linux-kernel - Re: [v3 PATCH 0/1] tracing: Add bitmask-list option for human-readable bitmask display

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Message-ID: <sm4xoemzv7d5pkyudybpxydriukvnlkwiaxrbh3qgevpnxphha@x7gberqhyjdo>
Date: Sat, 10 Jan 2026 16:06:02 -0500
From: Aaron Tomlin <atomlin@...mlin.com>
To: rostedt@...dmis.org, mhiramat@...nel.org, mark.rutland@....com, 
	mathieu.desnoyers@...icios.com, corbet@....net
Cc: sean@...e.io, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [v3 PATCH 0/1] tracing: Add bitmask-list option for
 human-readable bitmask display

On Fri, Dec 26, 2025 at 11:07:23AM -0500, Aaron Tomlin wrote:
> Hi Steve,
> 
> This patch adds support for displaying bitmasks in human-readable list
> format (e.g., 0,2-5,7) in addition to the default hexadecimal bitmap
> representation. This is particularly useful when tracing CPU masks and
> other large bitmasks where individual bit positions are more meaningful
> than their hexadecimal encoding.
> 
> When the "bitmask-list" option is enabled, the printk "%*pbl" format
> specifier is used to render bitmasks as comma-separated ranges, making
> trace output easier to interpret for complex CPU configurations and
> large bitmask values.
> 
> This iteration incorporates the use of iter->tmp_seq to ensure the
> implementation is robust, instance-aware, and free from buffer contention
> or duplication issues.
> 
> Please let me know your thoughts.

Hi Steve,

I would like to ask if this iteration is suitable for inclusion, or should
any further refinements be made?


Kind regards,
-- 
Aaron Tomlin

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