[tip: sched/core] sched: Make nr_iowait() return 32-bit value

[tip-bot2 for Alexey Dobriyan]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     9745516841a55c77163a5d549bce1374d776df54
Gitweb:        https://git.kernel.org/tip/9745516841a55c77163a5d549bce1374d776df54
Author:        Alexey Dobriyan <adobriyan@xxxxxxxxx>
AuthorDate:    Thu, 22 Apr 2021 23:02:26 +03:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Wed, 12 May 2021 21:34:15 +02:00

sched: Make nr_iowait() return 32-bit value

Creating 2**32 tasks to wait in D-state is impossible and wasteful.

Return "unsigned int" and save on REX prefixes.

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210422200228.1423391-2-adobriyan@xxxxxxxxx
---
 fs/proc/stat.c             | 2 +-
 include/linux/sched/stat.h | 2 +-
 kernel/sched/core.c        | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 941605d..6561a06 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -201,7 +201,7 @@ static int show_stat(struct seq_file *p, void *v)
 		"btime %llu\n"
 		"processes %lu\n"
 		"procs_running %u\n"
-		"procs_blocked %lu\n",
+		"procs_blocked %u\n",
 		nr_context_switches(),
 		(unsigned long long)boottime.tv_sec,
 		total_forks,
diff --git a/include/linux/sched/stat.h b/include/linux/sched/stat.h
index 73606b3..81d9b53 100644
--- a/include/linux/sched/stat.h
+++ b/include/linux/sched/stat.h
@@ -19,7 +19,7 @@ DECLARE_PER_CPU(unsigned long, process_counts);
 extern int nr_processes(void);
 extern unsigned int nr_running(void);
 extern bool single_task_running(void);
-extern unsigned long nr_iowait(void);
+extern unsigned int nr_iowait(void);
 extern unsigned long nr_iowait_cpu(int cpu);
 
 static inline int sched_info_on(void)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 2c6cdb0..fadf2bf 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4774,9 +4774,9 @@ unsigned long nr_iowait_cpu(int cpu)
  * Task CPU affinities can make all that even more 'interesting'.
  */
 
-unsigned long nr_iowait(void)
+unsigned int nr_iowait(void)
 {
-	unsigned long i, sum = 0;
+	unsigned int i, sum = 0;
 
 	for_each_possible_cpu(i)
 		sum += nr_iowait_cpu(i);