locking: Make inlining decision Kconfig based

commit 892a7c6 (locking: Allow arch-inlined spinlocks) implements the
selection of which lock functions are inlined based on defines in
arch/.../spinlock.h: #define __always_inline__LOCK_FUNCTION

Despite of the name __always_inline__* the lock functions can be built
out of line depending on config options. Also if the arch does not set
some inline defines the generic code might set them; again depending on
config options.

This makes it unnecessary hard to figure out when and which lock
functions are inlined. Aside of that it makes it way harder and
messier for -rt to manipulate the lock functions.

Convert the inlining decision to CONFIG switches. Each lock function
is inlined depending on CONFIG_INLINE_*. The configs implement the
existing dependencies. The architecture code can select ARCH_INLINE_*
to signal that it wants the corresponding lock function inlined.
ARCH_INLINE_* is necessary as Kconfig ignores "depends on"
restrictions when a config element is selected.

No functional change.

Signed-off-by: Thomas Gleixner <[email protected]>
LKML-Reference: <[email protected]>
Acked-by: Heiko Carstens <[email protected]>
Reviewed-by: Ingo Molnar <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>

Author: KAGA-KOKO

arch/s390/Kconfig

@@ -95,6 +95,34 @@ config S390
 	select HAVE_ARCH_TRACEHOOK
 	select INIT_ALL_POSSIBLE
 	select HAVE_PERF_EVENTS
+	select ARCH_INLINE_SPIN_TRYLOCK
+	select ARCH_INLINE_SPIN_TRYLOCK_BH
+	select ARCH_INLINE_SPIN_LOCK
+	select ARCH_INLINE_SPIN_LOCK_BH
+	select ARCH_INLINE_SPIN_LOCK_IRQ
+	select ARCH_INLINE_SPIN_LOCK_IRQSAVE
+	select ARCH_INLINE_SPIN_UNLOCK
+	select ARCH_INLINE_SPIN_UNLOCK_BH
+	select ARCH_INLINE_SPIN_UNLOCK_IRQ
+	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
+	select ARCH_INLINE_READ_TRYLOCK
+	select ARCH_INLINE_READ_LOCK
+	select ARCH_INLINE_READ_LOCK_BH
+	select ARCH_INLINE_READ_LOCK_IRQ
+	select ARCH_INLINE_READ_LOCK_IRQSAVE
+	select ARCH_INLINE_READ_UNLOCK
+	select ARCH_INLINE_READ_UNLOCK_BH
+	select ARCH_INLINE_READ_UNLOCK_IRQ
+	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
+	select ARCH_INLINE_WRITE_TRYLOCK
+	select ARCH_INLINE_WRITE_LOCK
+	select ARCH_INLINE_WRITE_LOCK_BH
+	select ARCH_INLINE_WRITE_LOCK_IRQ
+	select ARCH_INLINE_WRITE_LOCK_IRQSAVE
+	select ARCH_INLINE_WRITE_UNLOCK
+	select ARCH_INLINE_WRITE_UNLOCK_BH
+	select ARCH_INLINE_WRITE_UNLOCK_IRQ
+	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 
 config SCHED_OMIT_FRAME_POINTER
 	bool

arch/s390/include/asm/spinlock.h

@@ -191,33 +191,4 @@ static inline int __raw_write_trylock(raw_rwlock_t *rw)
 #define _raw_read_relax(lock)	cpu_relax()
 #define _raw_write_relax(lock)	cpu_relax()
 
-#define __always_inline__spin_lock
-#define __always_inline__read_lock
-#define __always_inline__write_lock
-#define __always_inline__spin_lock_bh
-#define __always_inline__read_lock_bh
-#define __always_inline__write_lock_bh
-#define __always_inline__spin_lock_irq
-#define __always_inline__read_lock_irq
-#define __always_inline__write_lock_irq
-#define __always_inline__spin_lock_irqsave
-#define __always_inline__read_lock_irqsave
-#define __always_inline__write_lock_irqsave
-#define __always_inline__spin_trylock
-#define __always_inline__read_trylock
-#define __always_inline__write_trylock
-#define __always_inline__spin_trylock_bh
-#define __always_inline__spin_unlock
-#define __always_inline__read_unlock
-#define __always_inline__write_unlock
-#define __always_inline__spin_unlock_bh
-#define __always_inline__read_unlock_bh
-#define __always_inline__write_unlock_bh
-#define __always_inline__spin_unlock_irq
-#define __always_inline__read_unlock_irq
-#define __always_inline__write_unlock_irq
-#define __always_inline__spin_unlock_irqrestore
-#define __always_inline__read_unlock_irqrestore
-#define __always_inline__write_unlock_irqrestore
-
 #endif /* __ASM_SPINLOCK_H */

include/linux/spinlock_api_smp.h

@@ -60,137 +60,118 @@ void __lockfunc _read_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
 void __lockfunc _write_unlock_irqrestore(rwlock_t *lock, unsigned long flags)
 							__releases(lock);
 
-/*
- * We inline the unlock functions in the nondebug case:
- */
-#if !defined(CONFIG_DEBUG_SPINLOCK) && !defined(CONFIG_PREEMPT)
-#define __always_inline__spin_unlock
-#define __always_inline__read_unlock
-#define __always_inline__write_unlock
-#define __always_inline__spin_unlock_irq
-#define __always_inline__read_unlock_irq
-#define __always_inline__write_unlock_irq
-#endif
-
-#ifndef CONFIG_DEBUG_SPINLOCK
-#ifndef CONFIG_GENERIC_LOCKBREAK
-
-#ifdef __always_inline__spin_lock
+#ifdef CONFIG_INLINE_SPIN_LOCK
 #define _spin_lock(lock) __spin_lock(lock)
 #endif
 
-#ifdef __always_inline__read_lock
+#ifdef CONFIG_INLINE_READ_LOCK
 #define _read_lock(lock) __read_lock(lock)
 #endif
 
-#ifdef __always_inline__write_lock
+#ifdef CONFIG_INLINE_WRITE_LOCK
 #define _write_lock(lock) __write_lock(lock)
 #endif
 
-#ifdef __always_inline__spin_lock_bh
+#ifdef CONFIG_INLINE_SPIN_LOCK_BH
 #define _spin_lock_bh(lock) __spin_lock_bh(lock)
 #endif
 
-#ifdef __always_inline__read_lock_bh
+#ifdef CONFIG_INLINE_READ_LOCK_BH
 #define _read_lock_bh(lock) __read_lock_bh(lock)
 #endif
 
-#ifdef __always_inline__write_lock_bh
+#ifdef CONFIG_INLINE_WRITE_LOCK_BH
 #define _write_lock_bh(lock) __write_lock_bh(lock)
 #endif
 
-#ifdef __always_inline__spin_lock_irq
+#ifdef CONFIG_INLINE_SPIN_LOCK_IRQ
 #define _spin_lock_irq(lock) __spin_lock_irq(lock)
 #endif
 
-#ifdef __always_inline__read_lock_irq
+#ifdef CONFIG_INLINE_READ_LOCK_IRQ
 #define _read_lock_irq(lock) __read_lock_irq(lock)
 #endif
 
-#ifdef __always_inline__write_lock_irq
+#ifdef CONFIG_INLINE_WRITE_LOCK_IRQ
 #define _write_lock_irq(lock) __write_lock_irq(lock)
 #endif
 
-#ifdef __always_inline__spin_lock_irqsave
+#ifdef CONFIG_INLINE_SPIN_LOCK_IRQSAVE
 #define _spin_lock_irqsave(lock) __spin_lock_irqsave(lock)
 #endif
 
-#ifdef __always_inline__read_lock_irqsave
+#ifdef CONFIG_INLINE_READ_LOCK_IRQSAVE
 #define _read_lock_irqsave(lock) __read_lock_irqsave(lock)
 #endif
 
-#ifdef __always_inline__write_lock_irqsave
+#ifdef CONFIG_INLINE_WRITE_LOCK_IRQSAVE
 #define _write_lock_irqsave(lock) __write_lock_irqsave(lock)
 #endif
 
-#endif /* !CONFIG_GENERIC_LOCKBREAK */
-
-#ifdef __always_inline__spin_trylock
+#ifdef CONFIG_INLINE_SPIN_TRYLOCK
 #define _spin_trylock(lock) __spin_trylock(lock)
 #endif
 
-#ifdef __always_inline__read_trylock
+#ifdef CONFIG_INLINE_READ_TRYLOCK
 #define _read_trylock(lock) __read_trylock(lock)
 #endif
 
-#ifdef __always_inline__write_trylock
+#ifdef CONFIG_INLINE_WRITE_TRYLOCK
 #define _write_trylock(lock) __write_trylock(lock)
 #endif
 
-#ifdef __always_inline__spin_trylock_bh
+#ifdef CONFIG_INLINE_SPIN_TRYLOCK_BH
 #define _spin_trylock_bh(lock) __spin_trylock_bh(lock)
 #endif
 
-#ifdef __always_inline__spin_unlock
+#ifdef CONFIG_INLINE_SPIN_UNLOCK
 #define _spin_unlock(lock) __spin_unlock(lock)
 #endif
 
-#ifdef __always_inline__read_unlock
+#ifdef CONFIG_INLINE_READ_UNLOCK
 #define _read_unlock(lock) __read_unlock(lock)
 #endif
 
-#ifdef __always_inline__write_unlock
+#ifdef CONFIG_INLINE_WRITE_UNLOCK
 #define _write_unlock(lock) __write_unlock(lock)
 #endif
 
-#ifdef __always_inline__spin_unlock_bh
+#ifdef CONFIG_INLINE_SPIN_UNLOCK_BH
 #define _spin_unlock_bh(lock) __spin_unlock_bh(lock)
 #endif
 
-#ifdef __always_inline__read_unlock_bh
+#ifdef CONFIG_INLINE_READ_UNLOCK_BH
 #define _read_unlock_bh(lock) __read_unlock_bh(lock)
 #endif
 
-#ifdef __always_inline__write_unlock_bh
+#ifdef CONFIG_INLINE_WRITE_UNLOCK_BH
 #define _write_unlock_bh(lock) __write_unlock_bh(lock)
 #endif
 
-#ifdef __always_inline__spin_unlock_irq
+#ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQ
 #define _spin_unlock_irq(lock) __spin_unlock_irq(lock)
 #endif
 
-#ifdef __always_inline__read_unlock_irq
+#ifdef CONFIG_INLINE_READ_UNLOCK_IRQ
 #define _read_unlock_irq(lock) __read_unlock_irq(lock)
 #endif
 
-#ifdef __always_inline__write_unlock_irq
+#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQ
 #define _write_unlock_irq(lock) __write_unlock_irq(lock)
 #endif
 
-#ifdef __always_inline__spin_unlock_irqrestore
+#ifdef CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE
 #define _spin_unlock_irqrestore(lock, flags) __spin_unlock_irqrestore(lock, flags)
 #endif
 
-#ifdef __always_inline__read_unlock_irqrestore
+#ifdef CONFIG_INLINE_READ_UNLOCK_IRQRESTORE
 #define _read_unlock_irqrestore(lock, flags) __read_unlock_irqrestore(lock, flags)
 #endif
 
-#ifdef __always_inline__write_unlock_irqrestore
+#ifdef CONFIG_INLINE_WRITE_UNLOCK_IRQRESTORE
 #define _write_unlock_irqrestore(lock, flags) __write_unlock_irqrestore(lock, flags)
 #endif
 
-#endif /* CONFIG_DEBUG_SPINLOCK */
-
 static inline int __spin_trylock(spinlock_t *lock)
 {
 	preempt_disable();

init/Kconfig

@@ -1210,3 +1210,4 @@ source "block/Kconfig"
 config PREEMPT_NOTIFIERS
 	bool
 
+source "kernel/Kconfig.locks"