linux-kernel - Re: [PATCH] ix86: fix vDSO build

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Message-Id: <20140709163034.2d93541a7af85fa71fddd17b@linux-foundation.org>
Date:	Wed, 9 Jul 2014 16:30:34 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Jan Beulich" <JBeulich@...e.com>
Cc:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>,
	"Andy Lutomirski" <luto@...capital.net>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ix86: fix vDSO build

On Thu, 03 Jul 2014 15:35:07 +0100 "Jan Beulich" <JBeulich@...e.com> wrote:

> Relying on static functions used just once to get inlined (and
> subsequently have dead code paths eliminated) is wrong: Compilers are
> free to decide whether they do this, regardless of optimization level.
> With this not happening for vdso_addr() (observed with gcc 4.1.x), an
> unresolved reference to align_vdso_addr() causes the build to fail.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
> Cc: Andy Lutomirski <luto@...capital.net>
> ---
>  arch/x86/vdso/vma.c    |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> --- 3.16-rc3/arch/x86/vdso/vma.c
> +++ 3.16-rc3-x86-vdso-build/arch/x86/vdso/vma.c
> @@ -62,6 +62,9 @@ struct linux_binprm;
>     Only used for the 64-bit and x32 vdsos. */
>  static unsigned long vdso_addr(unsigned long start, unsigned len)
>  {
> +#ifdef CONFIG_X86_32
> +	return 0;
> +#else
>  	unsigned long addr, end;
>  	unsigned offset;
>  	end = (start + PMD_SIZE - 1) & PMD_MASK;
> @@ -83,6 +86,7 @@ static unsigned long vdso_addr(unsigned
>  	addr = align_vdso_addr(addr);
>  
>  	return addr;
> +#endif
>  }
>  
>  static int map_vdso(const struct vdso_image *image, bool calculate_addr)

Tested-by: Andrew Morton <akpm@...ux-foundation.org>
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