cpumask: convert kernel trace functions further

Impact: Reduce future memory usage, use new cpumask API.

Since the last patch was created and acked, more old cpumask users
slipped into kernel/trace.

Mostly trivial conversions, except struct trace_iterator's "started"
member becomes a cpumask_var_t.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 9 insertions, 3 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 5d04e27f3b40..c580233add95 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1811,10 +1811,10 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
         if (!(iter->iter_flags & TRACE_FILE_ANNOTATE))
                 return;
 
-        if (cpu_isset(iter->cpu, iter->started))
+        if (cpumask_test_cpu(iter->cpu, iter->started))
                 return;
 
-        cpu_set(iter->cpu, iter->started);
+        cpumask_set_cpu(iter->cpu, iter->started);
         trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu);
 }
 
@@ -3114,10 +3114,15 @@ static int tracing_open_pipe(struct inode *inode, struct file *filp)
         if (!iter)
                 return -ENOMEM;
 
+        if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) {
+                kfree(iter);
+                return -ENOMEM;
+        }
+
         mutex_lock(&trace_types_lock);
 
         /* trace pipe does not show start of buffer */
-        cpus_setall(iter->started);
+        cpumask_setall(iter->started);
 
         iter->tr = &global_trace;
         iter->trace = current_trace;
@@ -3134,6 +3139,7 @@ static int tracing_release_pipe(struct inode *inode, struct file *file)
 {
         struct trace_iterator *iter = file->private_data;
 
+        free_cpumask_var(iter->started);
         kfree(iter);
         atomic_dec(&tracing_reader);