linux-kernel - Re: [PATCH RFC v1 00/10] archs/random: fallback to using sched

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Date:   Sun, 10 Apr 2022 23:38:26 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, "Theodore Ts'o" <tytso@....edu>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "David S . Miller" <davem@...emloft.net>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H . Peter Anvin" <hpa@...or.com>, Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        sparclinux@...r.kernel.org, linux-um@...ts.infradead.org,
        X86 ML <x86@...nel.org>, linux-xtensa@...ux-xtensa.org
Subject: Re: [PATCH RFC v1 00/10] archs/random: fallback to using
 sched_clock() if no cycle counter

Hi Thomas,

On Sun, Apr 10, 2022 at 10:57 PM Thomas Gleixner <tglx@...utronix.de> wrote:
> > Not yet having too much knowledge, I'm tentatively leaning toward the
> > safe side, of just using ktime_read_raw_clock() in the current places
> > that return zero all the time -- that is, for the purpose this patchset
> > has.
>
> That's probably a good approach and it's init/runtime discoverable.

Alright then. I'll send out a v2 and we'll see how that looks.

Jason