linux-kernel - Re: [bisected] clang 15 built kernel fails to boot, stuck at "Loading Linux 6.1.1 ...", gcc 12 built kernel with same config boots fine

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Message-ID: <Y8psdH5KRQC3bcTI@hirez.programming.kicks-ass.net>
Date:   Fri, 20 Jan 2023 11:27:00 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sandipan Das <sandipan.das@....com>
Cc:     "Erhard F." <erhard_f@...lbox.org>, linux-kernel@...r.kernel.org
Subject: Re: [bisected] clang 15 built kernel fails to boot, stuck at
 "Loading Linux 6.1.1 ...", gcc 12 built kernel with same config boots fine

On Fri, Jan 20, 2023 at 11:20:53AM +0530, Sandipan Das wrote:
> With the combination of defconfig+kvm_guest.config+localyesconfig, the only
> thing that made a difference was the compiler optimization choice. The kernel
> boots up with CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y but not with
> CONFIG_CC_OPTIMIZE_FOR_SIZE=y. Both Clang 15 and 16 kernel builds are affected.

-Os(tupid) strikes again :-)

Lemme go try that.