Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds

[linux-2.6-omap-h63xx.git] / fs / proc / proc_misc.c

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index d24b8d46059a4e284b1af8f194a8b328bfb15fbb..bee251cb87c8c42c3d051ec2ea53df209e422c52 100644 (file)
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -445,6 +445,11 @@ static int show_stat(struct seq_file *p, void *v)
        cputime64_t user, nice, system, idle, iowait, irq, softirq, steal;
        u64 sum = 0;
        struct timespec boottime;
+       unsigned int *per_irq_sum;
+
+       per_irq_sum = kzalloc(sizeof(unsigned int)*NR_IRQS, GFP_KERNEL);
+       if (!per_irq_sum)
+               return -ENOMEM;
 
        user = nice = system = idle = iowait =
                irq = softirq = steal = cputime64_zero;
@@ -462,8 +467,11 @@ static int show_stat(struct seq_file *p, void *v)
                irq = cputime64_add(irq, kstat_cpu(i).cpustat.irq);
                softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
                steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
-               for (j = 0 ; j < NR_IRQS ; j++)
-                       sum += kstat_cpu(i).irqs[j];
+               for (j = 0; j < NR_IRQS; j++) {
+                       unsigned int temp = kstat_cpu(i).irqs[j];
+                       sum += temp;
+                       per_irq_sum[j] += temp;
+               }
        }
 
        seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu %llu\n",
@@ -499,9 +507,10 @@ static int show_stat(struct seq_file *p, void *v)
        }
        seq_printf(p, "intr %llu", (unsigned long long)sum);
 
-#if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64)
+#ifndef CONFIG_SMP
+       /* Touches too many cache lines on SMP setups */
        for (i = 0; i < NR_IRQS; i++)
-               seq_printf(p, " %u", kstat_irqs(i));
+               seq_printf(p, " %u", per_irq_sum[i]);
 #endif
 
        seq_printf(p,
@@ -516,6 +525,7 @@ static int show_stat(struct seq_file *p, void *v)
                nr_running(),
                nr_iowait());
 
+       kfree(per_irq_sum);
        return 0;
 }