[PATCH V2] tiny-printf: Handle formatting of %p with an extra Kconfig

[Marek Vasut]

On 4/29/25 4:47 PM, Christoph Niedermaier wrote:
> The formatting with %pa / %pap behaves like %x, which results in an
> incorrect value being output. To improve this, a new fine-tuning
> Kconfig SPL_USE_TINY_PRINTF_POINTER_SUPPORT for pointer formatting
> has been added. If it is enabled, the output of %pa / %pap should
> be correct, and if it is disabled, the pointer formatting is
> completely unsupported. In addition to indicate unsupported formatting,
> '?' will be output. This allows enabling pointer formatting only
> when needed. For SPL_NET and NET_LWIP it is selected by default.
> Then it also supports the formatting with %pm, %pM and %pI4.
> 
> In summery this level of %p support for tiny printf is possible now:
> 
> 1) The standard tiny printf won't have support for pointer formatting.
>     So it doesn't print misleading values for %pa, instead '?' will be
>     output:
>     %p   => ?
>     %pa  => ?a
>     %pap => ?ap
> 
> 2) If SPL_USE_TINY_PRINTF_POINTER_SUPPORT is enabled or DEBUG is defined
>     tiny printf supports formatting %p and %pa / %pap.
> 
> 3) If SPL_NET or NET_LWIP is enabled the support of pointers is extended
>     for %pm, %pM and %pI4.
If you need rich printf formatting support , enable full printf instead?