From: kirill@shutemov.name (Kirill A. Shutemov)
To: linux-snps-arc@lists.infradead.org
Subject: [PATCH V4 2/2] mm/pgtable/debug: Add test validating architecture page table helpers
Date: Mon, 7 Oct 2019 16:26:07 +0300 [thread overview]
Message-ID: <20191007132607.4q537nauwfn5thol@box> (raw)
In-Reply-To: <20191007130617.GB56546@gmail.com>
On Mon, Oct 07, 2019@03:06:17PM +0200, Ingo Molnar wrote:
>
> * Anshuman Khandual <anshuman.khandual@arm.com> wrote:
>
> > This adds a test module which will validate architecture page table helpers
> > and accessors regarding compliance with generic MM semantics expectations.
> > This will help various architectures in validating changes to the existing
> > page table helpers or addition of new ones.
> >
> > Test page table and memory pages creating it's entries at various level are
> > all allocated from system memory with required alignments. If memory pages
> > with required size and alignment could not be allocated, then all depending
> > individual tests are skipped.
>
> > diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
> > index 52e5f5f2240d..b882792a3999 100644
> > --- a/arch/x86/include/asm/pgtable_64_types.h
> > +++ b/arch/x86/include/asm/pgtable_64_types.h
> > @@ -40,6 +40,8 @@ static inline bool pgtable_l5_enabled(void)
> > #define pgtable_l5_enabled() 0
> > #endif /* CONFIG_X86_5LEVEL */
> >
> > +#define mm_p4d_folded(mm) (!pgtable_l5_enabled())
> > +
> > extern unsigned int pgdir_shift;
> > extern unsigned int ptrs_per_p4d;
>
> Any deep reason this has to be a macro instead of proper C?
It's a way to override the generic mm_p4d_folded(). It can be rewritten
as inline function + define. Something like:
#define mm_p4d_folded mm_p4d_folded
static inline bool mm_p4d_folded(struct mm_struct *mm)
{
return !pgtable_l5_enabled();
}
But I don't see much reason to be more verbose here than needed.
--
Kirill A. Shutemov
next prev parent reply other threads:[~2019-10-07 13:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-07 5:45 [PATCH V4 0/2] mm/debug: Add tests for architecture exported page table helpers Anshuman Khandual
2019-10-07 5:45 ` [PATCH V4 1/2] mm/hugetlb: Make alloc_gigantic_page() available for general use Anshuman Khandual
2019-10-07 5:45 ` [PATCH V4 2/2] mm/pgtable/debug: Add test validating architecture page table helpers Anshuman Khandual
2019-10-07 13:06 ` Ingo Molnar
2019-10-07 13:26 ` Kirill A. Shutemov [this message]
2019-10-07 13:51 ` Ingo Molnar
2019-10-07 14:00 ` Kirill A. Shutemov
2019-10-08 8:13 ` Anshuman Khandual
2019-10-08 8:07 ` Anshuman Khandual
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