linux-kernel - Re: [PATCH v1 0/5] convert tree to get_random_u32

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Message-ID: <Y1bAnU4pCczkw5j8@zx2c4.com>
Date:   Mon, 24 Oct 2022 18:43:09 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Richard Weinberger <richard@....at>,
        "Darrick J . Wong" <djwong@...nel.org>,
        SeongJae Park <sj@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Helge Deller <deller@....de>, netdev@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mmc@...r.kernel.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH v1 0/5] convert tree to
 get_random_u32_{below,above,between}()

On Sun, Oct 23, 2022 at 05:07:13PM -0400, Theodore Ts'o wrote:
> On Fri, Oct 21, 2022 at 11:03:22PM -0700, Jakub Kicinski wrote:
> > On Sat, 22 Oct 2022 07:47:06 +0200 Jason A. Donenfeld wrote:
> > > On Fri, Oct 21, 2022 at 10:32:42PM -0700, Jakub Kicinski wrote:
> > > > But whatever. I mean - hopefully there aren't any conflicts in the ~50
> > > > networking files you touch. I just wish that people didn't pipe up with
> > > > the tree wide changes right after the merge window. Feels like the
> > > > worst possible timing.  
> > > 
> > > Oh, if the timing is what makes this especially worrisome, I have
> > > no qualms about rebasing much later, and reposting this series then.
> > > I'll do that.
> > 
> > Cool, thanks! I promise to not be grumpy if you repost around rc6 :)
> 
> One way of making things less painful for the stable branch and for
> the upstream branch is to *add* new helpers instead of playing
> replacement games like s/prandom_u32_max/get_random_u32_below/.  This
> is what causes the patch conflict problems.
> 
> One advantage of at least adding the new functions to the stable
> branches, even if we don't do the wholesale replacement, is that it

That's a good idea. I'll also save the removal commit, anyhow, for a
separate thing at the end of 6.2 rc1, so that -next doesn't have issues
either.  That's how things wound up going down for the first tranche of
these, and that worked well.

Jason