Re: [PATCH 3/4] lib: hexdump: make use of pr_debug

[Sascha Hauer <s.hauer@pengutronix.de>]

On Fri, Oct 17, 2025 at 02:03:35PM +0200, Marco Felsch wrote:
> The hexdump library was ported from Linux which supports different
> printk() level. Because the barebox print* facility is different
> compared to the one from Linux the barebox printk() doesn't support
> levels. Therefore the level is always set to an empty string.
> 
> Furthermore all barebox printk() calls aren't recorded by the internal
> barebox_logbuf because they are mostly used for command prints. Linux on
> the other hand record each printk() print.
> 
> Not recording the output can be an issue on systems which don't have a
> hw-console but a USB-ACM console, because the hexdump call may already
> occurred before the console was ready.
> 
> Make use of pr_debug() instead to record the output within the
> barebox_logbuf to be available later on via dmesg. Using pr_debug()
> should be fine since it is mostly used for debugging/development
> purpose.
> 
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
> ---
>  lib/hexdump.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/lib/hexdump.c b/lib/hexdump.c
> index 940c4eec64e9..ab5e3cf727ec 100644
> --- a/lib/hexdump.c
> +++ b/lib/hexdump.c
> @@ -284,16 +284,13 @@ void dev_print_hex_dump(struct device *dev, const char *level,
>  
>  		switch (prefix_type) {
>  		case DUMP_PREFIX_ADDRESS:
> -			printk("%s%s%s%p: %s\n", level, name, prefix_str,
> -			       ptr + i, linebuf);
> +			pr_debug("%s%s%p: %s\n", name, prefix_str, ptr + i, linebuf);

pr_debug is only compiled in when DEBUG is defined. This means you have
to add a "#define DEBUG" in lib/hexdump.c to make the messages visible
printed in another file, or alternatively have to define DEBUG globally.

I think we should rather replace the const char *level argument with a
unsigned int level argument expecting one of MSG_* and use pr_print() here.

Sascha

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