提交 e1fa2e13 编写于 作者: B Benjamin Herrenschmidt 提交者: Linus Torvalds

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: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 2acdb169
......@@ -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 */
......
......@@ -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
}
......@@ -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);
......
......@@ -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
......
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