On Wed, Aug 21, 2019 at 07:01:59PM +0300, Mike Rapoport wrote:
> On Wed, Aug 21, 2019 at 04:49:42PM +0100, Will Deacon wrote:
> > On Wed, Aug 21, 2019 at 06:06:58PM +0300, Mike Rapoport wrote:
> > > diff --git a/init/main.c b/init/main.c
> > > index b90cb5f..2fa8038 100644
> > > --- a/init/main.c
> > > +++ b/init/main.c
> > > @@ -507,7 +507,7 @@ void __init __weak mem_encrypt_init(void) { }
> > >
> > > void __init __weak poking_init(void) { }
> > >
> > > -void __init __weak pgd_cache_init(void) { }
> > > +void __init __weak pgtable_cache_init(void) { }
> > >
> > > bool initcall_debug;
> > > core_param(initcall_debug, initcall_debug, bool, 0644);
> > > @@ -565,7 +565,6 @@ static void __init mm_init(void)
> > > init_espfix_bsp();
> > > /* Should be run after espfix64 is set up. */
> > > pti_init();
> > > - pgd_cache_init();
> > > }
> >
> > AFAICT, this change means we now initialise our pgd cache before
> > debug_objects_mem_init() has run.
>
> Right.
>
> > Is that going to cause fireworks with CONFIG_DEBUG_OBJECTS when we later
> > free a pgd?
>
> We don't allocate a pgd at that time, we only create the kmem cache for the
> future allocations. And that cache is never destroyed anyway.
Thanks for the explanation. In which case, for arm64:
Acked-by: Will Deacon <will@xxxxxxxxxx>
Will
