Messages in this thread | | | From | "Frank Buss" <> | Subject | | Date | Wed, 23 Feb 2005 02:31:05 +0100 |
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Russell King <rmk+lkml@arm.linux.org.uk> wrote:
> Since we map the whole lot in one go, if you get one page, there's no > reason why you shouldn't get the lot. This is why I'm wondering if > it has something to do with your other modifications.
my colleage has found the bug: in the function dma_mmap in arch/arm/mm/consistent.c the call to remap_pfn_range uses user_size in PAGE_SIZE units, but looks like it is expected in bytes. When using (user_size << PAGE_SHIFT), it works.
I don't know, where to fix it: Should the lower level calls get the size in bytes (most function arguments in Linux kernel sources are not commented), this means fixing the dma_mmap, or should PAGE_SIZE be used, then the lower level functions needs to be fixed.
-- Frank Buß, fb@frank-buss.de http://www.frank-buss.de, http://www.it4-systems.de
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