From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: jpoimboe@kernel.org, rostedt@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/12] unwind: Simplify unwind_user_next_fp() alignment check
Date: Mon, 20 Oct 2025 12:28:14 +0200 [thread overview]
Message-ID: <20251020102814.GN3419281@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20251001115524.24542fd8@gandalf.local.home>
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@infradead.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 :-)
next prev parent reply other threads:[~2025-10-21 17:19 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-24 7:59 [PATCH 00/12] Various fixes and x86 support Peter Zijlstra
2025-09-24 7:59 ` [PATCH 01/12] task_work: Fix NMI race condition Peter Zijlstra
2025-10-01 15:31 ` Steven Rostedt
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 02/12] unwind: Shorten lines Peter Zijlstra
2025-10-01 15:32 ` Steven Rostedt
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 03/12] unwind: Add required include files Peter Zijlstra
2025-10-01 15:32 ` Steven Rostedt
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 04/12] unwind: Simplify unwind_reset_info() Peter Zijlstra
2025-10-01 15:33 ` Steven Rostedt
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 05/12] unwind: Add comment to unwind_deferred_task_exit() Peter Zijlstra
2025-10-01 15:35 ` Steven Rostedt
2025-10-20 10:16 ` Peter Zijlstra
2025-10-22 15:16 ` Steven Rostedt
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 06/12] unwind: Fix unwind_deferred_request() vs NMI Peter Zijlstra
2025-10-01 15:37 ` Steven Rostedt
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 07/12] unwind: Clarify calling context Peter Zijlstra
2025-10-01 15:38 ` Steven Rostedt
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 08/12] unwind: Simplify unwind_user_faultable() Peter Zijlstra
2025-10-01 15:40 ` Steven Rostedt
2025-10-20 10:17 ` Peter Zijlstra
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 09/12] unwind: Make unwind_task_info::unwind_mask consistent Peter Zijlstra
2025-10-01 15:47 ` Steven Rostedt
2025-10-20 10:20 ` Peter Zijlstra
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 10/12] unwind: Simplify unwind_user_next_fp() alignment check Peter Zijlstra
2025-10-01 15:55 ` Steven Rostedt
2025-10-20 10:28 ` Peter Zijlstra [this message]
2025-10-22 15:20 ` Steven Rostedt
2025-10-23 9:53 ` Peter Zijlstra
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 7:59 ` [PATCH 11/12] unwind: Implement compat fp unwind Peter Zijlstra
2025-10-17 15:47 ` Jens Remus
2025-10-20 9:16 ` Jens Remus
2025-10-20 10:39 ` Peter Zijlstra
2025-10-20 10:48 ` Peter Zijlstra
2025-10-22 15:23 ` Steven Rostedt
2025-10-24 13:45 ` Peter Zijlstra
2025-10-22 14:55 ` Jens Remus
2025-10-24 13:40 ` Peter Zijlstra
2025-10-20 10:38 ` Peter Zijlstra
2025-10-22 18:31 ` Steven Rostedt
2025-10-24 14:10 ` Peter Zijlstra
2025-10-24 14:16 ` Peter Zijlstra
2025-10-29 9:36 ` [tip: perf/core] " tip-bot2 for Peter Zijlstra
2025-09-24 8:00 ` [PATCH 12/12] unwind_user/x86: Enable frame pointer unwinding on x86 Peter Zijlstra
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