linux-kernel - Re: [PATCH v3] random: handle archrandom with multiple longs

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Message-ID: <Yt5gBZe9F1BE0MVF@zn.tnic>
Date:   Mon, 25 Jul 2022 11:19:01 +0200
From:   Borislav Petkov <bp@...e.de>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        x86@...nel.org, Will Deacon <will@...nel.org>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Johannes Berg <johannes@...solutions.net>,
        Mark Rutland <mark.rutland@....com>,
        Harald Freudenberger <freude@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v3] random: handle archrandom with multiple longs

On Tue, Jul 19, 2022 at 03:02:07PM +0200, Jason A. Donenfeld wrote:
> Since callers need to check this return value and loop anyway, each arch
> implementation does not bother implementing its own loop to try again to
> fill the maximum number of longs. Additionally, all existing callers
> pass in a constant max_longs parameter.

Hmm, maybe this has come up already but it reads weird.

If I have a function arch_get_random_longs(), I'd expect it to give me
the number of longs I requested or say, error.

Why do the callers need to loop?

If I have to loop, I'd call the "get me one long" function and loop N
times.

-- 
Regards/Gruss,
    Boris.

SUSE Software Solutions Germany GmbH
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