Re: [PATCH 21/23] x86: Allow get_locked_pte() to fail

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To: Hugh Dickins <hughd@xxxxxxxxxx>
Subject: Re: [PATCH 21/23] x86: Allow get_locked_pte() to fail
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu, 11 May 2023 09:29:21 +0200
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Mike Kravetz <mike.kravetz@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>, Greg Ungerer <gerg@xxxxxxxxxxxxxx>, Michal Simek <monstr@xxxxxxxxx>, Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, John David Anglin <dave.anglin@xxxxxxxx>, "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>, Palmer Dabbelt <palmer@xxxxxxxxxxx>, Heiko Carstens <hca@xxxxxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>, Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>, John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Chris Zankel <chris@xxxxxxxxxx>, Max Filippov <jcmvbkbc@xxxxxxxxx>, x86@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-m68k@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <e5554cd1-417a-aa6a-5e5e-f4f5f773dda@google.com>
References: <77a5d8c-406b-7068-4f17-23b7ac53bc83@google.com> <eba2b72f-2180-498b-c8bd-ce8f717fc78a@google.com> <20230510081848.GD83892@hirez.programming.kicks-ass.net> <e5554cd1-417a-aa6a-5e5e-f4f5f773dda@google.com>

On Wed, May 10, 2023 at 08:16:34PM -0700, Hugh Dickins wrote:
> Thanks for looking so quickly, Peter: I didn't Cc you on this particular
> series, but shall certainly be doing so on the ones that follow, because
> a few of those patches go into interesting pmdp_get_lockless() territory.

I'm in the x86@ catch-all, which is how I saw this as quickly :-) A
direct copy won't hurt ofc, the mail system will sort it out.

References:
- [PATCH 00/23] arch: allow pte_offset_map[_lock]() to fail
  - From: Hugh Dickins
- [PATCH 21/23] x86: Allow get_locked_pte() to fail
  - From: Hugh Dickins
- Re: [PATCH 21/23] x86: Allow get_locked_pte() to fail
  - From: Peter Zijlstra
- Re: [PATCH 21/23] x86: Allow get_locked_pte() to fail
  - From: Hugh Dickins

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