percpu: use %*pb[l] to print bitmaps including cpumasks and nodemasks

printk and friends can now format bitmaps using '%*pb[l]'.  cpumask
and nodemask also provide cpumask_pr_args() and nodemask_pr_args()
respectively which can be used to generate the two printf arguments
necessary to format the specified cpu/nodemask.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/percpu.c b/mm/percpu.c
index d39e2f4..73c97a5 100644 (file)
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1528,7 +1528,6 @@ static void pcpu_dump_alloc_info(const char *lvl,
 int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
                                  void *base_addr)
 {
-       static char cpus_buf[4096] __initdata;
        static int smap[PERCPU_DYNAMIC_EARLY_SLOTS] __initdata;
        static int dmap[PERCPU_DYNAMIC_EARLY_SLOTS] __initdata;
        size_t dyn_size = ai->dyn_size;
@@ -1541,12 +1540,11 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
        int *unit_map;
        int group, unit, i;
 
-       cpumask_scnprintf(cpus_buf, sizeof(cpus_buf), cpu_possible_mask);
-
 #define PCPU_SETUP_BUG_ON(cond)        do {                                    \
        if (unlikely(cond)) {                                           \
                pr_emerg("PERCPU: failed to initialize, %s", #cond);    \
-               pr_emerg("PERCPU: cpu_possible_mask=%s\n", cpus_buf);   \
+               pr_emerg("PERCPU: cpu_possible_mask=%*pb\n",            \
+                        cpumask_pr_args(cpu_possible_mask));           \
                pcpu_dump_alloc_info(KERN_EMERG, ai);                   \
                BUG();                                                  \
        }                                                               \