show isolated cpus in sysfs

[firefly-linux-kernel-4.4.55.git] / drivers / base / cpu.c

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index f160ea44a86d68a26b689b5ff7c5f0bcaf5ec74e..ea23ee7b545b17f10c8bed3d826b49de15a978b0 100644 (file)
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -265,6 +265,17 @@ static ssize_t print_cpus_offline(struct device *dev,
 }
 static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL);
 
+static ssize_t print_cpus_isolated(struct device *dev,
+                                 struct device_attribute *attr, char *buf)
+{
+       int n = 0, len = PAGE_SIZE-2;
+
+       n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(cpu_isolated_map));
+
+       return n;
+}
+static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL);
+
 static void cpu_device_release(struct device *dev)
 {
        /*
@@ -431,6 +442,7 @@ static struct attribute *cpu_root_attrs[] = {
        &cpu_attrs[2].attr.attr,
        &dev_attr_kernel_max.attr,
        &dev_attr_offline.attr,
+       &dev_attr_isolated.attr,
 #ifdef CONFIG_GENERIC_CPU_AUTOPROBE
        &dev_attr_modalias.attr,
 #endif