linux-kernel - Re: [PATCH V3 5/9] objtool: Add return address unwind hints

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Message-ID: <20200414161636.GP20713@hirez.programming.kicks-ass.net>
Date:   Tue, 14 Apr 2020 18:16:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexandre Chartre <alexandre.chartre@...cle.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, jpoimboe@...hat.com,
        jthierry@...hat.com, tglx@...utronix.de
Subject: Re: [PATCH V3 5/9] objtool: Add return address unwind hints

On Tue, Apr 14, 2020 at 12:36:14PM +0200, Alexandre Chartre wrote:
> Add the UNWIND_HINT_RADDR_DELETE and UNWIND_HINT_RADDR_ALTER unwind
> hint macros to flag instructions which remove or modify return
> addresses.

I'm confused by this thing; why? AFAICT the rest of the patches are
actually simpler without this one.