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Date: Fri, 16 May 2008 22:17:46 +0200 From: "Francis Moreau" <francis.moro@...il.com> To: "Lennart Sorensen" <lsorense@...lub.uwaterloo.ca> Cc: linux-kernel@...r.kernel.org Subject: Re: How to avoid data copies in a driver ? On Thu, May 15, 2008 at 3:59 PM, Lennart Sorensen <lsorense@...lub.uwaterloo.ca> wrote: > On Thu, May 15, 2008 at 09:44:37AM +0200, Francis Moreau wrote: >> So I would need to map this pointer into the kernel space, then fill it, take >> care of cache coherency, unmap the kernel pointer. >> >> Do you have any example of that in the kernel tree ? > > I was asking if that would work. Does the to_user and from_user work on > a pointer from user space if that pointer points at a memory mapped > file? I would say yes but I'm not really confident. -- Francis -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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