From: "Frank Buss" <fb@frank-buss.de>
To: "'Linux Kernel Mailing List'" <linux-kernel@vger.kernel.org>
Cc: <rmk+lkml@arm.linux.org.uk>
Subject:
Date: Wed, 23 Feb 2005 02:31:05 +0100 [thread overview]
Message-ID: <20050223013106.473AF5B8AD@frankbuss.de> (raw)
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
reply other threads:[~2005-02-23 1:31 UTC|newest]
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