locking/qspinlock: Refactor the qspinlock slow path

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8T8XV

Reference: https://lore.kernel.org/linux-arm-kernel/20210514200743.3026725-3-alex.kogan@oracle.com



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Move some of the code manipulating the spin lock into separate functions.
This would allow easier integration of alternative ways to manipulate
that lock.

Signed-off-by: Alex Kogan <alex.kogan@oracle.com>
Reviewed-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Wei Li <liwei391@huawei.com>