locking/arch: Move qrwlock.h include after qspinlock.h

include/asm-generic/qrwlock.h was trying to get arch_spin_is_locked via
asm-generic/qspinlock.h. However, this does not work because architectures
might be using queued rwlocks but not queued spinlocks (csky), or because they
might be defining their own queued_* macros before including asm/qspinlock.h.

To fix this, ensure that asm/spinlock.h always includes qrwlock.h after
defining arch_spin_is_locked (either directly for csky, or via
asm/qspinlock.h for other architectures). The only inclusion elsewhere
is in kernel/locking/qrwlock.c. That one is really unnecessary because
the file is only compiled in SMP configurations (config QUEUED_RWLOCKS
depends on SMP) and in that case linux/spinlock.h already includes
asm/qrwlock.h if needed, via asm/spinlock.h.

Reported-by: Guenter Roeck <[e-mail]>
Signed-off-by: Waiman Long <[e-mail]>
Fixes: 26128cb6c7e6 ("locking/rwlocks: Add contention detection for rwlocks")
Tested-by: Guenter Roeck <[e-mail]>
Reviewed-by: Ben Gardon <[e-mail]>
[Add arch/sparc and kernel/locking parts per discussion with Waiman. - Paolo]
Signed-off-by: Paolo Bonzini <[e-mail]>

arch/arm64/include/asm/spinlock.h

···
 #ifndef __ASM_SPINLOCK_H
 #define __ASM_SPINLOCK_H
 
-#include <asm/qrwlock.h>
 #include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
 
 /* See include/linux/spinlock.h */
 #define smp_mb__after_spinlock()	smp_mb()

arch/mips/include/asm/spinlock.h

···
 #define _ASM_SPINLOCK_H
 
 #include <asm/processor.h>
-#include <asm/qrwlock.h>
 
 #include <asm-generic/qspinlock_types.h>
 
···
 }
 
 #include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
 
 #endif /* _ASM_SPINLOCK_H */

arch/sparc/include/asm/spinlock_64.h

···
 
 #include <asm/processor.h>
 #include <asm/barrier.h>
-#include <asm/qrwlock.h>
 #include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
 
 #endif /* !(__ASSEMBLY__) */
 

arch/xtensa/include/asm/spinlock.h

···
 #define _XTENSA_SPINLOCK_H
 
 #include <asm/barrier.h>
-#include <asm/qrwlock.h>
 #include <asm/qspinlock.h>
+#include <asm/qrwlock.h>
 
 #define smp_mb__after_spinlock()	smp_mb()
 

include/asm-generic/qrwlock.h

···
 #include <asm/processor.h>
 
 #include <asm-generic/qrwlock_types.h>
-#include <asm-generic/qspinlock.h>
+
+/* Must be included from asm/spinlock.h after defining arch_spin_is_locked.  */
 
 /*
  * Writer states & reader shift and bias.

kernel/locking/qrwlock.c

···
 #include <linux/percpu.h>
 #include <linux/hardirq.h>
 #include <linux/spinlock.h>
-#include <asm/qrwlock.h>
 
 /**
  * queued_read_lock_slowpath - acquire read lock of a queue rwlock