[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>

13 files changed, 15 insertions, 15 deletions

diff --git a/arch/sh/boards/adx/irq_maskreg.c b/arch/sh/boards/adx/irq_maskreg.c
index c0973f8..357fab1 100644
--- a/arch/sh/boards/adx/irq_maskreg.c
+++ b/arch/sh/boards/adx/irq_maskreg.c
@@ -102,6 +102,6 @@ static void end_maskreg_irq(unsigned int irq)
 void make_maskreg_irq(unsigned int irq)
 {
 	disable_irq_nosync(irq);
-	irq_desc[irq].handler = &maskreg_irq_type;
+	irq_desc[irq].chip = &maskreg_irq_type;
 	disable_maskreg_irq(irq);
 }
diff --git a/arch/sh/boards/bigsur/irq.c b/arch/sh/boards/bigsur/irq.c
index 6ddbcc7..1d32425 100644
--- a/arch/sh/boards/bigsur/irq.c
+++ b/arch/sh/boards/bigsur/irq.c
@@ -253,7 +253,7 @@ static void make_bigsur_l1isr(unsigned int irq) {
         /* sanity check first */
         if(irq >= BIGSUR_IRQ_LOW && irq < BIGSUR_IRQ_HIGH) {
                 /* save the handler in the main description table */
-                irq_desc[irq].handler = &bigsur_l1irq_type;
+                irq_desc[irq].chip = &bigsur_l1irq_type;
                 irq_desc[irq].status = IRQ_DISABLED;
                 irq_desc[irq].action = 0;
                 irq_desc[irq].depth = 1;
@@ -270,7 +270,7 @@ static void make_bigsur_l2isr(unsigned int irq) {
         /* sanity check first */
         if(irq >= BIGSUR_2NDLVL_IRQ_LOW && irq < BIGSUR_2NDLVL_IRQ_HIGH) {
                 /* save the handler in the main description table */
-                irq_desc[irq].handler = &bigsur_l2irq_type;
+                irq_desc[irq].chip = &bigsur_l2irq_type;
                 irq_desc[irq].status = IRQ_DISABLED;
                 irq_desc[irq].action = 0;
                 irq_desc[irq].depth = 1;
diff --git a/arch/sh/boards/cqreek/irq.c b/arch/sh/boards/cqreek/irq.c
index d1da0d8..2955adc 100644
--- a/arch/sh/boards/cqreek/irq.c
+++ b/arch/sh/boards/cqreek/irq.c
@@ -103,7 +103,7 @@ void __init init_cqreek_IRQ(void)
 		cqreek_irq_data[14].stat_port = BRIDGE_IDE_INTR_STAT;
 		cqreek_irq_data[14].bit = 1;
 
-		irq_desc[14].handler = &cqreek_irq_type;
+		irq_desc[14].chip = &cqreek_irq_type;
 		irq_desc[14].status = IRQ_DISABLED;
 		irq_desc[14].action = 0;
 		irq_desc[14].depth = 1;
@@ -117,7 +117,7 @@ void __init init_cqreek_IRQ(void)
 		cqreek_irq_data[10].bit = (1 << 10);
 
 		/* XXX: Err... we may need demultiplexer for ISA irq... */
-		irq_desc[10].handler = &cqreek_irq_type;
+		irq_desc[10].chip = &cqreek_irq_type;
 		irq_desc[10].status = IRQ_DISABLED;
 		irq_desc[10].action = 0;
 		irq_desc[10].depth = 1;
diff --git a/arch/sh/boards/dreamcast/setup.c b/arch/sh/boards/dreamcast/setup.c
index 55dece3..0027b80 100644
--- a/arch/sh/boards/dreamcast/setup.c
+++ b/arch/sh/boards/dreamcast/setup.c
@@ -70,7 +70,7 @@ int __init platform_setup(void)
 
 	/* Assign all virtual IRQs to the System ASIC int. handler */
 	for (i = HW_EVENT_IRQ_BASE; i < HW_EVENT_IRQ_MAX; i++)
-		irq_desc[i].handler = &systemasic_int;
+		irq_desc[i].chip = &systemasic_int;
 
 	board_time_init = aica_time_init;
 
diff --git a/arch/sh/boards/ec3104/setup.c b/arch/sh/boards/ec3104/setup.c
index 5130ba2..4b3ef16 100644
--- a/arch/sh/boards/ec3104/setup.c
+++ b/arch/sh/boards/ec3104/setup.c
@@ -63,7 +63,7 @@ int __init platform_setup(void)
 		str[i] = ctrl_readb(EC3104_BASE + i);
 
 	for (i = EC3104_IRQBASE; i < EC3104_IRQBASE + 32; i++)
-		irq_desc[i].handler = &ec3104_int;
+		irq_desc[i].chip = &ec3104_int;
 
 	printk("initializing EC3104 \"%.8s\" at %08x, IRQ %d, IRQ base %d\n",
 	       str, EC3104_BASE, EC3104_IRQ, EC3104_IRQBASE);
diff --git a/arch/sh/boards/harp/irq.c b/arch/sh/boards/harp/irq.c
index 52d0ba3..701fa55 100644
--- a/arch/sh/boards/harp/irq.c
+++ b/arch/sh/boards/harp/irq.c
@@ -114,7 +114,7 @@ static void enable_harp_irq(unsigned int irq)
 static void __init make_harp_irq(unsigned int irq)
 {
 	disable_irq_nosync(irq);
-	irq_desc[irq].handler = &harp_irq_type;
+	irq_desc[irq].chip = &harp_irq_type;
 	disable_harp_irq(irq);
 }
 
diff --git a/arch/sh/boards/mpc1211/setup.c b/arch/sh/boards/mpc1211/setup.c
index 2bb581b..b72f009 100644
--- a/arch/sh/boards/mpc1211/setup.c
+++ b/arch/sh/boards/mpc1211/setup.c
@@ -194,7 +194,7 @@ static struct hw_interrupt_type mpc1211_irq_type = {
 
 static void make_mpc1211_irq(unsigned int irq)
 {
-	irq_desc[irq].handler = &mpc1211_irq_type;
+	irq_desc[irq].chip = &mpc1211_irq_type;
 	irq_desc[irq].status  = IRQ_DISABLED;
 	irq_desc[irq].action  = 0;
 	irq_desc[irq].depth   = 1;
diff --git a/arch/sh/boards/overdrive/irq.c b/arch/sh/boards/overdrive/irq.c
index 715e8fe..2c13a7d 100644
--- a/arch/sh/boards/overdrive/irq.c
+++ b/arch/sh/boards/overdrive/irq.c
@@ -150,7 +150,7 @@ static void enable_od_irq(unsigned int irq)
 static void __init make_od_irq(unsigned int irq)
 {
 	disable_irq_nosync(irq);
-	irq_desc[irq].handler = &od_irq_type;
+	irq_desc[irq].chip = &od_irq_type;
 	disable_od_irq(irq);
 }
 
diff --git a/arch/sh/boards/renesas/hs7751rvoip/irq.c b/arch/sh/boards/renesas/hs7751rvoip/irq.c
index ed4c5b5..52a98b5 100644
--- a/arch/sh/boards/renesas/hs7751rvoip/irq.c
+++ b/arch/sh/boards/renesas/hs7751rvoip/irq.c
@@ -86,7 +86,7 @@ static struct hw_interrupt_type hs7751rvoip_irq_type = {
 static void make_hs7751rvoip_irq(unsigned int irq)
 {
 	disable_irq_nosync(irq);
-	irq_desc[irq].handler = &hs7751rvoip_irq_type;
+	irq_desc[irq].chip = &hs7751rvoip_irq_type;
 	disable_hs7751rvoip_irq(irq);
 }
 
diff --git a/arch/sh/boards/renesas/rts7751r2d/irq.c b/arch/sh/boards/renesas/rts7751r2d/irq.c
index d36c937..e16915d 100644
--- a/arch/sh/boards/renesas/rts7751r2d/irq.c
+++ b/arch/sh/boards/renesas/rts7751r2d/irq.c
@@ -100,7 +100,7 @@ static struct hw_interrupt_type rts7751r2d_irq_type = {
 static void make_rts7751r2d_irq(unsigned int irq)
 {
 	disable_irq_nosync(irq);
-	irq_desc[irq].handler = &rts7751r2d_irq_type;
+	irq_desc[irq].chip = &rts7751r2d_irq_type;
 	disable_rts7751r2d_irq(irq);
 }
 
diff --git a/arch/sh/boards/renesas/systemh/irq.c b/arch/sh/boards/renesas/systemh/irq.c
index 7a2eb10..8459791 100644
--- a/arch/sh/boards/renesas/systemh/irq.c
+++ b/arch/sh/boards/renesas/systemh/irq.c
@@ -105,7 +105,7 @@ static void end_systemh_irq(unsigned int irq)
 void make_systemh_irq(unsigned int irq)
 {
 	disable_irq_nosync(irq);
-	irq_desc[irq].handler = &systemh_irq_type;
+	irq_desc[irq].chip = &systemh_irq_type;
 	disable_systemh_irq(irq);
 }
 
diff --git a/arch/sh/boards/se/73180/irq.c b/arch/sh/boards/se/73180/irq.c
index 70f04ca..402735c 100644
--- a/arch/sh/boards/se/73180/irq.c
+++ b/arch/sh/boards/se/73180/irq.c
@@ -85,7 +85,7 @@ void
 make_intreq_irq(unsigned int irq)
 {
 	disable_irq_nosync(irq);
-	irq_desc[irq].handler = &intreq_irq_type;
+	irq_desc[irq].chip = &intreq_irq_type;
 	disable_intreq_irq(irq);
 }
 
diff --git a/arch/sh/boards/superh/microdev/irq.c b/arch/sh/boards/superh/microdev/irq.c
index efcbd86..cb59994 100644
--- a/arch/sh/boards/superh/microdev/irq.c
+++ b/arch/sh/boards/superh/microdev/irq.c
@@ -147,7 +147,7 @@ static void enable_microdev_irq(unsigned int irq)
 static void __init make_microdev_irq(unsigned int irq)
 {
 	disable_irq_nosync(irq);
-	irq_desc[irq].handler = &microdev_irq_type;
+	irq_desc[irq].chip = &microdev_irq_type;
 	disable_microdev_irq(irq);
 }