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@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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 9b9e86f3cfd..4d8830ffe48 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;
 }