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Date: Mon, 29 Aug 2011 14:27:05 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Richard Weinberger <richard@nod.at>
Cc: linux-kernel@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net,
        Al Viro <viro@ftp.linux.org.uk>, Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH 8/9] um: fix strrchr problems
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> Subject: [PATCH 8/9] um: fix strrchr problems

What are the problems?

On Mon, 29 Aug 2011 18:13:38 +0200
Richard Weinberger <richard@nod.at> wrote:

> From: Al Viro <viro@ftp.linux.org.uk>
> 
> Several years old patch, originally by jdike, I think...
> 
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> Signed-off-by: Richard Weinberger <richard@nod.at>
> ---
>  arch/um/Makefile |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/um/Makefile b/arch/um/Makefile
> index fab8121..c0f712c 100644
> --- a/arch/um/Makefile
> +++ b/arch/um/Makefile
> @@ -41,7 +41,7 @@ KBUILD_CPPFLAGS += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)
>  KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
>  	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
>  	-Din6addr_loopback=kernel_in6addr_loopback \
> -	-Din6addr_any=kernel_in6addr_any
> +	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
>  
>  KBUILD_AFLAGS += $(ARCH_INCLUDE)

z:/usr/src/linux-3.1-rc4> grep -r kernel_strrchr .       
z:/usr/src/linux-3.1-rc4> 

ok, I give up.  How does this work?