linux-kernel - Re: [PATCH 3/3] x86/boot: avoid recompiling kaslr.c for incremental rebuilds

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Message-ID: <202402201133.3FC7CE9@keescook>
Date: Tue, 20 Feb 2024 11:34:45 -0800
From: Kees Cook <keescook@...omium.org>
To: Jann Horn <jannh@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] x86/boot: avoid recompiling kaslr.c for incremental
 rebuilds

On Tue, Feb 20, 2024 at 08:21:44PM +0100, Jann Horn wrote:
> Currently, every kernel rebuild needs to compile kaslr.c again because
> UTS_VERSION changes on every rebuild.
> Move the build string into a separate object file to speed things up.

Heh, I think I don't see this because I force my UTS_VERSION to stay
still by default so I can do binary difference comparisons more easily. :P

args += ['KBUILD_BUILD_TIMESTAMP=1970-01-01']
args += ['KBUILD_BUILD_VERSION=1']
args += ['KBUILD_BUILD_USER=user']
args += ['KBUILD_BUILD_HOST=host']


-- 
Kees Cook