linux-kernel - Re: [PATCH v4 0/4] objtool: Fix INSN_CONTEXT

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Message-ID: <20250409144345.GG9833@noisy.programming.kicks-ass.net>
Date: Wed, 9 Apr 2025 16:43:45 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>, Juergen Gross <jgross@...e.com>
Subject: Re: [PATCH v4 0/4] objtool: Fix INSN_CONTEXT_SWITCH

On Tue, Apr 08, 2025 at 12:02:12AM -0700, Josh Poimboeuf wrote:
> I decided to keep the "unsupported instruction in callable function"
> warning, it's not hurting anything.  As a result we now have
> INSN_SYSCALL and INSN_SYSRET.
> 
> v4:
> - split up patches
> - don't get rid of "unsupported instruction in callable function" warning
> - split INSN_CONTEXT_SWITCH -> INSN_SYSCALL / INSN_SYSRET
> 
> v3: https://lore.kernel.org/9b23e4413873bee38961e628b0c73f6d3a26d494.1743799705.git.jpoimboe@kernel.org
> 
> Josh Poimboeuf (4):
>   objtool: Fix INSN_CONTEXT_SWITCH handling in validate_unret()
>   objtool: Split INSN_CONTEXT_SWITCH into INSN_SYSCALL and INSN_SYSRET
>   objtool: Stop UNRET validation on UD2
>   objtool, xen: Fix INSN_SYSCALL / INSN_SYSRET semantics

This looks nice, thanks for doing that. Belated:

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>