOL_GPL(dma_buf_kunmap);
>>
>> diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c
>> index 1597458..d6c2a5d 100644
>> --- a/drivers/gpu/drm/armada/armada_gem.c
>> +++ b/drivers/gpu/drm/armada/armada_gem.c
>> @@ -529,10 +529,10 @@ static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
>>       .map_dma_buf    = armada_gem_prime_map_dma_buf,
>>       .unmap_dma_buf  = armada_gem_prime_unmap_dma_buf,
>>       .release        = drm_gem_dmabuf_release,
>> -     .kmap_atomic    = armada_gem_dmabuf_no_kmap,
>> -     .kunmap_atomic  = armada_gem_dmabuf_no_kunmap,
>> -     .kmap           = armada_gem_dmabuf_no_kmap,
>> -     .kunmap         = armada_gem_dmabuf_no_kunmap,
>> +     .map_atomic     = armada_gem_dmabuf_no_kmap,
>> +     .unmap_atomic   = armada_gem_dmabuf_no_kunmap,
>> +     .map            = armada_gem_dmabuf_no_kmap,
>> +     .unmap          = armada_gem_dmabuf_no_kunmap,
>>       .mmap           = armada_gem_dmabuf_mmap,
>>  };
>>
>> diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
>> index 9fb65b7..954eb84 100644
>> --- a/drivers/gpu/drm/drm_prime.c
>> +++ b/drivers/gpu/drm/drm_prime.c
>> @@ -403,10 +403,10 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
>>       .map_dma_buf = drm_gem_map_dma_buf,
>>       .unmap_dma_buf = drm_gem_unmap_dma_buf,
>>       .release = drm_gem_dmabuf_release,
>> -     .kmap = drm_gem_dmabuf_kmap,
>> -     .kmap_atomic = drm_gem_dmabuf_kmap_atomic,
>> -     .kunmap = drm_gem_dmabuf_kunmap,
>> -     .kunmap_atomic = drm_gem_dmabuf_kunmap_atomic,
>> +     .map = drm_gem_dmabuf_kmap,
>> +     .map_atomic = drm_gem_dmabuf_kmap_atomic,
>> +     .unmap = drm_gem_dmabuf_kunmap,
>> +     .unmap_atomic = drm_gem_dmabuf_kunmap_atomic,
>>       .mmap = drm_gem_dmabuf_mmap,
>>       .vmap = drm_gem_dmabuf_vmap,
>>       .vunmap = drm_gem_dmabuf_vunmap,
>> diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
>> index 11898cd..f225bf6 100644
>> --- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
>> +++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
>> @@ -200,10 +200,10 @@ static const struct dma_buf_ops i915_dmabuf_ops =  {
>>       .map_dma_buf = i915_gem_map_dma_buf,
>>       .unmap_dma_buf = i915_gem_unmap_dma_buf,
>>       .release = drm_gem_dmabuf_release,
>> -     .kmap = i915_gem_dmabuf_kmap,
>> -     .kmap_atomic = i915_gem_dmabuf_kmap_atomic,
>> -     .kunmap = i915_gem_dmabuf_kunmap,
>> -     .kunmap_atomic = i915_gem_dmabuf_kunmap_atomic,
>> +     .map = i915_gem_dmabuf_kmap,
>> +     .map_atomic = i915_gem_dmabuf_kmap_atomic,
>> +     .unmap = i915_gem_dmabuf_kunmap,
>> +     .unmap_atomic = i915_gem_dmabuf_kunmap_atomic,
>>       .mmap = i915_gem_dmabuf_mmap,
>>       .vmap = i915_gem_dmabuf_vmap,
>>       .vunmap = i915_gem_dmabuf_vunmap,
>> diff --git a/drivers/gpu/drm/i915/selftests/mock_dmabuf.c b/drivers/gpu/drm/i915/selftests/mock_dmabuf.c
>> index 99da8f4..302f7d1 100644
>> --- a/drivers/gpu/drm/i915/selftests/mock_dmabuf.c
>> +++ b/drivers/gpu/drm/i915/selftests/mock_dmabuf.c
>> @@ -129,10 +129,10 @@ static const struct dma_buf_ops mock_dmabuf_ops =  {
>>       .map_dma_buf = mock_map_dma_buf,
>>       .unmap_dma_buf = mock_unmap_dma_buf,
>>       .release = mock_dmabuf_release,
>> -     .kmap = mock_dmabuf_kmap,
>> -     .kmap_atomic = mock_dmabuf_kmap_atomic,
>> -     .kunmap = mock_dmabuf_kunmap,
>> -     .kunmap_atomic = mock_dmabuf_kunmap_atomic,
>> +     .map = mock_dmabuf_kmap,
>> +     .map_atomic = mock_dmabuf_kmap_atomic,
>> +     .unmap = mock_dmabuf_kunmap,
>> +     .unmap_atomic = mock_dmabuf_kunmap_atomic,
>>       .mmap = mock_dmabuf_mmap,
>>       .vmap = mock_dmabuf_vmap,
>>       .vunmap = mock_dmabuf_vunmap,
>> diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
>> index ee5883f..0dbe030 100644
>> --- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
>> +++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
>> @@ -160,10 +160,10 @@ static struct dma_buf_ops omap_dmabuf_ops = {
>>       .release = omap_gem_dmabuf_release,
>>       .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access,
>>       .end_cpu_access = omap_gem_dmabuf_end_cpu_access,
>> -     .kmap_atomic = omap_gem_dmabuf_kmap_atomic,
>> -     .kunmap_atomic = omap_gem_dmabuf_kunmap_atomic,
>> -     .kmap = omap_gem_dmabuf_kmap,
>> -     .kunmap = omap_gem_dmabuf_kunmap,
>> +     .map_atomic = omap_gem_dmabuf_kmap_atomic,
>> +     .unmap_atomic = omap_gem_dmabuf_kunmap_atomic,
>> +     .map = omap_gem_dmabuf_kmap,
>> +     .unmap = omap_gem_dmabuf_kunmap,
>>       .mmap = omap_gem_dmabuf_mmap,
>>  };
>>
>> diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
>> index 17e62ec..8672f5d 100644
>> --- a/drivers/gpu/drm/tegra/gem.c
>> +++ b/drivers/gpu/drm/tegra/gem.c
>> @@ -619,10 +619,10 @@ static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
>>       .map_dma_buf = tegra_gem_prime_map_dma_buf,
>>       .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
>>       .release = tegra_gem_prime_release,
>> -     .kmap_atomic = tegra_gem_prime_kmap_atomic,
>> -     .kunmap_atomic = tegra_gem_prime_kunmap_atomic,
>> -     .kmap = tegra_gem_prime_kmap,
>> -     .kunmap = tegra_gem_prime_kunmap,
>> +     .map_atomic = tegra_gem_prime_kmap_atomic,
>> +     .unmap_atomic = tegra_gem_prime_kunmap_atomic,
>> +     .map = tegra_gem_prime_kmap,
>> +     .unmap = tegra_gem_prime_kunmap,
>>       .mmap = tegra_gem_prime_mmap,
>>       .vmap = tegra_gem_prime_vmap,
>>       .vunmap = tegra_gem_prime_vunmap,
>> diff --git a/drivers/gpu/drm/udl/udl_dmabuf.c b/drivers/gpu/drm/udl/udl_dmabuf.c
>> index ac90ffd..ed0e636 100644
>> --- a/drivers/gpu/drm/udl/udl_dmabuf.c
>> +++ b/drivers/gpu/drm/udl/udl_dmabuf.c
>> @@ -191,10 +191,10 @@ static struct dma_buf_ops udl_dmabuf_ops = {
>>       .detach                 = udl_detach_dma_buf,
>>       .map_dma_buf            = udl_map_dma_buf,
>>       .unmap_dma_buf          = udl_unmap_dma_buf,
>> -     .kmap                   = udl_dmabuf_kmap,
>> -     .kmap_atomic            = udl_dmabuf_kmap_atomic,
>> -     .kunmap                 = udl_dmabuf_kunmap,
>> -     .kunmap_atomic          = udl_dmabuf_kunmap_atomic,
>> +     .map                    = udl_dmabuf_kmap,
>> +     .map_atomic             = udl_dmabuf_kmap_atomic,
>> +     .unmap                  = udl_dmabuf_kunmap,
>> +     .unmap_atomic           = udl_dmabuf_kunmap_atomic,
>>       .mmap                   = udl_dmabuf_mmap,
>>       .release                = drm_gem_dmabuf_release,
>>  };
>> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_prime.c b/drivers/gpu/drm/vmwgfx/vmwgfx_prime.c
>> index 31fe32d..0d42a46 100644
>> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_prime.c
>> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_prime.c
>> @@ -108,10 +108,10 @@ const struct dma_buf_ops vmw_prime_dmabuf_ops =  {
>>       .map_dma_buf = vmw_prime_map_dma_buf,
>>       .unmap_dma_buf = vmw_prime_unmap_dma_buf,
>>       .release = NULL,
>> -     .kmap = vmw_prime_dmabuf_kmap,
>> -     .kmap_atomic = vmw_prime_dmabuf_kmap_atomic,
>> -     .kunmap = vmw_prime_dmabuf_kunmap,
>> -     .kunmap_atomic = vmw_prime_dmabuf_kunmap_atomic,
>> +     .map = vmw_prime_dmabuf_kmap,
>> +     .map_atomic = vmw_prime_dmabuf_kmap_atomic,
>> +     .unmap = vmw_prime_dmabuf_kunmap,
>> +     .unmap_atomic = vmw_prime_dmabuf_kunmap_atomic,
>>       .mmap = vmw_prime_dmabuf_mmap,
>>       .vmap = vmw_prime_dmabuf_vmap,
>>       .vunmap = vmw_prime_dmabuf_vunmap,
>> diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c
>> index fb6a177..2db0413 100644
>> --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c
>> +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c
>> @@ -356,8 +356,8 @@ static struct dma_buf_ops vb2_dc_dmabuf_ops = {
>>       .detach = vb2_dc_dmabuf_ops_detach,
>>       .map_dma_buf = vb2_dc_dmabuf_ops_map,
>>       .unmap_dma_buf = vb2_dc_dmabuf_ops_unmap,
>> -     .kmap = vb2_dc_dmabuf_ops_kmap,
>> -     .kmap_atomic = vb2_dc_dmabuf_ops_kmap,
>> +     .map = vb2_dc_dmabuf_ops_kmap,
>> +     .map_atomic = vb2_dc_dmabuf_ops_kmap,
>>       .vmap = vb2_dc_dmabuf_ops_vmap,
>>       .mmap = vb2_dc_dmabuf_ops_mmap,
>>       .release = vb2_dc_dmabuf_ops_release,
>> diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c
>> index ecff8f4..6fd1343 100644
>> --- a/drivers/media/v4l2-core/videobuf2-dma-sg.c
>> +++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c
>> @@ -504,8 +504,8 @@ static struct dma_buf_ops vb2_dma_sg_dmabuf_ops = {
>>       .detach = vb2_dma_sg_dmabuf_ops_detach,
>>       .map_dma_buf = vb2_dma_sg_dmabuf_ops_map,
>>       .unmap_dma_buf = vb2_dma_sg_dmabuf_ops_unmap,
>> -     .kmap = vb2_dma_sg_dmabuf_ops_kmap,
>> -     .kmap_atomic = vb2_dma_sg_dmabuf_ops_kmap,
>> +     .map = vb2_dma_sg_dmabuf_ops_kmap,
>> +     .map_atomic = vb2_dma_sg_dmabuf_ops_kmap,
>>       .vmap = vb2_dma_sg_dmabuf_ops_vmap,
>>       .mmap = vb2_dma_sg_dmabuf_ops_mmap,
>>       .release = vb2_dma_sg_dmabuf_ops_release,
>> diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c
>> index 3f77814..27d1db3 100644
>> --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c
>> +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c
>> @@ -342,8 +342,8 @@ static struct dma_buf_ops vb2_vmalloc_dmabuf_ops = {
>>       .detach = vb2_vmalloc_dmabuf_ops_detach,
>>       .map_dma_buf = vb2_vmalloc_dmabuf_ops_map,
>>       .unmap_dma_buf = vb2_vmalloc_dmabuf_ops_unmap,
>> -     .kmap = vb2_vmalloc_dmabuf_ops_kmap,
>> -     .kmap_atomic = vb2_vmalloc_dmabuf_ops_kmap,
>> +     .map = vb2_vmalloc_dmabuf_ops_kmap,
>> +     .map_atomic = vb2_vmalloc_dmabuf_ops_kmap,
>>       .vmap = vb2_vmalloc_dmabuf_ops_vmap,
>>       .mmap = vb2_vmalloc_dmabuf_ops_mmap,
>>       .release = vb2_vmalloc_dmabuf_ops_release,
>> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
>> index f45115f..95a7f16 100644
>> --- a/drivers/staging/android/ion/ion.c
>> +++ b/drivers/staging/android/ion/ion.c
>> @@ -1020,10 +1020,10 @@ static const struct dma_buf_ops dma_buf_ops = {
>>       .release = ion_dma_buf_release,
>>       .begin_cpu_access = ion_dma_buf_begin_cpu_access,
>>       .end_cpu_access = ion_dma_buf_end_cpu_access,
>> -     .kmap_atomic = ion_dma_buf_kmap,
>> -     .kunmap_atomic = ion_dma_buf_kunmap,
>> -     .kmap = ion_dma_buf_kmap,
>> -     .kunmap = ion_dma_buf_kunmap,
>> +     .map_atomic = ion_dma_buf_kmap,
>> +     .unmap_atomic = ion_dma_buf_kunmap,
>> +     .map = ion_dma_buf_kmap,
>> +     .unmap = ion_dma_buf_kunmap,
>>  };
>>
>>  struct dma_buf *ion_share_dma_buf(struct ion_client *client,
>> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
>> index bfb3704..79f27d6 100644
>> --- a/include/linux/dma-buf.h
>> +++ b/include/linux/dma-buf.h
>> @@ -39,13 +39,13 @@ struct dma_buf_attachment;
>>
>>  /**
>>   * struct dma_buf_ops - operations possible on struct dma_buf
>> - * @kmap_atomic: maps a page from the buffer into kernel address
>> - *            space, users may not block until the subsequent unmap call.
>> - *            This callback must not sleep.
>> - * @kunmap_atomic: [optional] unmaps a atomically mapped page from the buffer.
>> - *              This Callback must not sleep.
>> - * @kmap: maps a page from the buffer into kernel address space.
>> - * @kunmap: [optional] unmaps a page from the buffer.
>> + * @map_atomic: maps a page from the buffer into kernel address
>> + *           space, users may not block until the subsequent unmap call.
>> + *           This callback must not sleep.
>> + * @unmap_atomic: [optional] unmaps a atomically mapped page from the buffer.
>> + *             This Callback must not sleep.
>> + * @map: maps a page from the buffer into kernel address space.
>> + * @unmap: [optional] unmaps a page from the buffer.
>>   * @vmap: [optional] creates a virtual mapping for the buffer into kernel
>>   *     address space. Same restrictions as for vmap and friends apply.
>>   * @vunmap: [optional] unmaps a vmap from the buffer
>> @@ -206,10 +206,10 @@ struct dma_buf_ops {
>>        * to be restarted.
>>        */
>>       int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
>> -     void *(*kmap_atomic)(struct dma_buf *, unsigned long);
>> -     void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
>> -     void *(*kmap)(struct dma_buf *, unsigned long);
>> -     void (*kunmap)(struct dma_buf *, unsigned long, void *);
>> +     void *(*map_atomic)(struct dma_buf *, unsigned long);
>> +     void (*unmap_atomic)(struct dma_buf *, unsigned long, void *);
>> +     void *(*map)(struct dma_buf *, unsigned long);
>> +     void (*unmap)(struct dma_buf *, unsigned long, void *);
>>
>>       /**
>>        * @mmap:
>> --
>> 2.1.4
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch



-- 
Thanks and regards,

Sumit Semwal
Linaro Mobile Group - Kernel Team Lead
Linaro.org │ Open source software for ARM SoCs
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