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Message-ID: <CAHmME9ojgUnrp+Mys3pzJZ=0C7RHbgsm-wOkWk-GdW2dnJwf8g@mail.gmail.com>
Date: Sat, 8 Oct 2022 18:26:00 -0600
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: David Laight <David.Laight@...lab.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"patches@...ts.linux.dev" <patches@...ts.linux.dev>,
Andreas Noever <andreas.noever@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Borislav Petkov <bp@...en8.de>,
Catalin Marinas <catalin.marinas@....com>,
Christoph Böhmwalder
<christoph.boehmwalder@...bit.com>, Christoph Hellwig <hch@....de>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Daniel Borkmann <daniel@...earbox.net>,
Dave Airlie <airlied@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Florian Westphal <fw@...len.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"H . Peter Anvin" <hpa@...or.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Helge Deller <deller@....de>,
Herbert Xu <herbert@...dor.apana.org.au>,
Huacai Chen <chenhuacai@...nel.org>,
Hugh Dickins <hughd@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
"James E . J . Bottomley" <jejb@...ux.ibm.com>,
Jan Kara <jack@...e.com>, Jason Gunthorpe <jgg@...pe.ca>,
Jens Axboe <axboe@...nel.dk>,
Johannes Berg <johannes@...solutions.net>,
Jonathan Corbet <corbet@....net>,
Jozsef Kadlecsik <kadlec@...filter.org>,
KP Singh <kpsingh@...nel.org>,
Kees Cook <keescook@...omium.org>,
Marco Elver <elver@...gle.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Pablo Neira Ayuso <pablo@...filter.org>,
Paolo Abeni <pabeni@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Richard Weinberger <richard@....at>,
Russell King <linux@...linux.org.uk>,
"Theodore Ts'o" <tytso@....edu>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Thomas Gleixner <tglx@...utronix.de>,
Thomas Graf <tgraf@...g.ch>,
Ulf Hansson <ulf.hansson@...aro.org>,
Vignesh Raghavendra <vigneshr@...com>,
WANG Xuerui <kernel@...0n.name>, Will Deacon <will@...nel.org>,
Yury Norov <yury.norov@...il.com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>,
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"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
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"linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
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"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
"x86@...nel.org" <x86@...nel.org>,
Toke Høiland-Jørgensen <toke@...e.dk>,
Chuck Lever <chuck.lever@...cle.com>, Jan Kara <jack@...e.cz>,
Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH v4 4/6] treewide: use get_random_u32() when possible
On Sat, Oct 8, 2022 at 4:37 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
>
> On Sat, Oct 08, 2022 at 10:18:45PM +0000, David Laight wrote:
> > From: Jason A. Donenfeld
> > > Sent: 07 October 2022 19:01
> > >
> > > The prandom_u32() function has been a deprecated inline wrapper around
> > > get_random_u32() for several releases now, and compiles down to the
> > > exact same code. Replace the deprecated wrapper with a direct call to
> > > the real function. The same also applies to get_random_int(), which is
> > > just a wrapper around get_random_u32().
> > >
> > ...
> > > diff --git a/net/802/garp.c b/net/802/garp.c
> > > index f6012f8e59f0..c1bb67e25430 100644
> > > --- a/net/802/garp.c
> > > +++ b/net/802/garp.c
> > > @@ -407,7 +407,7 @@ static void garp_join_timer_arm(struct garp_applicant *app)
> > > {
> > > unsigned long delay;
> > >
> > > - delay = (u64)msecs_to_jiffies(garp_join_time) * prandom_u32() >> 32;
> > > + delay = (u64)msecs_to_jiffies(garp_join_time) * get_random_u32() >> 32;
> > > mod_timer(&app->join_timer, jiffies + delay);
> > > }
> > >
> > > diff --git a/net/802/mrp.c b/net/802/mrp.c
> > > index 35e04cc5390c..3e9fe9f5d9bf 100644
> > > --- a/net/802/mrp.c
> > > +++ b/net/802/mrp.c
> > > @@ -592,7 +592,7 @@ static void mrp_join_timer_arm(struct mrp_applicant *app)
> > > {
> > > unsigned long delay;
> > >
> > > - delay = (u64)msecs_to_jiffies(mrp_join_time) * prandom_u32() >> 32;
> > > + delay = (u64)msecs_to_jiffies(mrp_join_time) * get_random_u32() >> 32;
> > > mod_timer(&app->join_timer, jiffies + delay);
> > > }
> > >
> >
> > Aren't those:
> > delay = prandom_u32_max(msecs_to_jiffies(xxx_join_time));
>
> Probably, but too involved and peculiar for this cleanup.
>
> Feel free to send a particular patch to that maintainer.
I guess the cocci patch looks like this, so maybe I'll put that in 1/7
if I respin this.
@@
expression E;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u64;
@@
- ((u64)(E) * get_random_u32() >> 32)
+ prandom_u32_max(E)
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