linux-kernel - Re: [PATCH RFC v0] random: block in /dev/urandom

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Message-ID: <alpine.DEB.2.21.2202122309560.34636@angie.orcam.me.uk>
Date:   Sat, 12 Feb 2022 23:13:33 +0000 (GMT)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Joshua Kinard <kumba@...too.org>
cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-m68k@...ts.linux-m68k.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Eric Biggers <ebiggers@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Lennart Poettering <mzxreary@...inter.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Theodore Ts'o <tytso@....edu>,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH RFC v0] random: block in /dev/urandom

On Sat, 12 Feb 2022, Joshua Kinard wrote:

> # grep -r "PRID_IMP_R6000" *
> arch/mips/include/asm/cpu.h:70:#define PRID_IMP_R6000           0x0300
>     /* Same as R3000A  */
> arch/mips/include/asm/cpu.h:72:#define PRID_IMP_R6000A          0x0600
> arch/mips/include/asm/timex.h:94:       else if (likely(imp !=
> PRID_IMP_R6000 && imp != PRID_IMP_R6000A))
> 
> I'd say it's better to remove the check and simplify the conditional to
> eliminate this corner case.  Maybe keep the #defines around for
> documentation, but even that may not be necessary for CPUs that likely don't
> exist anymore.

 IIRC Ralf used to have a working R6k machine, but I have no idea what has 
happened to it.  No port of Linux has been made for that system though, 
that's for sure.

  Maciej