linux-kernel - [PATCH 29 of 33] IB/ipath - fix unit selection due to all cpu affinity bits set

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Message-Id: <8c4f730dbde3eed6e066.1173995113@iqa-25.internal.keyresearch.com>
Date:	Thu, 15 Mar 2007 14:45:13 -0700
From:	Bryan O'Sullivan <bos@...hscale.com>
To:	rdreier@...co.com
Cc:	openib-general@...nfabrics.org, linux-kernel@...r.kernel.org
Subject: [PATCH 29 of 33] IB/ipath - fix unit selection due to all cpu
	affinity bits set

# HG changeset patch
# User Bryan O'Sullivan <bos@...hscale.com>
# Date 1173994465 25200
# Node ID 8c4f730dbde3eed6e066ead5be4746d58840f24f
# Parent  b436c73d4fe312c3cba092d5f642de5c0ff6aa91
IB/ipath - fix unit selection due to all cpu affinity bits set

At some point things changed so that all the affinity bits can be
set, but cpus_full() macro is not true.  This caused problems with
the unit selection logic on multi-unit (board) configurations.

Signed-off-by: Dave Olson <dave.olson@...gic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@...gic.com>

diff -r b436c73d4fe3 -r 8c4f730dbde3 drivers/infiniband/hw/ipath/ipath_file_ops.c
--- a/drivers/infiniband/hw/ipath/ipath_file_ops.c	Thu Mar 15 14:34:25 2007 -0700
+++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c	Thu Mar 15 14:34:25 2007 -0700
@@ -1592,15 +1592,16 @@ static int find_best_unit(struct file *f
 	 */
 	if (!cpus_empty(current->cpus_allowed) &&
 	    !cpus_full(current->cpus_allowed)) {
-		int ncpus = num_online_cpus(), curcpu = -1;
+		int ncpus = num_online_cpus(), curcpu = -1, nset = 0;
 		for (i = 0; i < ncpus; i++)
 			if (cpu_isset(i, current->cpus_allowed)) {
 				ipath_cdbg(PROC, "%s[%u] affinity set for "
-					   "cpu %d\n", current->comm,
-					   current->pid, i);
+					   "cpu %d/%d\n", current->comm,
+					   current->pid, i, ncpus);
 				curcpu = i;
+				nset++;
 			}
-		if (curcpu != -1) {
+		if (curcpu != -1 && nset != ncpus) {
 			if (npresent) {
 				prefunit = curcpu / (ncpus / npresent);
 				ipath_cdbg(PROC,"%s[%u] %d chips, %d cpus, "
-
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