Messages in this thread | | | Date | Thu, 7 Jun 2007 17:50:01 -0700 | From | "Jared Hulbert" <> | Subject | get_xip_page() uncertainity |
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I am trying to create valid "struct page* (*get_xip_page)(struct address_space *, sector_t, int)" to use the filemap_xip.c.
I've been trying to do it as follows:
virtual = ioremap(physical,size);
struct page* my_get_xip_page(struct address_space *mapping, sector_t sector, int create) { unsigned long offset; /*extract offset from mapping and sector*/ return virt_to_page(virtual + offset); }
I believe this to be fundamentally flawed. While this works for xip_file_read(), it does not work for xip_file_mmap(). I'm not sure I understand the correct way to do this. But I assume the problem, and have some evidence to support it, is that virt_to_page() is not returning a vaild page struct.
How can I get a valid page struct? The memory is not RAM but Flash. It is addressable like RAM and I want userspace to use it like readonly RAM. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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