cpumask: use new cpus_scnprintf function

  * Cleaned up references to cpumask_scnprintf() and added new
    cpulist_scnprintf() interfaces where appropriate.

  * Fix some small bugs (or code efficiency improvments) for various uses
    of cpumask_scnprintf.

  * Clean up some checkpatch errors.

Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 53 insertions, 12 deletions

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 8e3f25bb8f80..12fde2d03d69 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -19,22 +19,34 @@ static struct sysdev_class node_class = {
 };
 
 
-static ssize_t node_read_cpumap(struct sys_device * dev, char * buf)
+static ssize_t node_read_cpumap(struct sys_device *dev, int type, char *buf)
 {
         struct node *node_dev = to_node(dev);
         node_to_cpumask_ptr(mask, node_dev->sysdev.id);
         int len;
 
-        /* 2004/06/03: buf currently PAGE_SIZE, need > 1 char per 4 bits. */
-        BUILD_BUG_ON(MAX_NUMNODES/4 > PAGE_SIZE/2);
+        /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
+        BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
 
-        len = cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
+        len = type?
+                cpulist_scnprintf(buf, PAGE_SIZE-2, *mask):
+                cpumask_scnprintf(buf, PAGE_SIZE-2, *mask);
         buf[len++] = '\n';
         buf[len] = '\0';
         return len;
 }
 
-static SYSDEV_ATTR(cpumap, S_IRUGO, node_read_cpumap, NULL);
+static inline ssize_t node_read_cpumask(struct sys_device *dev, char *buf)
+{
+        return node_read_cpumap(dev, 0, buf);
+}
+static inline ssize_t node_read_cpulist(struct sys_device *dev, char *buf)
+{
+        return node_read_cpumap(dev, 1, buf);
+}
+
+static SYSDEV_ATTR(cpumap,  S_IRUGO, node_read_cpumask, NULL);
+static SYSDEV_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL);
 
 #define K(x) ((x) << (PAGE_SHIFT - 10))
 static ssize_t node_read_meminfo(struct sys_device * dev, char * buf)
@@ -150,6 +162,7 @@ int register_node(struct node *node, int num, struct node *parent)
 
         if (!error){
                 sysdev_create_file(&node->sysdev, &attr_cpumap);
+                sysdev_create_file(&node->sysdev, &attr_cpulist);
                 sysdev_create_file(&node->sysdev, &attr_meminfo);
                 sysdev_create_file(&node->sysdev, &attr_numastat);
                 sysdev_create_file(&node->sysdev, &attr_distance);
@@ -167,6 +180,7 @@ int register_node(struct node *node, int num, struct node *parent)
 void unregister_node(struct node *node)
 {
         sysdev_remove_file(&node->sysdev, &attr_cpumap);
+        sysdev_remove_file(&node->sysdev, &attr_cpulist);
         sysdev_remove_file(&node->sysdev, &attr_meminfo);
         sysdev_remove_file(&node->sysdev, &attr_numastat);
         sysdev_remove_file(&node->sysdev, &attr_distance);
diff --git a/drivers/base/topology.c b/drivers/base/topology.c
index e1d3ad4db2f0..fdf4044d2e74 100644
--- a/drivers/base/topology.c
+++ b/drivers/base/topology.c
@@ -40,15 +40,38 @@ static ssize_t show_##name(struct sys_device *dev, char *buf)	\
         return sprintf(buf, "%d\n", topology_##name(cpu));      \
 }
 
-#define define_siblings_show_func(name)                                 \
-static ssize_t show_##name(struct sys_device *dev, char *buf)           \
+static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf)
+{
+        ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
+        int n = 0;
+
+        if (len > 1) {
+                n = type?
+                        cpulist_scnprintf(buf, len-2, *mask):
+                        cpumask_scnprintf(buf, len-2, *mask);
+                buf[n++] = '\n';
+                buf[n] = '\0';
+        }
+        return n;
+}
+
+#define define_siblings_show_map(name)                                  \
+static inline ssize_t show_##name(struct sys_device *dev, char *buf)    \
 {                                                                       \
-        ssize_t len = -1;                                               \
         unsigned int cpu = dev->id;                                     \
-        len = cpumask_scnprintf(buf, NR_CPUS+1, topology_##name(cpu));  \
-        return (len + sprintf(buf + len, "\n"));                        \
+        return show_cpumap(0, &(topology_##name(cpu)), buf);            \
 }
 
+#define define_siblings_show_list(name)                                 \
+static inline ssize_t show_##name##_list(struct sys_device *dev, char *buf) \
+{                                                                       \
+        unsigned int cpu = dev->id;                                     \
+        return show_cpumap(1, &(topology_##name(cpu)), buf);            \
+}
+
+#define define_siblings_show_func(name)         \
+        define_siblings_show_map(name); define_siblings_show_list(name)
+
 #ifdef  topology_physical_package_id
 define_id_show_func(physical_package_id);
 define_one_ro(physical_package_id);
@@ -68,7 +91,9 @@ define_one_ro(core_id);
 #ifdef topology_thread_siblings
 define_siblings_show_func(thread_siblings);
 define_one_ro(thread_siblings);
-#define ref_thread_siblings_attr        &attr_thread_siblings.attr,
+define_one_ro(thread_siblings_list);
+#define ref_thread_siblings_attr        \
+                &attr_thread_siblings.attr, &attr_thread_siblings_list.attr,
 #else
 #define ref_thread_siblings_attr
 #endif
@@ -76,7 +101,9 @@ define_one_ro(thread_siblings);
 #ifdef topology_core_siblings
 define_siblings_show_func(core_siblings);
 define_one_ro(core_siblings);
-#define ref_core_siblings_attr          &attr_core_siblings.attr,
+define_one_ro(core_siblings_list);
+#define ref_core_siblings_attr          \
+                &attr_core_siblings.attr, &attr_core_siblings_list.attr,
 #else
 #define ref_core_siblings_attr
 #endif