dma-buf-map: Add memcpy and pointer-increment interfaces
To do framebuffer updates, one needs memcpy from system memory and a pointer-increment function. Add both interfaces with documentation. v5: * include <linux/string.h> to build on sparc64 (Sam) Signed-off-by:Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by:
Sam Ravnborg <sam@ravnborg.org> Tested-by:
Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20201103093015.1063-10-tzimmermann@suse.de
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a8595556
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