Messages in this thread Patch in this message |  | | Date | Fri, 14 Feb 2014 10:15:30 +0000 | From | Catalin Marinas <> | Subject | Re: [PATCH v2] ARM: mm: report both sections from PMD |
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On Thu, Feb 13, 2014 at 07:52:03PM +0000, Kees Cook wrote: > On Thu, Feb 13, 2014 at 9:12 AM, Catalin Marinas > <catalin.marinas@arm.com> wrote: > > On Wed, Feb 12, 2014 at 10:46:38PM +0000, Kees Cook wrote: > >> diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h > >> index 03243f7eeddf..fb3de59ee811 100644 > >> --- a/arch/arm/include/asm/pgtable-3level.h > >> +++ b/arch/arm/include/asm/pgtable-3level.h > >> @@ -138,10 +138,6 @@ > >> #define pud_none(pud) (!pud_val(pud)) > >> #define pud_bad(pud) (!(pud_val(pud) & 2)) > >> #define pud_present(pud) (pud_val(pud)) > >> -#define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ > >> - PMD_TYPE_TABLE) > >> -#define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ > >> - PMD_TYPE_SECT) > >> #define pmd_large(pmd) pmd_sect(pmd) > >> > >> #define pud_clear(pudp) \ > >> diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h > >> index 7d59b524f2af..934aa5b60c7c 100644 > >> --- a/arch/arm/include/asm/pgtable.h > >> +++ b/arch/arm/include/asm/pgtable.h > >> @@ -183,6 +183,10 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; > >> > >> #define pmd_none(pmd) (!pmd_val(pmd)) > >> #define pmd_present(pmd) (pmd_val(pmd)) > >> +#define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ > >> + PMD_TYPE_TABLE) > >> +#define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ > >> + PMD_TYPE_SECT) > > > > Do you still need to move these two if you only use pmd_large()? AFAICT, > > it is equivalent to pmd_sect(). > > Why does pmd_sect exist? I can reduce it to just using pmd_large.
pmd_sect/pmd_table were there first and used by kvm. The pmd_large() was added by Russell because the dump.c code was derived from x86 which uses such macro. And we have another close relative, pmd_huge(), though only defined if CONFIG_HUGETLB_PAGE.
We could drop pmd_large() in favour of pmd_sect() but it's up to Russell. OTOH, when someone will try to add arm64 support, I'll most likely ask for part of the x86 code to be turned into a generic library and we'll need some common naming for such macros (e.g. pmd_large()).
-- Catalin
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