linux-kernel - Re: 2.6.23-rc2-mm1: silly df numbers on 32bit extN

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Message-Id: <20070809135614.cf1493b7.akpm@linux-foundation.org>
Date:	Thu, 9 Aug 2007 13:56:14 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc2-mm1: silly df numbers on 32bit extN

On Thu, 9 Aug 2007 21:17:20 +0100 (BST)
Hugh Dickins <hugh@...itas.com> wrote:

> On Thu, 9 Aug 2007, Andrew Morton wrote:
> > 
> > +lib-make-percpu_counter_add-take-s64.patch
> 
> lib-make-percpu_counter_add-take-s64.patch looks sensible, but it doesn't
> actually work on 32-bit architectures: several users of percpu_counter_add
> are passing -unsignedlong as the amount, which is not promoted to s64 in
> the desired way, so "df" on extN filesystems is showing silly numbers.
> 
> The hack below (say long instead of s64 or s32) may be good as hotfix for
> 2.6.23-rc2-mm1, but is probably the worst of solutions.  Perhaps take-s64
> should be reverted, perhaps there should be a percpu_counter_sub and the
> filesystems use that instead of saying -unsignedlong, perhaps they should
> use a cast or a long or an s64.  I don't know, but here's this for now...

Thanks.  I think I'll quietly tip the whole patch series overboard and
shoot for a quick rc2-mm2 rather than trying to patch it up in-situ.

I haven't had a chance to review it all in recent months.  Vague first
impressions are that it all goes a bit rampant and changes more than it
needs to, but I'll take a closer look at that if Peter can provide us with
the next version (please).

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