From: Catalin Marinas <catalin.marinas@arm.com> To: Kees Cook <keescook@chromium.org> Cc: Russell King <linux@arm.linux.org.uk>, Will Deacon <Will.Deacon@arm.com>, Steven Capper <steve.capper@linaro.org>, Christoffer Dall <christoffer.dall@linaro.org>, Marc Zyngier <Marc.Zyngier@arm.com>, Laura Abbott <lauraa@codeaurora.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCH v2] ARM: mm: report both sections from PMD Date: Thu, 13 Feb 2014 17:12:11 +0000 [thread overview] Message-ID: <20140213171211.GJ19841@arm.com> (raw) In-Reply-To: <20140212224638.GA4558@www.outflux.net> 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(). > static inline pte_t *pmd_page_vaddr(pmd_t pmd) > { > diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c > index 2b342177f5de..32635b474832 100644 > --- a/arch/arm/mm/dump.c > +++ b/arch/arm/mm/dump.c > @@ -260,8 +260,14 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start) > > for (i = 0; i < PTRS_PER_PMD; i++, pmd++) { > addr = start + i * PMD_SIZE; > - if (pmd_none(*pmd) || pmd_large(*pmd) || !pmd_present(*pmd)) > + if (pmd_none(*pmd) || pmd_large(*pmd) || !pmd_present(*pmd)) { > note_page(st, addr, 3, pmd_val(*pmd)); > + if (SECTION_SIZE < PMD_SIZE && > + pmd_sect(*pmd) && pmd_sect(pmd[1])) { I think the first patch was better with pmd[0] and pmd[1] treated independently if SECTION_SIZE < PMD_SIZE, only that it should have checked for pmd_sect(pmd[1]). I don't see anything in __map_init_section() that would prevent populating only the second pmd leaving the first one empty. -- Catalin
WARNING: multiple messages have this Message-ID (diff)
From: catalin.marinas@arm.com (Catalin Marinas) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2] ARM: mm: report both sections from PMD Date: Thu, 13 Feb 2014 17:12:11 +0000 [thread overview] Message-ID: <20140213171211.GJ19841@arm.com> (raw) In-Reply-To: <20140212224638.GA4558@www.outflux.net> 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(). > static inline pte_t *pmd_page_vaddr(pmd_t pmd) > { > diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c > index 2b342177f5de..32635b474832 100644 > --- a/arch/arm/mm/dump.c > +++ b/arch/arm/mm/dump.c > @@ -260,8 +260,14 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start) > > for (i = 0; i < PTRS_PER_PMD; i++, pmd++) { > addr = start + i * PMD_SIZE; > - if (pmd_none(*pmd) || pmd_large(*pmd) || !pmd_present(*pmd)) > + if (pmd_none(*pmd) || pmd_large(*pmd) || !pmd_present(*pmd)) { > note_page(st, addr, 3, pmd_val(*pmd)); > + if (SECTION_SIZE < PMD_SIZE && > + pmd_sect(*pmd) && pmd_sect(pmd[1])) { I think the first patch was better with pmd[0] and pmd[1] treated independently if SECTION_SIZE < PMD_SIZE, only that it should have checked for pmd_sect(pmd[1]). I don't see anything in __map_init_section() that would prevent populating only the second pmd leaving the first one empty. -- Catalin
next prev parent reply other threads:[~2014-02-13 17:12 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-02-12 22:46 [PATCH v2] ARM: mm: report both sections from PMD Kees Cook 2014-02-12 22:46 ` Kees Cook 2014-02-13 17:12 ` Catalin Marinas [this message] 2014-02-13 17:12 ` Catalin Marinas 2014-02-13 19:52 ` Kees Cook 2014-02-13 19:52 ` Kees Cook 2014-02-14 10:15 ` Catalin Marinas 2014-02-14 10:15 ` Catalin Marinas
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20140213171211.GJ19841@arm.com \ --to=catalin.marinas@arm.com \ --cc=Marc.Zyngier@arm.com \ --cc=Will.Deacon@arm.com \ --cc=christoffer.dall@linaro.org \ --cc=keescook@chromium.org \ --cc=lauraa@codeaurora.org \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux@arm.linux.org.uk \ --cc=steve.capper@linaro.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.