linux-ext4 - Re: [RFC] [PATCH 1/1] Nanosecond timestamps

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Message-ID: <20070208103325.GA28900@lombardij>
Date:	Thu, 8 Feb 2007 11:33:25 +0100
From:	Johann Lombardi <johann.lombardi@...l.net>
To:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Cc:	Andreas Dilger <adilger@...sterfs.com>,
	Kalpak Shah <kalpak@...sterfs.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>, tytso <tytso@....edu>,
	sct <sct@...hat.com>
Subject: Re: [RFC] [PATCH 1/1] Nanosecond timestamps

On Wed, Feb 07, 2007 at 03:05:39PM -0600, Dave Kleikamp wrote:
> On Wed, 2007-02-07 at 13:39 -0700, Andreas Dilger wrote:
> > You are right - this works fine on little endian systems, but fails on
> > big endian systems where you will get the other half of the word.
> > 
> > This has been a bug in several places already, and I wonder if the
> > le*_to_cpu() and cpu_to_le*() macros shouldn't do some type checking
> > instead of just casting the variable to the specified type?
> 
> I think that sparse will catch this.  To get the endian checks you need
> to do something like this:
> 
> make C=2 CF="-D__CHECK_ENDIAN__"'

Indeed:

  CHECK   fs/ext3/super.c
  fs/ext3/super.c:1787:8: warning: cast to restricted type
  fs/ext3/super.c:1789:6: warning: cast to restricted type
  fs/ext3/super.c:1791:8: warning: cast to restricted type
  fs/ext3/super.c:1793:6: warning: cast to restricted type

Thanks,
Johann
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