[U-Boot] [PATCH v2 6/8] kconfig: malloc: add option for skip memset at malloc init

[Masahiro Yamada <yamada.m@jp.panasonic.com>]

On Thu, 19 Feb 2015 11:59:07 -0700
Simon Glass <sjg@chromium.org> wrote:

> +Masahiro
> 
> Hi,
> 
> On 18 February 2015 at 05:40, Przemyslaw Marczak <p.marczak@samsung.com> wrote:
> > Hi Simon,
> >
> > On 02/18/2015 05:32 AM, Simon Glass wrote:
> >>
> >> Hi Przemyslaw,
> >>
> >> On 16 February 2015 at 08:13, Przemyslaw Marczak <p.marczak@samsung.com>
> >> wrote:
> >>>
> >>> Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
> >>> ---
> >>>   Kconfig | 26 +++++++++++++++++++-------
> >>>   1 file changed, 19 insertions(+), 7 deletions(-)
> >>>
> >>> diff --git a/Kconfig b/Kconfig
> >>> index 4157da3..e08e44a 100644
> >>> --- a/Kconfig
> >>> +++ b/Kconfig
> >>> @@ -57,13 +57,25 @@ config CC_OPTIMIZE_FOR_SIZE
> >>>            This option is enabled by default for U-Boot.
> >>
> >>
> >> Ah, you have done this. Then I think you can merge this patch with the
> >> dlmalloc patch and drop the README one.
> >>
> >
> > Shouldn't we keep both, README and Kconfig help?
> > Kconfig is just a configuration tool, README is a documentation.
> > Sometimes it could be faster to find something in the text instead of
> > config.
> 
> Agreed, but isn't it going to be a pain to add it in both places and
> keep it in sync? Maybe we could create a script which creates a
> README.kconfig containing all the options and help.
> 

I agree with Simon.

README is useful when we need a wider and more general explanation about a feature,
for ex. doc/driver-model/README.txt

Per-config explanation should be documented in Kconfig only.

Another reasone I prefer Kconfig help is:
When we remove a CONFIG from Kconfig, the documentation in a separete README
might be left over.


BTW, I did not know that U-Boot filled all the malloc space with zero.

I guess our consensus is that malloc() returns uninitialized memory.

So, I am happy with this patch.  (Perhaps, could it be enabled by default? )



Best Regards
Masahiro Yamada