[PATCH v2 1/4] sched/isolation: Fix style issues reported by checkpatch

[Leonardo Bras <leobras@xxxxxxxxxx>]

scripts/checkpatch.pl warns about:
- extern prototypes should be avoided in .h files
- Missing or malformed SPDX-License-Identifier tag in line 1

Fix those issues to avoid extra noise.

Signed-off-by: Leonardo Bras <leobras@xxxxxxxxxx>
---
 include/linux/sched/isolation.h | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h
index 8c15abd67aed9..762701f295d1c 100644
--- a/include/linux/sched/isolation.h
+++ b/include/linux/sched/isolation.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _LINUX_SCHED_ISOLATION_H
 #define _LINUX_SCHED_ISOLATION_H
 
@@ -20,12 +21,12 @@ enum hk_type {
 
 #ifdef CONFIG_CPU_ISOLATION
 DECLARE_STATIC_KEY_FALSE(housekeeping_overridden);
-extern int housekeeping_any_cpu(enum hk_type type);
-extern const struct cpumask *housekeeping_cpumask(enum hk_type type);
-extern bool housekeeping_enabled(enum hk_type type);
-extern void housekeeping_affine(struct task_struct *t, enum hk_type type);
-extern bool housekeeping_test_cpu(int cpu, enum hk_type type);
-extern void __init housekeeping_init(void);
+int housekeeping_any_cpu(enum hk_type type);
+const struct cpumask *housekeeping_cpumask(enum hk_type type);
+bool housekeeping_enabled(enum hk_type type);
+void housekeeping_affine(struct task_struct *t, enum hk_type type);
+bool housekeeping_test_cpu(int cpu, enum hk_type type);
+void __init housekeeping_init(void);
 
 #else
 
-- 
2.38.0