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Message-ID: <Y0H7rcJ3/JOyDYU8@zx2c4.com>
Date: Sun, 9 Oct 2022 00:37:33 +0200
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>,
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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>,
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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 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.
>
> David
>
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)
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