linux-kernel - Re: [-mm PATCH] Memory controller improve user interface (v3)

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Message-ID: <6599ad830709040019r17861771we2a0893c0c160723@mail.gmail.com>
Date:	Tue, 4 Sep 2007 00:19:22 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Linux Containers" <containers@...ts.osdl.org>,
	"Linux MM Mailing List" <linux-mm@...ck.org>,
	"David Rientjes" <rientjes@...gle.com>,
	"Dave Hansen" <haveblue@...ibm.com>
Subject: Re: [-mm PATCH] Memory controller improve user interface (v3)

On 9/3/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> Paul Menage wrote:
> > On 9/2/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> >> -       s += sprintf(s, "%lu\n", *val);
> >> +       if (read_strategy)
> >> +               s += read_strategy(*val, s);
> >> +       else
> >> +               s += sprintf(s, "%lu\n", *val);
> >
> > This would be better as %llu
> >
>
> Hi, Paul,
>
> This does not need fixing, since the other counters like failcnt are
> still unsigned long
>

But val is an unsigned long long*. So printing *val with %lu will
break (at least a warning, and maybe corruption if you had other
parameters) on 32-bit archs.

Paul
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