linux-kernel - Re: whole bunch o' new IB warnings

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Message-ID: <adaejkf4luy.fsf@cisco.com>
Date:	Wed, 13 Jun 2007 13:53:41 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: whole bunch o' new IB warnings

 > Current git tree on x86-64 (make allmodconfig) wants fixing for 2.6.22:
 > 
 > drivers/infiniband/hw/mlx4/qp.c: In function set_rq_size:
 > drivers/infiniband/hw/mlx4/qp.c:210: warning: comparison of distinct
 > pointer types lacks a cast

Thanks, you're right.  You have to admit, it's pretty amusing how many
times roundup_pow_of_two() expands its argument (via ilog2)...

Anyway, I have this queued up to fix it.  I'll ask Linus to pull shortly.

commit 42c059ea2b0aac5f961253ba81c1b464d181a600
Author: Roland Dreier <rolandd@...co.com>
Date:   Tue Jun 12 10:52:02 2007 -0700

    IB/mlx4: Fix warning in rounding up queue sizes
    
    Doing max(1, foo) where foo is u32 generates a warning, because 1 is a
    signed constant.  Fix this by using 1U instead.
    
    Signed-off-by: Roland Dreier <rolandd@...co.com>

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 5c6d054..4c15fa3 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -207,8 +207,8 @@ static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
 		if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
 			return -EINVAL;
 
-		qp->rq.max	 = roundup_pow_of_two(max(1, cap->max_recv_wr));
-		qp->rq.max_gs	 = roundup_pow_of_two(max(1, cap->max_recv_sge));
+		qp->rq.max	 = roundup_pow_of_two(max(1U, cap->max_recv_wr));
+		qp->rq.max_gs	 = roundup_pow_of_two(max(1U, cap->max_recv_sge));
 		qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
 	}
 
-
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