Em Thu, 21 May 2009 12:46:04 +0800 "Figo.zhang" <figo1802@xxxxxxxxx> escreveu: > hi,all, > I am puzzle that how to mmap ( V4L2_MEMORY_MMAP) in videobuf-dma-sg.c? > > In this file, it alloc the momery using vmalloc_32() , and put this > momery into sglist table,and then use dma_map_sg() to create sg dma at > __videobuf_iolock() function. but in __videobuf_mmap_mapper(), i canot > understand how it do the mmap? > why it not use the remap_vmalloc_range() to do the mmap? The answer is simple: remap_vmalloc_range() is newer than videobuf code. This part of the code was written back to kernel 2.4, and nobody cared to update it to use those newer functions, and simplify its code. If you want, feel free to propose some cleanups on it Cheers, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
