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Date: Sun, 17 Jan 2016 11:33:38 +0100
From: Borislav Petkov <bp@suse.de>
To: Brian Gerst <brgerst@gmail.com>
Cc: the arch/x86 maintainers <x86@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after
 init
Message-ID: <20160117103337.GC8549@pd.tnic>
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On Sat, Jan 16, 2016 at 02:58:21PM -0500, Brian Gerst wrote:
> It saves space.  The only thing left in main text is one jump
> instruction (5 bytes).

How do I measure this?

Because with my tailored config here, the only thing I'm seeing is a growth of
text by 730 bytes:

before:
   text    data     bss     dec     hex filename
10926552        3598944 16642048        31167544        1db9438 vmlinux

[    0.056552] Freeing SMP alternatives memory: 24K (ffffffff81dd7000 - ffffffff81ddd000)
[    2.883728] Freeing unused kernel memory: 2904K (ffffffff81b01000 - ffffffff81dd7000)


after:
   text    data     bss     dec     hex filename
10927282        3598944 16642048        31168274        1db9712 vmlinux

[    0.052559] Freeing SMP alternatives memory: 24K (ffffffff81dd7000 - ffffffff81ddd000)
[    3.225318] Freeing unused kernel memory: 2904K (ffffffff81b01000 - ffffffff81dd7000)

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--