linux-kernel - Re: [PATCH 10/12] unwind: Simplify unwind_user_next

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Message-ID: <20251020102814.GN3419281@noisy.programming.kicks-ass.net>
Date: Mon, 20 Oct 2025 12:28:14 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: jpoimboe@...nel.org, rostedt@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/12] unwind: Simplify unwind_user_next_fp() alignment
 check

On Wed, Oct 01, 2025 at 11:55:24AM -0400, Steven Rostedt wrote:
> On Wed, 24 Sep 2025 09:59:58 +0200
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> I would add a change log. Something like:
> 
>   sizeof(long) is 4 or 8. Where 4 = 1 << 2 and 8 = 1 << 3.
>   Calculating shift to be 2 or 3 and then passing that variable into
>   (1 << shift) is the same as just using sizeof(long).

I've made it: "2^log_2(n) == n". I find it very hard to spend that many
words on something this trivial :-)