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>

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 9ed4931..068377a 100644 (file)
--- 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 064a7ba..77b7b34 100644 (file)
--- 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 8c20f0f..812bf56 100644 (file)
--- 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 9e4dd98..a7b60bf 100644 (file)
--- 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