linux-kernel - Re: Rewriting kernel config after generation

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Message-ID: <CACVxJT94xTVO3i7tzLwrjTkFdr3+ve2e1VBg6UjzVfvthtgDfw@mail.gmail.com>
Date:	Tue, 6 Dec 2011 13:45:49 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	mmarek@...e.cz, sam@...nborg.org
Cc:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Rewriting kernel config after generation

On Fri, Dec 2, 2011 at 7:33 AM, Alexey Dobriyan <adobriyan@...il.com> wrote:
> I'm trying to add compiling with -march=native to the kernel.
> The problem is that then some config options become discoverable at
> the beginning of the compilation. For example,
> CONFIG_X86_L1_CACHE_SHIFT=6 can be derived from "--param l1-cache-line-size=64".
> I suspect this is no-go, because all the dependency logic must be
> duplicated somewhere else (in the march=native script) for the above
> to work.
>
> Is there any cleaner way I'm missing?
>
> In theory, such script could even turn off CONFIG_CPU_SUP_AMD
> if it detects Intel CPU.

Hrph, this is harder than it looks because "silentoldconfig" is done at
the beginning rewriting whatever changes done to .config by hand. :-(
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