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

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Date:	Thu, 03 Jul 2014 19:10:25 -0400
From:	Boris Ostrovsky <ostr.lkml@...il.com>
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,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH] ix86: fix vDSO build

On 07/03/2014 10:35 AM, Jan Beulich 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.

Tested-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

>
> 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)
>
>
>
> --
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