linux-kernel - Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by extending %p4cc

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Message-ID: <Z7ib8uH91rKdoyjP@smile.fi.intel.com>
Date: Fri, 21 Feb 2025 17:29:54 +0200
From: "andriy.shevchenko@...ux.intel.com" <andriy.shevchenko@...ux.intel.com>
To: Aditya Garg <gargaditya08@...e.com>
Cc: "pmladek@...e.com" <pmladek@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>,
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Subject: Re: [PATCH v3 2/3] lib/vsprintf: Add support for generic FOURCCs by
 extending %p4cc

On Fri, Feb 21, 2025 at 11:37:13AM +0000, Aditya Garg wrote:
> From: Hector Martin <marcan@...can.st>

First of all, I do not see the cover letter. Is it only an issue on my side?

> %p4cc is designed for DRM/V4L2 FOURCCs with their specific quirks, but
> it's useful to be able to print generic 4-character codes formatted as
> an integer. Extend it to add format specifiers for printing generic
> 32-bit FOURCCs with various endian semantics:
> 
> %p4ch   Host-endian
> %p4cl	Little-endian
> %p4cb	Big-endian
> %p4cr	Reverse-endian
> 
> The endianness determines how bytes are interpreted as a u32, and the
> FOURCC is then always printed MSByte-first (this is the opposite of
> V4L/DRM FOURCCs). This covers most practical cases, e.g. %p4cr would
> allow printing LSByte-first FOURCCs stored in host endian order
> (other than the hex form being in character order, not the integer
> value).

Second, don't issue versions too fast, give at least a few days for the
reviewers to have a chance on looking into it.

Due to above this inherits the same issues as v2, please refer to my comments
there.

-- 
With Best Regards,
Andy Shevchenko