linux-kernel - Re: [PATCH v2] objtool: move libelf detection to Kconfig from Makefile

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Date:   Tue, 10 Jul 2018 07:27:45 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Subject: Re: [PATCH v2] objtool: move libelf detection to Kconfig from
 Makefile


* Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> Since we switched the x86_64 default to the ORC unwinder, a lot of
> people have switched over.  But this patch will reverse (or at least
> slow down) that trend, because almost nobody has the libelf devel
> packaged installed by default.  So over time, it will effectively make
> frame pointers the default again in many cases.  That's exactly what we
> *don't* want to do.  It will also cause people to accidentally re-enable
> frame pointers when they thought they had ORC.

Yeah, agreed - turning ORC off like that is a non-starter.

Thanks,

	Ingo