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 <benh@kernel.crashing.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 12 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 9ed4931af164..068377a2a8dc 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -173,7 +173,7 @@ void local_irq_restore(unsigned long en)
                 lv1_get_version_info(&tmp);
         }
 
-        hard_irq_enable();
+        __hard_irq_enable();
 }
 #endif /* CONFIG_PPC64 */
 
diff --git a/arch/powerpc/kernel/swsusp.c b/arch/powerpc/kernel/swsusp.c
index 064a7ba4f02c..77b7b34b5955 100644
--- a/arch/powerpc/kernel/swsusp.c
+++ b/arch/powerpc/kernel/swsusp.c
@@ -36,8 +36,4 @@ void restore_processor_state(void)
 #ifdef CONFIG_PPC32
         set_context(current->active_mm->context.id, current->active_mm->pgd);
 #endif
-
-#ifdef CONFIG_PPC64
-        hard_irq_enable();
-#endif
 }
diff --git a/arch/powerpc/platforms/cell/pervasive.c b/arch/powerpc/platforms/cell/pervasive.c
index 8c20f0fb8651..812bf563ed65 100644
--- a/arch/powerpc/platforms/cell/pervasive.c
+++ b/arch/powerpc/platforms/cell/pervasive.c
@@ -43,12 +43,10 @@ static void cbe_power_save(void)
         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);
 
diff --git a/include/asm-powerpc/hw_irq.h b/include/asm-powerpc/hw_irq.h
index 9e4dd98eb220..a7b60bf639e0 100644
--- a/include/asm-powerpc/hw_irq.h
+++ b/include/asm-powerpc/hw_irq.h
@@ -48,8 +48,15 @@ extern void iseries_handle_interrupts(void);
 
 #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