Messages in this thread Patch in this message | | | Date | Mon, 10 Feb 2014 10:41:36 +0000 | From | Catalin Marinas <> | Subject | Re: [PATCH] ARM: mm: report both sections from PMD |
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On Mon, Feb 10, 2014 at 10:29:35AM +0000, Catalin Marinas wrote: > On Sun, Feb 09, 2014 at 10:18:26PM +0000, Kees Cook wrote: > > diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c > > index 1f7b1e13d945..ff1559f9200c 100644 > > --- a/arch/arm/mm/dump.c > > +++ b/arch/arm/mm/dump.c > > @@ -264,6 +264,9 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start) > > note_page(st, addr, 3, pmd_val(*pmd)); > > else > > walk_pte(st, pmd, addr); > > + > > + if (SECTION_SIZE < PMD_SIZE && pmd_sect(*pmd)) > > + note_page(st, addr + SECTION_SIZE, 3, pmd_val(pmd[1])); > > You can use pmd_large() here as well. > > But I think this function is broken (the "for" statement not shown > here). The pmd_t is 32-bit with classic MMU and it uses pmd++ while the > address grows by PMD_SIZE (two pmd_t entries).
Actually it's ok since PTRS_PER_PMD is 1, so it only goes through this loop once.
But in your patch shouldn't you check for pmd_large(*(pmd+1))? The first pmd is already caught by the 'if' statement.
-- Catalin
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