powerpc: fixup hard_irq_disable semantics

This patch renames the raw hard_irq_{enable,disable} into
__hard_irq_{enable,disable} and introduces a higher level hard_irq_disable()
function that can be used by any code to enforce that IRQs are fully disabled,
not only lazy disabled.

The difference with the __ versions is that it will update some per-processor
fields so that the kernel keeps track and properly re-enables them in the next
local_irq_disable();

This prepares powerpc for my next patch that introduces hard_irq_disable()
generically.

Signed-off-by: Benjamin Herrenschmidt <[e-mail]>
Cc: Rusty Russell <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/powerpc/kernel/irq.c

···
 		lv1_get_version_info(&tmp);
 	}
 
-	hard_irq_enable();
+	__hard_irq_enable();
 }
 #endif /* CONFIG_PPC64 */
 

arch/powerpc/kernel/swsusp.c

···
 #ifdef CONFIG_PPC32
 	set_context(current->active_mm->context.id, current->active_mm->pgd);
 #endif
-
-#ifdef CONFIG_PPC64
-	hard_irq_enable();
-#endif
 }

arch/powerpc/platforms/cell/pervasive.c

···
 	unsigned long ctrl, thread_switch_control;
 
 	/*
-	 * We need to hard disable interrupts, but we also need to mark them
-	 * hard disabled in the PACA so that the local_irq_enable() done by
-	 * our caller upon return propertly hard enables.
+	 * We need to hard disable interrupts, the local_irq_enable() done by
+	 * our caller upon return will hard re-enable.
 	 */
 	hard_irq_disable();
-	get_paca()->hard_enabled = 0;
 
 	ctrl = mfspr(SPRN_CTRLF);
 

include/asm-powerpc/hw_irq.h

···
 
 #define irqs_disabled()		(local_get_flags() == 0)
 
-#define hard_irq_enable()	__mtmsrd(mfmsr() | MSR_EE, 1)
-#define hard_irq_disable()	__mtmsrd(mfmsr() & ~MSR_EE, 1)
+#define __hard_irq_enable()	__mtmsrd(mfmsr() | MSR_EE, 1)
+#define __hard_irq_disable()	__mtmsrd(mfmsr() & ~MSR_EE, 1)
+
+#define  hard_irq_disable()			\
+	do {					\
+		__hard_irq_disable();		\
+		get_paca()->soft_enabled = 0;	\
+		get_paca()->hard_enabled = 0;	\
+	} while(0)
 
 #else