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: <Y8q0IfjtKPNxYHFy@hirez.programming.kicks-ass.net>
Date:   Fri, 20 Jan 2023 16:32:49 +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,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Joao Moreira <joao@...rdrivepizza.com>,
        Masami Hiramatsu <mhiramat@...nel.org>, x86@...nel.org,
        Josh Poimboeuf <jpoimboe@...hat.com>
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 03:57:48PM +0100, Peter Zijlstra wrote:
> +extern void __static_call_return(void);
> +
> +asm (".global __static_call_return\n\t"
> +     ".type __static_call_return, @function\n\t"
> +     ASM_FUNC_ALIGN "\n\t"
> +     "__static_call_return:\n\t"
	ANNOTATE_NOENDBR
	ANNOTATE_RETPOLINE_SAFE
> +     "ret; int3\n\t"
> +     ".size __static_call_return, . - __static_call_return \n\t");

are needed to quiet some objtool complaints, but otherwise this seems to
boot and build a kernel.

I suppose I had better go make these proper patches..