linux-kernel - Re: [PATCH] vfs: dodge smp_mb in break_lease and break

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Message-ID: <20240807-antworten-magie-4bc046eb5137@brauner>
Date: Wed,  7 Aug 2024 11:22:02 +0200
From: Christian Brauner <brauner@...nel.org>
To: Mateusz Guzik <mjguzik@...il.com>
Cc: Christian Brauner <brauner@...nel.org>,
	jack@...e.cz,
	jlayton@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH] vfs: dodge smp_mb in break_lease and break_deleg in the common case

On Tue, 06 Aug 2024 19:28:46 +0200, Mateusz Guzik wrote:
> These inlines show up in the fast path (e.g., in do_dentry_open()) and
> induce said full barrier regarding i_flctx access when in most cases the
> pointer is NULL.
> 
> The pointer can be safely checked before issuing the barrier, dodging it
> in most cases as a result.
> 
> [...]

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/1] vfs: dodge smp_mb in break_lease and break_deleg in the common case
      https://git.kernel.org/vfs/vfs/c/e23ee5db10d3