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From: Roland Dreier <rdreier@cisco.com>
To: Andy Grover <andy.grover@oracle.com>
Cc: netdev@vger.kernel.org, rds-devel@oss.oracle.com
Subject: Re: [PATCH 6/9] RDS: Fix ordering in a conditional
Date: Mon, 30 Mar 2009 21:27:53 -0700	[thread overview]
Message-ID: <adak566e2pi.fsf@cisco.com> (raw)
In-Reply-To: <1238438693-29540-7-git-send-email-andy.grover@oracle.com> (Andy Grover's message of "Mon, 30 Mar 2009 11:44:50 -0700")

 > -	if (0 <= ret && (unsigned) ret < nr_pages) {
 > +	if (ret > 0 && (unsigned) ret < nr_pages) {

This is not an equivalent transformation -- the original code is true if
ret == 0, while the new code is false.

Also it seems you don't need the unsigned cast here, since the clause
before just checked that ret is positive?

 - R.

  reply	other threads:[~2009-03-31  4:27 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-30 18:44 [PATCH 0/9] RDS updates Andy Grover
2009-03-30 18:44 ` [PATCH 1/9] RDS: Fix m_rs_lock deadlock Andy Grover
2009-03-30 18:44 ` [PATCH 2/9] RDS/IW+IB: Set recv ring low water mark to 1/2 full Andy Grover
2009-03-30 18:44 ` [PATCH 3/9] RDS: Correct some iw references in rdma_transport.c Andy Grover
2009-03-30 18:44 ` [PATCH 4/9] RDS/IW+IB: Set the RDS_LL_SEND_FULL bit when we're throttled Andy Grover
2009-03-30 18:44 ` [PATCH 5/9] RDS/IW+IB: Allow max credit advertise window Andy Grover
2009-03-30 18:44 ` [PATCH 6/9] RDS: Fix ordering in a conditional Andy Grover
2009-03-31  4:27   ` Roland Dreier [this message]
2009-03-31  6:56     ` Andrew Grover
2009-03-31 21:50       ` David Miller
2009-03-30 18:44 ` [PATCH 7/9] RDS: Establish connection before parsing CMSGs Andy Grover
2009-03-30 18:44 ` [PATCH 8/9] RDS: Rewrite connection cleanup Andy Grover
2009-03-30 18:44 ` [PATCH 9/9] RDS: use get_user_pages_fast() Andy Grover

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