Re: [PATCH v2] init: Do not select DEBUG_KERNEL by default

[Josh Triplett]

On April 10, 2019 3:58:55 PM PDT, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>On Wed, Apr 10, 2019 at 3:42 PM Sinan Kaya <okaya@xxxxxxxxxx> wrote:
>>
>> We can't seem to have a kernel with CONFIG_EXPERT set but
>> CONFIG_DEBUG_KERNEL unset these days.
>>
>> While some of the features under the CONFIG_EXPERT require
>> CONFIG_DEBUG_KERNEL, it doesn't apply for all features.
>>
>> It looks like CONFIG_KALLSYMS_ALL is the only feature that
>> requires CONFIG_DEBUG_KERNEL.
>>
>> Select CONFIG_EXPERT when CONFIG_DEBUG is chosen but you can
>
>Typo: CONFIG_DEBUG_KERNEL
>
>> still choose CONFIG_EXPERT without CONFIG_DEBUG.
>
>same.
>
>>
>> Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxx>
>
>But with those fixed, looks good to me. Adding Josh (and others) to CC
>since he originally added the linkage to EXPERT in commit
>f505c553dbe2.

CONFIG_DEBUG_KERNEL shouldn't affect code generation in any way; it should only make more options appear in kconfig. I originally added this to ensure that features you might want to *disable* aren't hidden, as part of the tinification effort.

What specific problem does having CONFIG_DEBUG_KERNEL enabled cause for you? I'd still prefer to have a single switch for "don't hide things I might want to disable", rather than several.

This would also need checking to make sure it doesn't grow tinyconfig.