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From: "Kirill A. Shutemov" <kirill@shutemov.name>
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>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"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.deacon@arm.com>,
	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>
Subject: Re: [PATCH v2 03/13] mm: Add generic p?d_large() macros
Date: Thu, 21 Feb 2019 17:28:12 +0300	[thread overview]
Message-ID: <20190221142812.oa53lfnnfmsuh6ys@kshutemo-mobl1> (raw)
In-Reply-To: <20190221113502.54153-4-steven.price@arm.com>

On Thu, Feb 21, 2019 at 11:34:52AM +0000, Steven Price wrote:
> From: James Morse <james.morse@arm.com>
> 
> Exposing the pud/pgd levels of the page tables to walk_page_range() means
> we may come across the exotic large mappings that come with large areas
> of contiguous memory (such as the kernel's linear map).
> 
> For architectures that don't provide p?d_large() macros, provided a
> does nothing default.

Nak, sorry.

Power will get broken by the patch. It has pmd_large() inline function,
that will be overwritten by the define from this patch.

I believe it requires more ground work on arch side in general.
All architectures that has huge page support has to provide these helpers
(and matching defines) before you can use it in a generic code.

-- 
 Kirill A. Shutemov

  parent reply	other threads:[~2019-02-21 14:28 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-21 11:34 [PATCH v2 00/13] Convert x86 & arm64 to use generic page walk Steven Price
2019-02-21 11:34 ` [PATCH v2 01/13] arm64: mm: Add p?d_large() definitions Steven Price
2019-02-21 13:52   ` Mark Rutland
2019-02-21 11:34 ` [PATCH v2 02/13] x86/mm: " Steven Price
2019-02-21 14:21   ` Kirill A. Shutemov
2019-02-21 11:34 ` [PATCH v2 03/13] mm: Add generic p?d_large() macros Steven Price
2019-02-21 13:41   ` Mark Rutland
2019-02-21 14:28   ` Kirill A. Shutemov [this message]
2019-02-21 14:46     ` Steven Price
2019-02-21 14:57       ` Kirill A. Shutemov
2019-02-21 17:16         ` Steven Price
2019-02-21 21:06           ` Kirill A. Shutemov
2019-02-22 10:21             ` Steven Price
2019-03-01 11:53             ` Mike Rapoport
2019-03-01 12:30               ` Kirill A. Shutemov
2019-03-01 13:39                 ` Steven Price
2019-03-03  7:12                   ` Mike Rapoport
2019-03-04 14:35                     ` Steven Price
2019-03-04 14:53                       ` Mike Rapoport
2019-03-01 11:49         ` Mike Rapoport
2019-03-01 12:28           ` Kirill A. Shutemov
2019-02-21 11:34 ` [PATCH v2 04/13] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-02-21 11:34 ` [PATCH v2 05/13] mm: pagewalk: Allow walking without vma Steven Price
2019-02-21 11:34 ` [PATCH v2 06/13] mm: pagewalk: Add 'depth' parameter to pte_hole Steven Price
2019-02-21 11:34 ` [PATCH v2 07/13] mm: pagewalk: Add test_p?d callbacks Steven Price
2019-02-21 11:34 ` [PATCH v2 08/13] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2019-02-21 11:34 ` [PATCH v2 09/13] x86/mm: Point to struct seq_file from struct pg_state Steven Price
2019-02-21 11:34 ` [PATCH v2 10/13] x86/mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-02-21 11:35 ` [PATCH v2 11/13] x86/mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct Steven Price
2019-02-21 11:35 ` [PATCH v2 12/13] x86/mm: Convert ptdump_walk_pgd_level_core() " Steven Price
2019-02-21 11:35 ` [PATCH v2 13/13] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price

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