linux-kernel - Re: [resend PATCH for 3.2] procfs: do not confuse jiffies with cputime64

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Message-Id: <20111221155624.1555d8a4.akpm@linux-foundation.org>
Date:	Wed, 21 Dec 2011 15:56:24 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andreas Schwab <schwab@...ux-m68k.org>
Cc:	Michal Hocko <mhocko@...e.cz>, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org,
	"Artem S. Tashkinov" <t.artem@...lcity.com>,
	Dave Jones <davej@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [resend PATCH for 3.2] procfs: do not confuse jiffies with
 cputime64_t

On Thu, 22 Dec 2011 00:50:06 +0100
Andreas Schwab <schwab@...ux-m68k.org> wrote:

> Andrew Morton <akpm@...ux-foundation.org> writes:
> 
> > From: Andreas Schwab <schwab@...ux-m68k.org>
> > Subject: procfs: do not confuse jiffies with cputime64_t
> >
> > get_{idle,iowait}_time are supposed to return cputime64_t values, not
> > jiffies.  Add usecs_to_cputime64 for this.
> 
> For most architectures (which use the asm-generic/cputime.h) jiffies use
> the same unit as cputime64_t values, but ia64, powerpc and s390 make
> them different.
> 

OK, but

a) what effect does this problem have upon users of the kernel?

b) which kernel version(s) are affected?
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