[PATCH 4/6] sched: drop sched.h dependency on cpumask

[Yury Norov <yury.norov@gmail.com>]

sched.h needs cpumask.h mostly for types declaration. Now that we have
cpumask_types.h, which is a significantly smaller header, we can rely on
it.

The only exception is UP stub for set_cpus_allowed_ptr(). The function
needs to test bit #0 in a @new_mask, which can be trivially opencoded.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 include/linux/sched.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 98abb07de149..f2f907ef1389 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -13,7 +13,7 @@
 #include <asm/processor.h>
 #include <linux/thread_info.h>
 #include <linux/preempt.h>
-#include <linux/cpumask.h>
+#include <linux/cpumask_types.h>
 
 #include <linux/cache.h>
 #include <linux/irqflags_types.h>
@@ -1778,7 +1778,8 @@ static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpuma
 }
 static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask)
 {
-	if (!cpumask_test_cpu(0, new_mask))
+	/* Opencoded cpumask_test_cpu(0, new_mask) to avoid dependency on cpumask.h */
+	if ((*cpumask_bits(new_mask) & 1) == 0)
 		return -EINVAL;
 	return 0;
 }
-- 
2.40.1