[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>

12 files changed, 16 insertions, 16 deletions

diff --git a/arch/ppc/syslib/cpc700_pic.c b/arch/ppc/syslib/cpc700_pic.c
index 5add0a919ef..172aa215fdb 100644
--- a/arch/ppc/syslib/cpc700_pic.c
+++ b/arch/ppc/syslib/cpc700_pic.c
@@ -140,12 +140,12 @@ cpc700_init_IRQ(void)
 						        /* IRQ 0 is highest */
 
 	for (i = 0; i < 17; i++) {
-		irq_desc[i].handler = &cpc700_pic;
+		irq_desc[i].chip = &cpc700_pic;
 		cpc700_pic_init_irq(i);
 	}
 
 	for (i = 20; i < 32; i++) {
-		irq_desc[i].handler = &cpc700_pic;
+		irq_desc[i].chip = &cpc700_pic;
 		cpc700_pic_init_irq(i);
 	}
 
diff --git a/arch/ppc/syslib/cpm2_pic.c b/arch/ppc/syslib/cpm2_pic.c
index 29d95d415ce..c0fee0beb81 100644
--- a/arch/ppc/syslib/cpm2_pic.c
+++ b/arch/ppc/syslib/cpm2_pic.c
@@ -171,7 +171,7 @@ void cpm2_init_IRQ(void)
 	/* Enable chaining to OpenPIC, and make everything level
 	 */
 	for (i = 0; i < NR_CPM_INTS; i++) {
-		irq_desc[i+CPM_IRQ_OFFSET].handler = &cpm2_pic;
+		irq_desc[i+CPM_IRQ_OFFSET].chip = &cpm2_pic;
 		irq_desc[i+CPM_IRQ_OFFSET].status |= IRQ_LEVEL;
 	}
 }
diff --git a/arch/ppc/syslib/gt64260_pic.c b/arch/ppc/syslib/gt64260_pic.c
index dc3bd9ecbbf..91096b38ae7 100644
--- a/arch/ppc/syslib/gt64260_pic.c
+++ b/arch/ppc/syslib/gt64260_pic.c
@@ -98,7 +98,7 @@ gt64260_init_irq(void)
 
 	/* use the gt64260 for all (possible) interrupt sources */
 	for (i = gt64260_irq_base; i < (gt64260_irq_base + 96); i++)
-		irq_desc[i].handler = &gt64260_pic;
+		irq_desc[i].chip = &gt64260_pic;
 
 	if (ppc_md.progress)
 		ppc_md.progress("gt64260_init_irq: exit", 0x0);
diff --git a/arch/ppc/syslib/m82xx_pci.c b/arch/ppc/syslib/m82xx_pci.c
index 1941a8c7ca9..63fa5b31339 100644
--- a/arch/ppc/syslib/m82xx_pci.c
+++ b/arch/ppc/syslib/m82xx_pci.c
@@ -159,7 +159,7 @@ pq2pci_init_irq(void)
 	immap->im_memctl.memc_or8 = 0xffff8010;
 #endif
 	for (irq = NR_CPM_INTS; irq < NR_CPM_INTS + 4; irq++)
-		irq_desc[irq].handler = &pq2pci_ic;
+		irq_desc[irq].chip = &pq2pci_ic;
 
 	/* make PCI IRQ level sensitive */
 	immap->im_intctl.ic_siexr &=
diff --git a/arch/ppc/syslib/m8xx_setup.c b/arch/ppc/syslib/m8xx_setup.c
index dae9af78bde..0c4c0de7c59 100644
--- a/arch/ppc/syslib/m8xx_setup.c
+++ b/arch/ppc/syslib/m8xx_setup.c
@@ -347,13 +347,13 @@ m8xx_init_IRQ(void)
 	int i;
 
 	for (i = SIU_IRQ_OFFSET ; i < SIU_IRQ_OFFSET + NR_SIU_INTS ; i++)
-		irq_desc[i].handler = &ppc8xx_pic;
+		irq_desc[i].chip = &ppc8xx_pic;
 
 	cpm_interrupt_init();
 
 #if defined(CONFIG_PCI)
 	for (i = I8259_IRQ_OFFSET ; i < I8259_IRQ_OFFSET + NR_8259_INTS ; i++)
-		irq_desc[i].handler = &i8259_pic;
+		irq_desc[i].chip = &i8259_pic;
 
 	i8259_pic_irq_offset = I8259_IRQ_OFFSET;
 	i8259_init(0);
diff --git a/arch/ppc/syslib/mpc52xx_pic.c b/arch/ppc/syslib/mpc52xx_pic.c
index c4406f9dc6a..6425b5cee7d 100644
--- a/arch/ppc/syslib/mpc52xx_pic.c
+++ b/arch/ppc/syslib/mpc52xx_pic.c
@@ -204,9 +204,9 @@ mpc52xx_init_irq(void)
 	out_be32(&intr->main_pri1, 0);
 	out_be32(&intr->main_pri2, 0);
 
-	/* Initialize irq_desc[i].handler's with mpc52xx_ic. */
+	/* Initialize irq_desc[i].chip's with mpc52xx_ic. */
 	for (i = 0; i < NR_IRQS; i++) {
-		irq_desc[i].handler = &mpc52xx_ic;
+		irq_desc[i].chip = &mpc52xx_ic;
 		irq_desc[i].status = IRQ_LEVEL;
 	}
 
diff --git a/arch/ppc/syslib/mv64360_pic.c b/arch/ppc/syslib/mv64360_pic.c
index 5a19697060f..a4244d46838 100644
--- a/arch/ppc/syslib/mv64360_pic.c
+++ b/arch/ppc/syslib/mv64360_pic.c
@@ -119,7 +119,7 @@ mv64360_init_irq(void)
 	/* All interrupts are level interrupts */
 	for (i = mv64360_irq_base; i < (mv64360_irq_base + 96); i++) {
 		irq_desc[i].status |= IRQ_LEVEL;
-		irq_desc[i].handler = &mv64360_pic;
+		irq_desc[i].chip = &mv64360_pic;
 	}
 
 	if (ppc_md.progress)
diff --git a/arch/ppc/syslib/open_pic.c b/arch/ppc/syslib/open_pic.c
index 70456c8f998..822058c2983 100644
--- a/arch/ppc/syslib/open_pic.c
+++ b/arch/ppc/syslib/open_pic.c
@@ -373,7 +373,7 @@ void __init openpic_init(int offset)
 				OPENPIC_VEC_IPI+i+offset);
 		/* IPIs are per-CPU */
 		irq_desc[OPENPIC_VEC_IPI+i+offset].status |= IRQ_PER_CPU;
-		irq_desc[OPENPIC_VEC_IPI+i+offset].handler = &open_pic_ipi;
+		irq_desc[OPENPIC_VEC_IPI+i+offset].chip = &open_pic_ipi;
 	}
 #endif
 
@@ -408,7 +408,7 @@ void __init openpic_init(int offset)
 
 	/* Init descriptors */
 	for (i = offset; i < NumSources + offset; i++)
-		irq_desc[i].handler = &open_pic;
+		irq_desc[i].chip = &open_pic;
 
 	/* Initialize the spurious interrupt */
 	if (ppc_md.progress) ppc_md.progress("openpic: spurious",0x3bd);
diff --git a/arch/ppc/syslib/open_pic2.c b/arch/ppc/syslib/open_pic2.c
index bcbe40de26f..b8154efff6e 100644
--- a/arch/ppc/syslib/open_pic2.c
+++ b/arch/ppc/syslib/open_pic2.c
@@ -290,7 +290,7 @@ void __init openpic2_init(int offset)
 
 	/* Init descriptors */
 	for (i = offset; i < NumSources + offset; i++)
-		irq_desc[i].handler = &open_pic2;
+		irq_desc[i].chip = &open_pic2;
 
 	/* Initialize the spurious interrupt */
 	if (ppc_md.progress) ppc_md.progress("openpic2: spurious",0x3bd);
diff --git a/arch/ppc/syslib/ppc403_pic.c b/arch/ppc/syslib/ppc403_pic.c
index c46043c4722..1584c8b1229 100644
--- a/arch/ppc/syslib/ppc403_pic.c
+++ b/arch/ppc/syslib/ppc403_pic.c
@@ -121,5 +121,5 @@ ppc4xx_pic_init(void)
 	ppc_md.get_irq = ppc403_pic_get_irq;
 
 	for (i = 0; i < NR_IRQS; i++)
-		irq_desc[i].handler = &ppc403_aic;
+		irq_desc[i].chip = &ppc403_aic;
 }
diff --git a/arch/ppc/syslib/ppc4xx_pic.c b/arch/ppc/syslib/ppc4xx_pic.c
index fd9af0fc0e9..e669c1335d4 100644
--- a/arch/ppc/syslib/ppc4xx_pic.c
+++ b/arch/ppc/syslib/ppc4xx_pic.c
@@ -276,7 +276,7 @@ void __init ppc4xx_pic_init(void)
 
 	/* Attach low-level handlers */
 	for (i = 0; i < (NR_UICS << 5); ++i) {
-		irq_desc[i].handler = &__uic[i >> 5].decl;
+		irq_desc[i].chip = &__uic[i >> 5].decl;
 		if (is_level_sensitive(i))
 			irq_desc[i].status |= IRQ_LEVEL;
 	}
diff --git a/arch/ppc/syslib/xilinx_pic.c b/arch/ppc/syslib/xilinx_pic.c
index e672b600f31..39a93dc6375 100644
--- a/arch/ppc/syslib/xilinx_pic.c
+++ b/arch/ppc/syslib/xilinx_pic.c
@@ -143,7 +143,7 @@ ppc4xx_pic_init(void)
 	ppc_md.get_irq = xilinx_pic_get_irq;
 
 	for (i = 0; i < NR_IRQS; ++i) {
-		irq_desc[i].handler = &xilinx_intc;
+		irq_desc[i].chip = &xilinx_intc;
 
 		if (XPAR_INTC_0_KIND_OF_INTR & (0x00000001 << i))
 			irq_desc[i].status &= ~IRQ_LEVEL;