linux-kernel - Re: [PATCH 00/13] Rename k[v]free_rcu() single argument to k[v]free_rcu

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Date:   Thu, 23 Feb 2023 07:54:15 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
        Jens Axboe <axboe@...nel.dk>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Bryan Tan <bryantan@...are.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Bob Pearson <rpearsonhpe@...il.com>,
        Ariel Levkovich <lariel@...dia.com>,
        Theodore Ts'o <tytso@....edu>, Julian Anastasov <ja@....bg>,
        pablo@...filter.org
Subject: Re: [PATCH 00/13] Rename k[v]free_rcu() single argument to
 k[v]free_rcu_mightsleep()

On Thu, Feb 23, 2023 at 02:29:42PM +0000, Zhuo, Qiuxu wrote:
> > From: Frederic Weisbecker <frederic@...nel.org>
> > Sent: Thursday, February 23, 2023 8:45 PM
> > To: Uladzislau Rezki (Sony) <urezki@...il.com>
> > Cc: LKML <linux-kernel@...r.kernel.org>; RCU <rcu@...r.kernel.org>; Paul
> > E . McKenney <paulmck@...nel.org>; Oleksiy Avramchenko
> > <oleksiy.avramchenko@...y.com>; Jens Axboe <axboe@...nel.dk>; Philipp
> > Reisner <philipp.reisner@...bit.com>; Bryan Tan <bryantan@...are.com>;
> > Steven Rostedt <rostedt@...dmis.org>; Eric Dumazet
> > <edumazet@...gle.com>; Bob Pearson <rpearsonhpe@...il.com>; Ariel
> > Levkovich <lariel@...dia.com>; Theodore Ts'o <tytso@....edu>; Julian
> > Anastasov <ja@....bg>
> > Subject: Re: [PATCH 00/13] Rename k[v]free_rcu() single argument to
> > k[v]free_rcu_mightsleep()
> > 
> > On Wed, Feb 01, 2023 at 04:08:06PM +0100, Uladzislau Rezki (Sony) wrote:
> > > This small series is based on Paul's "dev" branch. Head is
> > > 6002817348a1c610dc1b1c01ff81654cdec12be4
> > > it renames a single argument of k[v]free_rcu() to its new
> > k[v]free_rcu_mightsleep() name.
> > >
> > > 1.
> > > The problem is that, recently we have run into a precedent when a user
> > > intended to give a second argument to kfree_rcu() API but forgot to do
> > > it in a code so a call became as a single argument of kfree_rcu() API.
> > >
> > > 2.
> > > Such mistyping can lead to hidden bags where sleeping is forbidden.
> > >
> > > 3.
> > > _mightsleep() prefix gives much more information for which contexts it
> > > can be used for.
> > >
> > > Uladzislau Rezki (Sony) (13):
> > >   rcu/kvfree: Add kvfree_rcu_mightsleep() and kfree_rcu_mightsleep()
> > >   drbd: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
> > >   misc: vmw_vmci: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
> > >   tracing: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
> > >   lib/test_vmalloc.c: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
> > >   net/sysctl: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
> > >   RDMA/rxe: Rename kfree_rcu() to kfree_rcu_mightsleep()
> > >   net/mlx5: Rename kfree_rcu() to kfree_rcu_mightsleep()
> > >   ext4/super: Rename kfree_rcu() to kfree_rcu_mightsleep()
> > >   ipvs: Rename kfree_rcu() to kfree_rcu_mightsleep()
> > >   rcuscale: Rename kfree_rcu() to kfree_rcu_mightsleep()
> > >   doc: Update whatisRCU.rst
> > >   rcu/kvfree: Eliminate k[v]free_rcu() single argument macro
> > 
> > Hi,
> > 
> > Not sure if you guys noticed but on latest rcu/dev:
> > 
> > net/netfilter/ipvs/ip_vs_est.c: In function ‘ip_vs_stop_estimator’:
> > net/netfilter/ipvs/ip_vs_est.c:552:15: error: macro "kfree_rcu" requires 2
> > arguments, but only 1 given
> >    kfree_rcu(td);
> >                ^
> > net/netfilter/ipvs/ip_vs_est.c:552:3: error: ‘kfree_rcu’ undeclared (first use in
> > this function); did you mean ‘kfree_skb’?
> >    kfree_rcu(td);
> >    ^~~~~~~~~
> >    kfree_skb
> > net/netfilter/ipvs/ip_vs_est.c:552:3: note: each undeclared identifier is
> > reported only once for each function it appears in
> 
> Hi Frederic Weisbecker,
> 
> I encountered the same build error as yours. 
> Per the discussion link below, the fix for this build error by Uladzislau Rezki will be picked up by some other maintainer's branch?
> @Paul E . McKenney, please correct me if my understanding is wrong. 😊
> 
>     https://lore.kernel.org/rcu/Y9qc+lgR1CgdszKs@salvia/

Pablo and Julian, how are things coming with that patch?

							Thanx, Paul