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

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Message-ID: <0bf737c4-db4e-4808-a609-53a4317d1412@oracle.com>
Date: Tue, 18 Nov 2025 12:39:42 +0100
From: Alexandre Chartre <alexandre.chartre@...cle.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: alexandre.chartre@...cle.com, 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 11/18/25 10:12, Peter Zijlstra wrote:
> 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 :-)

Yes, "nop1 x41" would be better for this specific case. But I think
I will just drop it for now as Josh suggested.

alex.