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Date: Sat, 17 Dec 2005 12:36:57 -0800
From: Andrew Morton <akpm@osdl.org>
To: Luke Yang <luke.adi@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Two bugs in kernel 2.6.15-rc5
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Luke Yang <luke.adi@gmail.com> wrote:
>
> Hi all,
> 
>    During porting Blackfin architecture to latest kernel, I found two issues:
> 
>  1. kernel/futex.c invokes handle_mm_fault() function, which calls
> __handle_mm_fault(). But __handle_mm_fault() is defined in
> mm/memory.c, which is only compiled when CONFIG_MMU is defined. So
> those without MMUs can not use futex any more.
> 
>    How do you think this shall be fixed? Use #ifdef CONFIG_MMU ... #endif?

See frv-make-futex-code-compilable-on-nommu.patch from recent -mm kernels.