linux-kernel - Re: [PATCH] crypto: Jitter RNG - use ktime_get_raw

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Message-ID: <1724645.8YjKaqazLv@positron.chronox.de>
Date:	Tue, 21 Jun 2016 20:49:17 +0200
From:	Stephan Mueller <smueller@...onox.de>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Arnd Bergmann <arnd@...db.de>,
	Alexander Kuleshov <kuleshovmail@...il.com>,
	y2038 Mailman List <y2038@...ts.linaro.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-crypto@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] crypto: Jitter RNG - use ktime_get_raw_ns as fallback

Am Dienstag, 21. Juni 2016, 11:11:42 schrieb John Stultz:

Hi John,

> I don't see in the above an explanation of *why* you're using
> ktime_get_raw_ns() instead of ktime_get_ns().

Could you help me understand what the difference is or point me to some 
documentation? I understood that we only talked about the _raw variant.
> 
> Also the bit about time running backwards being ok is confusing since
> you're not using the "fast" accessor where that would be a risk.

Ok, if the running backwards hint is only applicable to the _fast variants, I 
can certainly drop it.

Thanks
Stephan