linux-kernel - Re: [PATCH 5/5] Revert "checkpatch: Error out if deprecated RCU API used"

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Date:   Wed, 26 Jul 2023 22:55:24 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     paulmck@...nel.org
Cc:     linux-kernel@...r.kernel.org, Andy Whitcroft <apw@...onical.com>,
        Joe Perches <joe@...ches.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>, rcu@...r.kernel.org
Subject: Re: [PATCH 5/5] Revert "checkpatch: Error out if deprecated RCU API used"

On Wed, Jul 26, 2023 at 5:12 PM Paul E. McKenney <paulmck@...nel.org> wrote:
>
> On Tue, Jul 25, 2023 at 11:29:10PM +0000, Joel Fernandes (Google) wrote:
> > The check for single-argument kfree_rcu() is no longer needed as all
> > users have been converted.
> >
> > This reverts commit 1eacac3255495be7502d406e2ba5444fb5c3607c.
> >
> > Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
>
> Good eyes, thank you!
>
> I applied this with an updated commit log as shown below.  Please let
> me know if I messed something up.

LGTM. Thank you!

 - Joel


>
>                                                         Thanx, Paul
>
> ------------------------------------------------------------------------
>
> commit 1f5f0053f7662385d9ead46d4c0d2d4fe9aaa73a
> Author: Joel Fernandes (Google) <joel@...lfernandes.org>
> Date:   Tue Jul 25 23:29:10 2023 +0000
>
>     Revert "checkpatch: Error out if deprecated RCU API used"
>
>     The definition for single-argument kfree_rcu() has been removed,
>     so that any further attempt to use it will result in a build error.
>     Because of this build error, there is no longer any need for a special
>     check in checkpatch.pl.
>
>     Therefore, revert commit 1eacac3255495be7502d406e2ba5444fb5c3607c.
>
>     Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
>     Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index a9841148cde2..528f619520eb 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -6422,15 +6422,6 @@ sub process {
>                         }
>                 }
>
> -# check for soon-to-be-deprecated single-argument k[v]free_rcu() API
> -               if ($line =~ /\bk[v]?free_rcu\s*\([^(]+\)/) {
> -                       if ($line =~ /\bk[v]?free_rcu\s*\([^,]+\)/) {
> -                               ERROR("DEPRECATED_API",
> -                                     "Single-argument k[v]free_rcu() API is deprecated, please pass rcu_head object or call k[v]free_rcu_mightsleep()." . $herecurr);
> -                       }
> -               }
> -
> -
>  # check for unnecessary "Out of Memory" messages
>                 if ($line =~ /^\+.*\b$logFunctions\s*\(/ &&
>                     $prevline =~ /^[ \+]\s*if\s*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ &&