locking: Make inlining decision Kconfig based

commit 892a7c67 (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 <tglx@linutronix.de>
LKML-Reference: <20091109151428.504477141@linutronix.de>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

1 files changed, 199 insertions, 0 deletions

diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
new file mode 100644
index 000000000000..d1f86db71451
--- /dev/null
+++ b/kernel/Kconfig.locks
@@ -0,0 +1,199 @@
+#
+# The ARCH_INLINE foo is necessary because select ignores "depends on"
+#
+config ARCH_INLINE_SPIN_TRYLOCK
+	bool
+
+config ARCH_INLINE_SPIN_TRYLOCK_BH
+	bool
+
+config ARCH_INLINE_SPIN_LOCK
+	bool
+
+config ARCH_INLINE_SPIN_LOCK_BH
+	bool
+
+config ARCH_INLINE_SPIN_LOCK_IRQ
+	bool
+
+config ARCH_INLINE_SPIN_LOCK_IRQSAVE
+	bool
+
+config ARCH_INLINE_SPIN_UNLOCK
+	bool
+
+config ARCH_INLINE_SPIN_UNLOCK_BH
+	bool
+
+config ARCH_INLINE_SPIN_UNLOCK_IRQ
+	bool
+
+config ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
+	bool
+
+
+config ARCH_INLINE_READ_TRYLOCK
+	bool
+
+config ARCH_INLINE_READ_LOCK
+	bool
+
+config ARCH_INLINE_READ_LOCK_BH
+	bool
+
+config ARCH_INLINE_READ_LOCK_IRQ
+	bool
+
+config ARCH_INLINE_READ_LOCK_IRQSAVE
+	bool
+
+config ARCH_INLINE_READ_UNLOCK
+	bool
+
+config ARCH_INLINE_READ_UNLOCK_BH
+	bool
+
+config ARCH_INLINE_READ_UNLOCK_IRQ
+	bool
+
+config ARCH_INLINE_READ_UNLOCK_IRQRESTORE
+	bool
+
+
+config ARCH_INLINE_WRITE_TRYLOCK
+	bool
+
+config ARCH_INLINE_WRITE_LOCK
+	bool
+
+config ARCH_INLINE_WRITE_LOCK_BH
+	bool
+
+config ARCH_INLINE_WRITE_LOCK_IRQ
+	bool
+
+config ARCH_INLINE_WRITE_LOCK_IRQSAVE
+	bool
+
+config ARCH_INLINE_WRITE_UNLOCK
+	bool
+
+config ARCH_INLINE_WRITE_UNLOCK_BH
+	bool
+
+config ARCH_INLINE_WRITE_UNLOCK_IRQ
+	bool
+
+config ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
+	bool
+
+#
+# lock_* functions are inlined when:
+#   - DEBUG_SPINLOCK=n and GENERIC_LOCKBREAK=n and ARCH_INLINE_*LOCK=y
+#
+# trylock_* functions are inlined when:
+#   - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
+#
+# unlock and unlock_irq functions are inlined when:
+#   - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
+#  or
+#   - DEBUG_SPINLOCK=n and PREEMPT=n
+#
+# unlock_bh and unlock_irqrestore functions are inlined when:
+#   - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
+#
+
+config INLINE_SPIN_TRYLOCK
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_TRYLOCK
+
+config INLINE_SPIN_TRYLOCK_BH
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_TRYLOCK_BH
+
+config INLINE_SPIN_LOCK
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && ARCH_INLINE_SPIN_LOCK
+
+config INLINE_SPIN_LOCK_BH
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_SPIN_LOCK_BH
+
+config INLINE_SPIN_LOCK_IRQ
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_SPIN_LOCK_IRQ
+
+config INLINE_SPIN_LOCK_IRQSAVE
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_SPIN_LOCK_IRQSAVE
+
+config INLINE_SPIN_UNLOCK
+	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_SPIN_UNLOCK)
+
+config INLINE_SPIN_UNLOCK_BH
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_UNLOCK_BH
+
+config INLINE_SPIN_UNLOCK_IRQ
+	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_SPIN_UNLOCK_BH)
+
+config INLINE_SPIN_UNLOCK_IRQRESTORE
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
+
+
+config INLINE_READ_TRYLOCK
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_READ_TRYLOCK
+
+config INLINE_READ_LOCK
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && ARCH_INLINE_READ_LOCK
+
+config INLINE_READ_LOCK_BH
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_READ_LOCK_BH
+
+config INLINE_READ_LOCK_IRQ
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_READ_LOCK_IRQ
+
+config INLINE_READ_LOCK_IRQSAVE
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_READ_LOCK_IRQSAVE
+
+config INLINE_READ_UNLOCK
+	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_READ_UNLOCK)
+
+config INLINE_READ_UNLOCK_BH
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_READ_UNLOCK_BH
+
+config INLINE_READ_UNLOCK_IRQ
+	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_READ_UNLOCK_BH)
+
+config INLINE_READ_UNLOCK_IRQRESTORE
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_READ_UNLOCK_IRQRESTORE
+
+
+config INLINE_WRITE_TRYLOCK
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_TRYLOCK
+
+config INLINE_WRITE_LOCK
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && ARCH_INLINE_WRITE_LOCK
+
+config INLINE_WRITE_LOCK_BH
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_WRITE_LOCK_BH
+
+config INLINE_WRITE_LOCK_IRQ
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_WRITE_LOCK_IRQ
+
+config INLINE_WRITE_LOCK_IRQSAVE
+	def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
+		 ARCH_INLINE_WRITE_LOCK_IRQSAVE
+
+config INLINE_WRITE_UNLOCK
+	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_WRITE_UNLOCK)
+
+config INLINE_WRITE_UNLOCK_BH
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_UNLOCK_BH
+
+config INLINE_WRITE_UNLOCK_IRQ
+	def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_WRITE_UNLOCK_BH)
+
+config INLINE_WRITE_UNLOCK_IRQRESTORE
+	def_bool !DEBUG_SPINLOCK && ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE