Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released

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To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Thu, 13 Jun 2024 19:55:45 +0100
Cc: Mateusz Guzik <mjguzik@xxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, jack@xxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
In-reply-to: <CAHk-=wi4xCJKiCRzmDDpva+VhsrBuZfawGFb9vY6QXV2-_bELw@mail.gmail.com>

On Thu, Jun 13, 2024 at 11:43:05AM -0700, Linus Torvalds wrote:

>        seqcount_spinlock_t        d_seq;
> 
> because seqcount_spinlock_t has been entirely broken and went from
> being 4 bytes back when, to now being 64 bytes.

1ca7d67cf5d5 "seqcount: Add lockdep functionality to seqcount/seqlock structures"

References:
- [PATCH 0/2] stop lockref from degrading to locked-only ops
  - From: Mateusz Guzik
- [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
  - From: Mateusz Guzik
- Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
  - From: Linus Torvalds
- Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
  - From: Linus Torvalds
- Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
  - From: Mateusz Guzik
- Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
  - From: Christian Brauner
- Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
  - From: Linus Torvalds
- Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
  - From: Mateusz Guzik
- Re: [PATCH 1/2] lockref: speculatively spin waiting for the lock to be released
  - From: Linus Torvalds

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