x86: Inline the spin lock function family

Combined with LTO, this yields a consistent 5% boost to procfs I/O
performance right off the bat (as measured with callbench). The spin
lock functions constitute some of the hottest code paths in the kernel;
inlining them to improve performance makes sense.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>

arch/x86/Kconfig

@@ -296,6 +296,34 @@ config X86
 	select HAVE_ARCH_NODE_DEV_GROUP		if X86_SGX
 	select FUNCTION_ALIGNMENT_16B		if X86_64 || X86_ALIGNMENT_16
 	select FUNCTION_ALIGNMENT_4B
+	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
 	imply IMA_SECURE_AND_OR_TRUSTED_BOOT    if EFI
 	select HAVE_DYNAMIC_FTRACE_NO_PATCHABLE