linux-kernel - Re: [PATCH 10/11] x86: Remove unnecessary ifdefs from i387 code.

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Message-ID: <AANLkTinnhht86aKkmHKypmgmThJP8a1rGEXFkwyW7dc3@mail.gmail.com>
Date:	Sun, 29 Aug 2010 22:00:52 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Brian Gerst <brgerst@...il.com>
Cc:	hpa@...or.com, x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/11] x86: Remove unnecessary ifdefs from i387 code.

On Sat, Aug 28, 2010 at 7:04 PM, Brian Gerst <brgerst@...il.com> wrote:
> Remove ifdefs for code that the compiler can optimize away on 64-bit.
>
> Signed-off-by: Brian Gerst <brgerst@...il.com>

> @@ -74,10 +74,8 @@ static void __cpuinit init_thread_xstate(void)
>
>        if (cpu_has_fxsr)
>                xstate_size = sizeof(struct i387_fxsave_struct);
> -#ifdef CONFIG_X86_32
>        else
>                xstate_size = sizeof(struct i387_fsave_struct);
> -#endif
>  }

I guess this is OK but keep in mind that cpu_has_fsxr is _not_
optimized by the compiler on 64-bit so the change probably increases
kernel text by few bytes.

Acked-by: Pekka Enberg <penberg@...nel.org>
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