From: "Ahmed S. Darwish" <a.darwish@linutronix.de>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Peter Xu <peterx@redhat.com>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Christoph Hellwig <hch@lst.de>, Hugh Dickins <hughd@google.com>,
Jan Kara <jack@suse.cz>, Jann Horn <jannh@google.com>,
John Hubbard <jhubbard@nvidia.com>,
Kirill Shutemov <kirill@shutemov.name>,
Kirill Tkhai <ktkhai@virtuozzo.com>,
Leon Romanovsky <leonro@nvidia.com>,
Linux-MM <linux-mm@kvack.org>, Michal Hocko <mhocko@suse.com>,
Oleg Nesterov <oleg@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Sebastian Siewior <bigeasy@linutronix.de>
Subject: Re: [PATCH v2 2/2] mm: prevent gup_fast from racing with COW during fork
Date: Tue, 3 Nov 2020 01:41:33 +0100 [thread overview]
Message-ID: <20201103004133.GD52235@lx-t490> (raw)
In-Reply-To: <20201103002532.GL2620339@nvidia.com>
On Mon, Nov 02, 2020 at 08:25:32PM -0400, Jason Gunthorpe wrote:
> On Tue, Nov 03, 2020 at 01:17:12AM +0100, Ahmed S. Darwish wrote:
>
> > Please stick with the official exported API: raw_write_seqcount_begin().
>
> How did you know this was 'offical exported API' ??
>
All the official exported seqlock.h APIs are marked with verbose
kernel-doc annotations on top. The rest are internal...
> > Exactly. '*_seqcount_t_*' is a seqlock.h implementation detail, and it
> > has _zero_ relevance to what is discussed in this thread actually.
>
> Add some leading __'s to them?
>
It's a bit more complicated than just adding some "__" prefixes, due to
the massive compile-time polymorphism done through _Generic().
The '*_seqcount_t_*' format was the best we could come up with to
distinguish (again, for internal seqlock.h code) between macros taking
all seqcount_LOCKNAME_t types, and macros/functions taking only plain
seqcount_t.
Thanks,
--
Ahmed S. Darwish
Linutronix GmbH
next prev parent reply other threads:[~2020-11-03 0:41 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-30 14:46 [PATCH v2 0/2] Add a seqcount between gup_fast and copy_page_range() Jason Gunthorpe
2020-10-30 14:46 ` [PATCH v2 1/2] mm: reorganize internal_get_user_pages_fast() Jason Gunthorpe
2020-10-30 16:29 ` Jan Kara
2020-10-30 21:31 ` John Hubbard
2020-10-30 22:36 ` Peter Xu
2020-10-30 14:46 ` [PATCH v2 2/2] mm: prevent gup_fast from racing with COW during fork Jason Gunthorpe
2020-10-30 16:51 ` Jan Kara
2020-10-30 17:02 ` Jason Gunthorpe
2020-11-02 8:31 ` Jan Kara
2020-10-30 21:20 ` John Hubbard
2020-10-30 22:52 ` Peter Xu
2020-10-30 23:51 ` Jason Gunthorpe
2020-10-31 15:26 ` Peter Xu
2020-11-03 0:33 ` Ahmed S. Darwish
2020-11-03 0:17 ` Ahmed S. Darwish
2020-11-03 0:25 ` Jason Gunthorpe
2020-11-03 0:41 ` Ahmed S. Darwish [this message]
2020-11-03 2:20 ` John Hubbard
2020-11-03 6:52 ` Ahmed S. Darwish
2020-11-03 7:05 ` John Hubbard
2020-11-03 17:40 ` Linus Torvalds
2020-11-03 17:40 ` Linus Torvalds
2020-11-04 1:32 ` Ahmed S. Darwish
2020-11-04 2:01 ` John Hubbard
2020-11-04 3:17 ` Ahmed S. Darwish
2020-11-04 18:38 ` Linus Torvalds
2020-11-04 18:38 ` Linus Torvalds
2020-11-04 19:54 ` Ahmed S. Darwish
2020-12-09 18:38 ` [tip: locking/core] seqlock: Prefix internal seqcount_t-only macros with a "do_" tip-bot2 for Ahmed S. Darwish
2020-12-09 18:38 ` [tip: locking/core] seqlock: kernel-doc: Specify when preemption is automatically altered tip-bot2 for Ahmed S. Darwish
2020-11-10 11:53 ` [PATCH v2 2/2] mm: prevent gup_fast from racing with COW during fork Peter Zijlstra
2020-12-03 10:35 ` [tip: locking/core] seqlock: Rename __seqprop() users tip-bot2 for Peter Zijlstra
2020-11-03 17:03 ` [PATCH v2 2/2] mm: prevent gup_fast from racing with COW during fork Peter Xu
2020-11-02 23:58 ` Ahmed S. Darwish
2020-11-02 22:19 ` [PATCH v2 0/2] Add a seqcount between gup_fast and copy_page_range() Ahmed S. Darwish
2020-11-02 22:39 ` Linus Torvalds
2020-11-02 22:39 ` Linus Torvalds
2020-11-02 23:18 ` Ahmed S. Darwish
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