From: Peter Zijlstra <peterz@infradead.org>
To: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: linux-toolchains@vger.kernel.org,
Indu Bhagat <indu.bhagat@oracle.com>,
Nick Desaulniers <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org,
"Jose E. Marchesi" <jemarch@gnu.org>,
Miroslav Benes <mbenes@suse.cz>,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will@kernel.org>,
x86@kernel.org, linux-arm-kernel@lists.infradead.org,
live-patching@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
Ard Biesheuvel <ardb@kernel.org>,
Chen Zhongjin <chenzhongjin@huawei.com>,
Sathvika Vasireddy <sv@linux.ibm.com>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Mark Brown <broonie@kernel.org>
Subject: Re: [RFC] Objtool toolchain proposal: -fannotate-{jump-table,noreturn}
Date: Sun, 11 Sep 2022 17:26:18 +0200 [thread overview]
Message-ID: <Yx3+GpHakZZYLM1N@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20220909180704.jwwed4zhwvin7uyi@treble>
On Fri, Sep 09, 2022 at 11:07:04AM -0700, Josh Poimboeuf wrote:
> Alternatives
> ------------
>
> Another idea which has been floated in the past is for objtool to read
> DWARF (or .eh_frame) to help it figure out the control flow. That
> hasn't been tried yet, but would be considerably more difficult and
> fragile IMO.
I though Ard played around with that a bit on ARM64. And yes, given that
most toolchains consider DWARF itself best-effort, I'm not holding my
breath there.
On top of that, building a kernel with DWARFs on is just so much
slower..
next prev parent reply other threads:[~2022-09-11 15:27 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-09 18:07 Josh Poimboeuf
2022-09-11 15:26 ` Peter Zijlstra [this message]
2022-09-11 15:31 ` Ard Biesheuvel
2022-09-12 10:52 ` Borislav Petkov
2022-09-12 14:17 ` Michael Matz
2022-09-14 0:04 ` Josh Poimboeuf
2022-09-14 14:00 ` Peter Zijlstra
2022-09-14 14:28 ` Michael Matz
2022-09-14 14:55 ` Peter Zijlstra
2022-09-14 17:34 ` Segher Boessenkool
2022-09-15 2:56 ` Chen Zhongjin
2022-09-15 8:47 ` Peter Zijlstra
2022-09-20 16:49 ` Ard Biesheuvel
2022-09-21 3:16 ` Chen Zhongjin
2022-09-12 11:31 ` Segher Boessenkool
2022-09-14 10:21 ` Josh Poimboeuf
2022-09-14 12:08 ` Michael Matz
2022-09-14 12:16 ` Segher Boessenkool
2022-09-13 22:51 ` Indu Bhagat
2022-09-14 0:12 ` Josh Poimboeuf
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