linux-kernel - Re: [PATCH v1 1/2] docs: printk-formats: Fix hex printing of signed values

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Message-ID: <ZLFqivvdbzFnAAgY@alley>
Date:   Fri, 14 Jul 2023 17:32:26 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH v1 1/2] docs: printk-formats: Fix hex printing of signed
 values

On Mon 2023-07-03 17:58:38, Andy Shevchenko wrote:
> The commit cbacb5ab0aa0 ("docs: printk-formats: Stop encouraging use of
> unnecessary %h[xudi] and %hh[xudi]") obviously missed the point of sign
> promotion for the signed values lesser than int. In such case %x prints
> not the same as %h[h]x. Restore back those specifiers for the signed hex
> cases.
> 
> Fixes: cbacb5ab0aa0 ("docs: printk-formats: Stop encouraging use of unnecessary %h[xudi] and %hh[xudi]")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Makes sense. %d would print the same (small) negative number even when
casted do int. But %x would always add more "ff"s up to 4 bytes.

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr