arm: Optimize ttwu IPI

hulk inclusion
category: feature
bugzilla: 176961 https://gitee.com/openeuler/kernel/issues/I4E05T

-------------------

When it is to wake up a task in a remote cpu shared LLC , we can
simply set need_resched flag, waking up a cpu that is in polling
idle. This wakeup action does not require an IPI.

But the premise is that it need to support _TIF_POLLING_NRFLAG
Signed-off-by: NLi Hua <hucool.lihua@huawei.com>
Reviewed-by: NChen Hui <judy.chenhui@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm/include/asm/thread_info.h

@@ -145,6 +145,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp *,
 #define TIF_SECCOMP		7	/* seccomp syscall filtering active */
 #define TIF_PATCH_PENDING	8	/* pending live patching update */
 
+#define TIF_POLLING_NRFLAG     16      /* idle is polling for TIF_NEED_RESCHED */
 #define TIF_USING_IWMMXT	17
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 #define TIF_RESTORE_SIGMASK	20
@@ -157,6 +158,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp *,
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
+#define _TIF_POLLING_NRFLAG    (1 << TIF_POLLING_NRFLAG)
 #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
 #define _TIF_PATCH_PENDING	(1 << TIF_PATCH_PENDING)