linux-kernel - Re: [PATCH v3 1/3] mips: Use arch specific auxvec.h instead of generic-asm version

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Date:	Mon, 8 Feb 2016 17:19:14 +0000
From:	"Maciej W. Rozycki" <macro@...tec.com>
To:	Daniel Wagner <daniel.wagner@...-carit.de>
CC:	Ralf Baechle <ralf@...ux-mips.org>, <linux-kernel@...r.kernel.org>,
	<linux-mips@...ux-mips.org>
Subject: Re: [PATCH v3 1/3] mips: Use arch specific auxvec.h instead of
 generic-asm version

On Mon, 8 Feb 2016, Daniel Wagner wrote:

> The generic auxvec.h is used instead the arch specific version.
> This happens when cross compiling the kernel.
> 
> mips64-linux-gnu-gcc (GCC) 5.2.1 20151104 (Red Hat Cross 5.2.1-4)
> 
> arch/mips/kernel/../../../fs/binfmt_elf.c: In function ‘create_elf_tables’:
> ./arch/mips/include/asm/elf.h:425:14: error: ‘AT_SYSINFO_EHDR’ undeclared (first use in this function)

 There must be something wrong with your setup, or maybe a bug somewhere 
in our build machinery you just happened to trigger.  Most of us routinely 
use a cross-compiler to build the kernel and you're the first one to 
report the problem.

 Can you report the compiler invocation that has lead to this error?  
Have you used a default config or a custom one?

> diff --git a/arch/mips/include/asm/auxvec.h b/arch/mips/include/asm/auxvec.h
> new file mode 100644
> index 0000000..fbd388c
> --- /dev/null
> +++ b/arch/mips/include/asm/auxvec.h
> @@ -0,0 +1 @@
> +#include <uapi/asm/auxvec.h>

 You're not supposed to require a header in asm/ merely to include a 
header of the same name from uapi/asm/ as there are normally 
-I./arch/mips/include and -I./arch/mips/include/uapi options present both 
at once, in this order, on the compiler's invocation line.  So:

#include <asm/auxvec.h>

will pull the header from uapi/asm/ if none is present in asm/.

  Maciej