linux-kernel - [PATCH 3/4] x86_32: apic/es7000_32, fix cpu_mask_to

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Date:	Mon,  2 Mar 2009 10:53:57 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	mingo@...hat.com
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 3/4] x86_32: apic/es7000_32, fix cpu_mask_to_apicid

Perform same-cluster checking even for masks with all (nr_cpu_ids)
bits set and report BAD_APICID on failure.

While at it, convert it to for_each_cpu.

Signed-off-by: Jiri Slaby <jirislaby@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
---
 arch/x86/kernel/apic/es7000_32.c |   30 ++++++++++--------------------
 1 files changed, 10 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 9b9e86f..4d8830f 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -577,32 +577,22 @@ static int es7000_check_phys_apicid_present(int cpu_physical_apicid)
 
 static unsigned int es7000_cpu_mask_to_apicid(const cpumask_t *cpumask)
 {
-	unsigned int cpu, num_bits_set, cpus_found = 0;
-	int apicid;
+	unsigned int round = 0;
+	int cpu, uninitialized_var(apicid);
 
-	num_bits_set = cpumask_weight(cpumask);
-	/* Return id to all */
-	if (num_bits_set == nr_cpu_ids)
-		return es7000_cpu_to_logical_apicid(0);
 	/*
-	 * The cpus in the mask must all be on the apic cluster.  If are not
-	 * on the same apicid cluster return default value of target_cpus():
+	 * The cpus in the mask must all be on the apic cluster.
 	 */
-	cpu = cpumask_first(cpumask);
-	apicid = es7000_cpu_to_logical_apicid(cpu);
-	while (cpus_found < num_bits_set) {
-		if (cpumask_test_cpu(cpu, cpumask)) {
-			int new_apicid = es7000_cpu_to_logical_apicid(cpu);
+	for_each_cpu(cpu, cpumask) {
+		int new_apicid = es7000_cpu_to_logical_apicid(cpu);
 
-			if (APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
-				WARN(1, "Not a valid mask!");
+		if (round && APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
+			WARN(1, "Not a valid mask!");
 
-				return es7000_cpu_to_logical_apicid(0);
-			}
-			apicid = new_apicid;
-			cpus_found++;
+			return BAD_APICID;
 		}
-		cpu++;
+		apicid = new_apicid;
+		round++;
 	}
 	return apicid;
 }
-- 
1.6.1.3

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