On Monday, March 22, 2021 3:43:41 AM EDT you wrote:
> Hi Julian,
>
> On Sun, Mar 21, 2021 at 11:40 PM Julian Braha <julianbr...@gmail.com> wrote:
> > On Sunday, March 21, 2021 2:28:43 PM EDT you wrote:
> > > On Sat, Mar 20, 2021 at 1:17 AM Julian Braha <julianbr...@gmail.com>
> > > wrote:
> > > > When LATENCYTOP is enabled and ARCH_WANT_FRAME_POINTERS
> > > > is disabled, Kbuild gives the following warning:
> > > >
> > > > WARNING: unmet direct dependencies detected for FRAME_POINTER
> > > > Depends on [n]: DEBUG_KERNEL [=y] && (M68K || UML || SUPERH) ||
> > > > ARCH_WANT_FRAME_POINTERS [=n] || MCOUNT [=n]
> > > > Selected by [y]:
> > > > - LATENCYTOP [=y] && DEBUG_KERNEL [=y] && STACKTRACE_SUPPORT [=y] &&
> > > > PROC_FS [=y] && !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC
> > > > && !X86
> > > >
> > > > This is because LATENCYTOP selects FRAME_POINTER,
> > > > without selecting or depending on ARCH_WANT_FRAME_POINTERS,
> > > > despite FRAME_POINTER depending on ARCH_WANT_FRAME_POINTERS.
> > > >
> > > > Signed-off-by: Julian Braha <julianbr...@gmail.com>
> > >
> > > Thanks for your patch!
> > >
> > > > --- a/lib/Kconfig.debug
> > > > +++ b/lib/Kconfig.debug
> > > > @@ -1675,6 +1675,7 @@ config LATENCYTOP
> > > > depends on DEBUG_KERNEL
> > > > depends on STACKTRACE_SUPPORT
> > > > depends on PROC_FS
> > > > + select ARCH_WANT_FRAME_POINTERS if !MIPS && !PPC && !S390 &&
> > > > !MICROBLAZE && !ARM && !ARC && !X86
> > >
> > > ARCH_WANT_FRAME_POINTERS is a symbol that is only to be selected by
> > > architecture-specific configuration, and must not be overridden:
> > >
> > > # Select this config option from the architecture Kconfig, if it
> > > # is preferred to always offer frame pointers as a config
> > > # option on the architecture (regardless of KERNEL_DEBUG):
> > >
> > > Probably this should be turned into a depends instead?
> > >
> > > > select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE
> > > > && !ARM && !ARC && !X86
> > > > select KALLSYMS
> > > > select KALLSYMS_ALL
>
> > Making this a 'depends' causes a recursive dependency error.
> > Any other ideas?
>
> What about
>
> -select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE &&
> !ARM && !ARC && !X86
> +depends on FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE
> && !ARM && !ARC && !X86
>
> ?
>
> Gr{oetje,eeting}s,
>
> Geert
>
>
Hi Geert,
Sadly, this won't work either. In Kconfig, 'depends' cannot have an 'if' after
it (only 'select' can.)
Kbuild gives an error for this.
- Julian Braha
