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Date: Wed, 22 Nov 2006 18:29:14 +0000 From: Alan <alan@...rguk.ukuu.org.uk> To: <pledr@...nline.de> Cc: <linux-kernel@...r.kernel.org> Subject: Re: mapping of pages out of upper 128MB into kernel address space On 22 Nov 2006 18:05 GMT <pledr@...nline.de> wrote: > Hi, > in a kernel module I have to translate user addresses into kernel addresses. The user uses shared memory allocated with shm_open / ftruncate. This shared memory is allocated somewhere in the upmost 128MB of physical memory that is NOT permanently mapped into the kernel ( found in swapper_pg_dir ). How can I "smp_save" map this memory into the kernel address space ? See how copy_highpage and friends are used by copy_to/from_user. The kmaps are a limited resource so you can only really use them to briefly map objects in this way. Alan - 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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