linux-kernel - Re: [PATCH v4 00/28] objtool: Function validation tracing

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Message-ID: <20251118091237.GM3245006@noisy.programming.kicks-ass.net>
Date: Tue, 18 Nov 2025 10:12:37 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Alexandre Chartre <alexandre.chartre@...cle.com>
Cc: David Laight <david.laight.linux@...il.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>, linux-kernel@...r.kernel.org,
	mingo@...nel.org
Subject: Re: [PATCH v4 00/28] objtool: Function validation tracing

On Tue, Nov 18, 2025 at 08:19:14AM +0100, Alexandre Chartre wrote:

> In that specific case, they are not executed, they are after a jump:
> 
>   82e7:  __switch_to_asm+0x27  <alternative.82e7>
>                                = DEFAULT
>   82e7:  __switch_to_asm+0x27  | jmp    0x8312 <__switch_to_asm+0x52>
>   82e9:  __switch_to_asm+0x29  | NOP41

nop41 is a bit naf since x86 can only have 15 byte instructions :-)