The patch titled
genirq: do not mask interrupts by default
has been added to the -mm tree. Its filename is
genirq-do-not-mask-interrupts-by-default.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: genirq: do not mask interrupts by default
From: Ingo Molnar <mingo@xxxxxxx>
Never mask interrupts immediately upon request. Disabling interrupts in
high-performance codepaths is rare, and on the other hand this change could
recover lost edges (or even other types of lost interrupts) by conservatively
only masking interrupts after they happen. (NOTE: with this change the
highlevel irq-disable code still soft-disables this IRQ line - and if such an
interrupt happens then the IRQ flow handler keeps the IRQ masked.)
Mark i8529A controllers as 'never loses an edge'.
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/i8259.c | 1 +
arch/x86_64/kernel/i8259.c | 1 +
kernel/irq/chip.c | 17 ++++++++++-------
3 files changed, 12 insertions(+), 7 deletions(-)
diff -puN arch/i386/kernel/i8259.c~genirq-do-not-mask-interrupts-by-default arch/i386/kernel/i8259.c
--- a/arch/i386/kernel/i8259.c~genirq-do-not-mask-interrupts-by-default
+++ a/arch/i386/kernel/i8259.c
@@ -41,6 +41,7 @@ static void mask_and_ack_8259A(unsigned
static struct irq_chip i8259A_chip = {
.name = "XT-PIC",
.mask = disable_8259A_irq,
+ .disable = disable_8259A_irq,
.unmask = enable_8259A_irq,
.mask_ack = mask_and_ack_8259A,
};
diff -puN arch/x86_64/kernel/i8259.c~genirq-do-not-mask-interrupts-by-default arch/x86_64/kernel/i8259.c
--- a/arch/x86_64/kernel/i8259.c~genirq-do-not-mask-interrupts-by-default
+++ a/arch/x86_64/kernel/i8259.c
@@ -103,6 +103,7 @@ static void mask_and_ack_8259A(unsigned
static struct irq_chip i8259A_chip = {
.name = "XT-PIC",
.mask = disable_8259A_irq,
+ .disable = disable_8259A_irq,
.unmask = enable_8259A_irq,
.mask_ack = mask_and_ack_8259A,
};
diff -puN kernel/irq/chip.c~genirq-do-not-mask-interrupts-by-default kernel/irq/chip.c
--- a/kernel/irq/chip.c~genirq-do-not-mask-interrupts-by-default
+++ a/kernel/irq/chip.c
@@ -202,10 +202,6 @@ static void default_enable(unsigned int
*/
static void default_disable(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
-
- if (!(desc->status & IRQ_DELAYED_DISABLE))
- desc->chip->mask(irq);
}
/*
@@ -270,13 +266,18 @@ handle_simple_irq(unsigned int irq, stru
if (unlikely(desc->status & IRQ_INPROGRESS))
goto out_unlock;
- desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
kstat_cpu(cpu).irqs[irq]++;
action = desc->action;
- if (unlikely(!action || (desc->status & IRQ_DISABLED)))
+ if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
+ if (desc->chip->mask)
+ desc->chip->mask(irq);
+ desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
+ desc->status |= IRQ_PENDING;
goto out_unlock;
+ }
+ desc->status &= ~(IRQ_REPLAY | IRQ_WAITING | IRQ_PENDING);
desc->status |= IRQ_INPROGRESS;
spin_unlock(&desc->lock);
@@ -368,11 +369,13 @@ handle_fasteoi_irq(unsigned int irq, str
/*
* If its disabled or no action available
- * keep it masked and get out of here
+ * then mask it and get out of here:
*/
action = desc->action;
if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
desc->status |= IRQ_PENDING;
+ if (desc->chip->mask)
+ desc->chip->mask(irq);
goto out;
}
_
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x86_64-ia32-vdso-use-install_special_mapping.patch
powerpc-vdso-use-install_special_mapping.patch
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fix-x86_64-mm-convert-i386-pda-code-to-use-%fs.patch
x86_64-do-not-enable-the-nmi-watchdog-by-default.patch
spin_lock_irq-enable-interrupts-while-spinning-preparatory-patch.patch
spin_lock_irq-enable-interrupts-while-spinning-x86_64-implementation.patch
spin_lock_irq-enable-interrupts-while-spinning-i386-implementation.patch
spin_lock_irq-enable-interrupts-while-spinning-i386-implementation-fix.patch
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i386-kwatch-kernel-watchpoints-using-cpu-debug-registers-fix.patch
cpuset-remove-sched-domain-hooks-from-cpusets.patch
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lockdep-more-unlock-on-error-fixes.patch
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clocksource-replace-is_continuous-by-a-flag-field.patch
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clocksource-fixup-is_continous-changes-on-arm.patch
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acpi-fix-missing-include-for-up.patch
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genirq-do-not-mask-interrupts-by-default.patch
genirq-remove-irq_disabled.patch
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