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

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Date:   Wed, 26 Jul 2023 14:12:35 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.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 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.

							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*\(\s*(\!\s*|NULL\s*==\s*)?($Lval)(\s*==\s*NULL\s*)?\s*\)/ &&