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Well what you propose here can lead to all kind of problems and is rather bad design as far as I can see. The struct dma_buf_map is only to be filled in by the exporter and should not be modified in this way by the importer. If you need to copy only a certain subset of the mapping use the functions you added in patch #1. Regards, Christian. > > Cc: Sumit Semwal > Cc: Christian König > Cc: linux-media@vger.kernel.org > Cc: dri-devel@lists.freedesktop.org > Cc: linaro-mm-sig@lists.linaro.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Lucas De Marchi > --- > include/linux/dma-buf-map.h | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > > diff --git a/include/linux/dma-buf-map.h b/include/linux/dma-buf-map.h > index 65e927d9ce33..3514a859f628 100644 > --- a/include/linux/dma-buf-map.h > +++ b/include/linux/dma-buf-map.h > @@ -131,6 +131,35 @@ struct dma_buf_map { > .is_iomem = false, \ > } > > +/** > + * DMA_BUF_MAP_INIT_OFFSET - Initializes struct dma_buf_map from another dma_buf_map > + * @map_: The dma-buf mapping structure to copy from > + * @offset: Offset to add to the other mapping > + * > + * Initializes a new dma_buf_struct based on another. This is the equivalent of doing: > + * > + * .. code-block: c > + * > + * dma_buf_map map = other_map; > + * dma_buf_map_incr(&map, &offset); > + * > + * Example usage: > + * > + * .. code-block: c > + * > + * void foo(struct device *dev, struct dma_buf_map *base_map) > + * { > + * ... > + * struct dma_buf_map = DMA_BUF_MAP_INIT_OFFSET(base_map, FIELD_OFFSET); > + * ... > + * } > + */ > +#define DMA_BUF_MAP_INIT_OFFSET(map_, offset_) (struct dma_buf_map) \ > + { \ > + .vaddr = (map_)->vaddr + (offset_), \ > + .is_iomem = (map_)->is_iomem, \ > + } > + > /** > * dma_buf_map_set_vaddr - Sets a dma-buf mapping structure to an address in system memory > * @map: The dma-buf mapping structure From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 58D04C433FE for ; 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Well what you propose here can lead to all kind of problems and is rather bad design as far as I can see. The struct dma_buf_map is only to be filled in by the exporter and should not be modified in this way by the importer. If you need to copy only a certain subset of the mapping use the functions you added in patch #1. Regards, Christian. > > Cc: Sumit Semwal > Cc: Christian König > Cc: linux-media@vger.kernel.org > Cc: dri-devel@lists.freedesktop.org > Cc: linaro-mm-sig@lists.linaro.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Lucas De Marchi > --- > include/linux/dma-buf-map.h | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > > diff --git a/include/linux/dma-buf-map.h b/include/linux/dma-buf-map.h > index 65e927d9ce33..3514a859f628 100644 > --- a/include/linux/dma-buf-map.h > +++ b/include/linux/dma-buf-map.h > @@ -131,6 +131,35 @@ struct dma_buf_map { > .is_iomem = false, \ > } > > +/** > + * DMA_BUF_MAP_INIT_OFFSET - Initializes struct dma_buf_map from another dma_buf_map > + * @map_: The dma-buf mapping structure to copy from > + * @offset: Offset to add to the other mapping > + * > + * Initializes a new dma_buf_struct based on another. This is the equivalent of doing: > + * > + * .. code-block: c > + * > + * dma_buf_map map = other_map; > + * dma_buf_map_incr(&map, &offset); > + * > + * Example usage: > + * > + * .. code-block: c > + * > + * void foo(struct device *dev, struct dma_buf_map *base_map) > + * { > + * ... > + * struct dma_buf_map = DMA_BUF_MAP_INIT_OFFSET(base_map, FIELD_OFFSET); > + * ... > + * } > + */ > +#define DMA_BUF_MAP_INIT_OFFSET(map_, offset_) (struct dma_buf_map) \ > + { \ > + .vaddr = (map_)->vaddr + (offset_), \ > + .is_iomem = (map_)->is_iomem, \ > + } > + > /** > * dma_buf_map_set_vaddr - Sets a dma-buf mapping structure to an address in system memory > * @map: The dma-buf mapping structure From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6173AC433EF for ; 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Well what you propose here can lead to all kind of problems and is rather bad design as far as I can see. The struct dma_buf_map is only to be filled in by the exporter and should not be modified in this way by the importer. If you need to copy only a certain subset of the mapping use the functions you added in patch #1. Regards, Christian. > > Cc: Sumit Semwal > Cc: Christian König > Cc: linux-media@vger.kernel.org > Cc: dri-devel@lists.freedesktop.org > Cc: linaro-mm-sig@lists.linaro.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Lucas De Marchi > --- > include/linux/dma-buf-map.h | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > > diff --git a/include/linux/dma-buf-map.h b/include/linux/dma-buf-map.h > index 65e927d9ce33..3514a859f628 100644 > --- a/include/linux/dma-buf-map.h > +++ b/include/linux/dma-buf-map.h > @@ -131,6 +131,35 @@ struct dma_buf_map { > .is_iomem = false, \ > } > > +/** > + * DMA_BUF_MAP_INIT_OFFSET - Initializes struct dma_buf_map from another dma_buf_map > + * @map_: The dma-buf mapping structure to copy from > + * @offset: Offset to add to the other mapping > + * > + * Initializes a new dma_buf_struct based on another. This is the equivalent of doing: > + * > + * .. code-block: c > + * > + * dma_buf_map map = other_map; > + * dma_buf_map_incr(&map, &offset); > + * > + * Example usage: > + * > + * .. code-block: c > + * > + * void foo(struct device *dev, struct dma_buf_map *base_map) > + * { > + * ... > + * struct dma_buf_map = DMA_BUF_MAP_INIT_OFFSET(base_map, FIELD_OFFSET); > + * ... > + * } > + */ > +#define DMA_BUF_MAP_INIT_OFFSET(map_, offset_) (struct dma_buf_map) \ > + { \ > + .vaddr = (map_)->vaddr + (offset_), \ > + .is_iomem = (map_)->is_iomem, \ > + } > + > /** > * dma_buf_map_set_vaddr - Sets a dma-buf mapping structure to an address in system memory > * @map: The dma-buf mapping structure