[PATCH] genirq: rename desc->handler to desc->chip

This patch-queue improves the generic IRQ layer to be truly generic, by adding
various abstractions and features to it, without impacting existing
functionality.

While the queue can be best described as "fix and improve everything in the
generic IRQ layer that we could think of", and thus it consists of many
smaller features and lots of cleanups, the one feature that stands out most is
the new 'irq chip' abstraction.

The irq-chip abstraction is about describing and coding and IRQ controller
driver by mapping its raw hardware capabilities [and quirks, if needed] in a
straightforward way, without having to think about "IRQ flow"
(level/edge/etc.) type of details.

This stands in contrast with the current 'irq-type' model of genirq
architectures, which 'mixes' raw hardware capabilities with 'flow' details.
The patchset supports both types of irq controller designs at once, and
converts i386 and x86_64 to the new irq-chip design.

As a bonus side-effect of the irq-chip approach, chained interrupt controllers
(master/slave PIC constructs, etc.) are now supported by design as well.

The end result of this patchset intends to be simpler architecture-level code
and more consolidation between architectures.

We reused many bits of code and many concepts from Russell King's ARM IRQ
layer, the merging of which was one of the motivations for this patchset.

This patch:

rename desc->handler to desc->chip.

Originally i did not want to do this, because it's a big patch.  But having
both "desc->handler", "desc->handle_irq" and "action->handler" caused a
large degree of confusion and made the code appear alot less clean than it
truly is.

I have also attempted a dual approach as well by introducing a
desc->chip alias - but that just wasnt robust enough and broke
frequently.

So lets get over with this quickly.  The conversion was done automatically
via scripts and converts all the code in the kernel.

This renaming patch is the first one amongst the patches, so that the
remaining patches can stay flexible and can be merged and split up
without having some big monolithic patch act as a merge barrier.

[akpm@osdl.org: build fix]
[akpm@osdl.org: another build fix]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 4 insertions, 4 deletions

diff --git a/arch/sh/kernel/cpu/irq/imask.c b/arch/sh/kernel/cpu/irq/imask.c
index baed9a550d39..a33ae3e0a5a5 100644
--- a/arch/sh/kernel/cpu/irq/imask.c
+++ b/arch/sh/kernel/cpu/irq/imask.c
@@ -105,6 +105,6 @@ static void shutdown_imask_irq(unsigned int irq)
 void make_imask_irq(unsigned int irq)
 {
         disable_irq_nosync(irq);
-        irq_desc[irq].handler = &imask_irq_type;
+        irq_desc[irq].chip = &imask_irq_type;
         enable_irq(irq);
 }
diff --git a/arch/sh/kernel/cpu/irq/intc2.c b/arch/sh/kernel/cpu/irq/intc2.c
index 06e8afab32e4..30064bf6e154 100644
--- a/arch/sh/kernel/cpu/irq/intc2.c
+++ b/arch/sh/kernel/cpu/irq/intc2.c
@@ -137,7 +137,7 @@ void make_intc2_irq(unsigned int irq,
 
         local_irq_restore(flags);
 
-        irq_desc[irq].handler = &intc2_irq_type;
+        irq_desc[irq].chip = &intc2_irq_type;
 
         disable_intc2_irq(irq);
 }
diff --git a/arch/sh/kernel/cpu/irq/ipr.c b/arch/sh/kernel/cpu/irq/ipr.c
index e55150ed0856..0373b65c77f9 100644
--- a/arch/sh/kernel/cpu/irq/ipr.c
+++ b/arch/sh/kernel/cpu/irq/ipr.c
@@ -115,7 +115,7 @@ void make_ipr_irq(unsigned int irq, unsigned int addr, int pos, int priority)
         ipr_data[irq].shift = pos*4; /* POSition (0-3) x 4 means shift */
         ipr_data[irq].priority = priority;
 
-        irq_desc[irq].handler = &ipr_irq_type;
+        irq_desc[irq].chip = &ipr_irq_type;
         disable_ipr_irq(irq);
 }
 
diff --git a/arch/sh/kernel/cpu/irq/pint.c b/arch/sh/kernel/cpu/irq/pint.c
index 95d6024fe1ae..714963a25bba 100644
--- a/arch/sh/kernel/cpu/irq/pint.c
+++ b/arch/sh/kernel/cpu/irq/pint.c
@@ -85,7 +85,7 @@ static void end_pint_irq(unsigned int irq)
 void make_pint_irq(unsigned int irq)
 {
         disable_irq_nosync(irq);
-        irq_desc[irq].handler = &pint_irq_type;
+        irq_desc[irq].chip = &pint_irq_type;
         disable_pint_irq(irq);
 }