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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>
This commit is contained in:
Benjamin Herrenschmidt 2007-05-10 22:22:45 -07:00 committed by Linus Torvalds
parent 2acdb16944
commit e1fa2e136f
4 changed files with 12 additions and 11 deletions
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2
arch/powerpc/kernel/irq.c
View File

@ -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 */

4
arch/powerpc/kernel/swsusp.c
View File

@ -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
}

6
arch/powerpc/platforms/cell/pervasive.c
View File

@ -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);

11
include/asm-powerpc/hw_irq.h
View File

@ -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