From: Catalin Marinas <catalin.marinas@arm.com>
To: Steven Price <steven.price@arm.com>
Cc: linux-mm@kvack.org, "Andy Lutomirski" <luto@kernel.org>,
"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
"Arnd Bergmann" <arnd@arndb.de>, "Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Ingo Molnar" <mingo@redhat.com>,
"James Morse" <james.morse@arm.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Will Deacon" <will@kernel.org>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
"Mark Rutland" <Mark.Rutland@arm.com>,
"Liang, Kan" <kan.liang@linux.intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>
Subject: Re: [PATCH v14 04/22] arm64: mm: Add p?d_leaf() definitions
Date: Wed, 30 Oct 2019 15:31:30 +0000 [thread overview]
Message-ID: <20191030153130.GB13309@arrakis.emea.arm.com> (raw)
In-Reply-To: <20191028135910.33253-5-steven.price@arm.com>
On Mon, Oct 28, 2019 at 01:58:52PM +0000, Steven Price wrote:
> walk_page_range() is going to be allowed to walk page tables other than
> those of user space. For this it needs to know when it has reached a
> 'leaf' entry in the page tables. This information will be provided by the
> p?d_leaf() functions/macros.
>
> For arm64, we already have p?d_sect() macros which we can reuse for
> p?d_leaf().
>
> pud_sect() is defined as a dummy function when CONFIG_PGTABLE_LEVELS < 3
> or CONFIG_ARM64_64K_PAGES is defined. However when the kernel is
> configured this way then architecturally it isn't allowed to have a
> large page at this level, and any code using these page walking macros
> is implicitly relying on the page size/number of levels being the same as
> the kernel. So it is safe to reuse this for p?d_leaf() as it is an
> architectural restriction.
>
> CC: Catalin Marinas <catalin.marinas@arm.com>
> CC: Will Deacon <will@kernel.org>
> Signed-off-by: Steven Price <steven.price@arm.com>
I can see akpm picked these patches already. FWIW:
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2019-10-30 15:31 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-28 13:58 [PATCH v14 00/22] Generic page walk and ptdump Steven Price
2019-10-28 13:58 ` [PATCH v14 01/22] mm: Add generic p?d_leaf() macros Steven Price
2019-10-28 13:58 ` [PATCH v14 02/22] arc: mm: Add p?d_leaf() definitions Steven Price
2019-10-28 13:58 ` [PATCH v14 03/22] arm: " Steven Price
2019-10-28 13:58 ` [PATCH v14 04/22] arm64: " Steven Price
2019-10-30 15:31 ` Catalin Marinas [this message]
2019-10-28 13:58 ` [PATCH v14 05/22] mips: " Steven Price
2019-10-28 13:58 ` [PATCH v14 06/22] powerpc: " Steven Price
2019-10-28 13:58 ` [PATCH v14 07/22] riscv: " Steven Price
2019-10-28 13:58 ` [PATCH v14 08/22] s390: " Steven Price
2019-10-28 13:58 ` [PATCH v14 09/22] sparc: " Steven Price
2019-10-28 13:58 ` [PATCH v14 10/22] x86: " Steven Price
2019-10-28 13:58 ` [PATCH v14 11/22] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-10-28 13:59 ` [PATCH v14 12/22] mm: pagewalk: Allow walking without vma Steven Price
2019-10-31 15:15 ` [mm] 9343f6818b: BUG:kernel_NULL_pointer_dereference,address kernel test robot
2019-10-31 17:22 ` Steven Price
2019-10-28 13:59 ` [PATCH v14 13/22] mm: pagewalk: Add test_p?d callbacks Steven Price
2019-10-28 13:59 ` [PATCH v14 14/22] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price
2019-10-28 13:59 ` [PATCH v14 15/22] x86: mm: Point to struct seq_file from struct pg_state Steven Price
2019-10-28 13:59 ` [PATCH v14 16/22] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-10-28 13:59 ` [PATCH v14 17/22] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price
2019-10-28 13:59 ` [PATCH v14 18/22] x86: mm: Convert ptdump_walk_pgd_level_core() " Steven Price
2019-10-28 13:59 ` [PATCH v14 19/22] mm: Add generic ptdump Steven Price
2019-10-30 16:48 ` Catalin Marinas
2019-10-28 13:59 ` [PATCH v14 20/22] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price
2019-10-28 13:59 ` [PATCH v14 21/22] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2019-10-30 16:45 ` Catalin Marinas
2019-10-31 13:32 ` Steven Price
2019-10-31 13:33 ` [PATCH] mm: ptdump: Reduce level numbers by 1 in note_page() Steven Price
2019-10-31 14:36 ` Catalin Marinas
2019-10-31 14:00 ` [PATCH v14 21/22] arm64: mm: Convert mm/dump.c to use walk_page_range() Catalin Marinas
2019-10-31 14:37 ` Catalin Marinas
2019-10-28 13:59 ` [PATCH v14 22/22] arm64: mm: Display non-present entries in ptdump Steven Price
2019-10-30 16:50 ` Catalin Marinas
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