Re: (BTF) [PATCH] mm/page_alloc: Work around a pahole limitation with zero-sized struct pagesets

[Mel Gorman]

On Wed, May 26, 2021 at 10:33:42AM +0200, Michal Such?nek wrote:
> >  lib/Kconfig.debug |  3 +++
> >  mm/page_alloc.c   | 11 +++++++++++
> >  2 files changed, 14 insertions(+)
> > 
> > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> > index 678c13967580..f88a155b80a9 100644
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
> > @@ -313,6 +313,9 @@ config DEBUG_INFO_BTF
> >  config PAHOLE_HAS_SPLIT_BTF
> >  	def_bool $(success, test `$(PAHOLE) --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/'` -ge "119")
> >  
> > +config PAHOLE_HAS_ZEROSIZE_PERCPU_SUPPORT
> > +	def_bool $(success, test `$(PAHOLE) --version | sed -E 's/v([0-9]+)\.([0-9]+)/\1\2/'` -ge "122")
> > +
> 
> This does not seem workable with dummy-tools.
> 
> Do we even have dummy pahole?
> 

I don't think so but if PAHOLE_HAS_ZEROSIZE_PERCPU_SUPPORT is broken for
you then the same problem should have happened for the PAHOLE_HAS_SPLIT_BTF
check.

-- 
Mel Gorman
SUSE Labs