[RFC PATCH v2 18/25] smp, sparc64: kill SMP single function call interrupt

[Jiang Liu <liuj97@gmail.com>]

From: Jiang Liu <jiang.liu@huawei.com>

Commit 9a46ad6d6df3b54 "smp: make smp_call_function_many() use logic
similar to smp_call_function_single()" has unified the way to handle
single and multiple cross-CPU function calls. Now only one interrupt
is needed for architecture specific code to support generic SMP function
call interfaces, so kill the redundant single function call interrupt.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Jiang Liu <liuj97@gmail.com>
---
 arch/sparc/include/asm/pil.h  |  5 ++---
 arch/sparc/kernel/smp_64.c    | 11 +----------
 arch/sparc/kernel/ttable_64.S | 12 ++++--------
 arch/sparc/mm/ultra.S         |  5 -----
 4 files changed, 7 insertions(+), 26 deletions(-)

diff --git a/arch/sparc/include/asm/pil.h b/arch/sparc/include/asm/pil.h
index 2669370..5ffb15d 100644
--- a/arch/sparc/include/asm/pil.h
+++ b/arch/sparc/include/asm/pil.h
@@ -22,9 +22,8 @@
 #define PIL_SMP_CAPTURE		3
 #define PIL_SMP_CTX_NEW_VERSION	4
 #define PIL_DEVICE_IRQ		5
-#define PIL_SMP_CALL_FUNC_SNGL	6
-#define PIL_DEFERRED_PCR_WORK	7
-#define PIL_KGDB_CAPTURE	8
+#define PIL_DEFERRED_PCR_WORK	6
+#define PIL_KGDB_CAPTURE	7
 #define PIL_NORMAL_MAX		14
 #define PIL_NMI			15
 
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index e142545..65338c4 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -811,12 +811,9 @@ void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 	xcall_deliver((u64) &xcall_call_function, 0, 0, mask);
 }
 
-extern unsigned long xcall_call_function_single;
-
 void arch_send_call_function_single_ipi(int cpu)
 {
-	xcall_deliver((u64) &xcall_call_function_single, 0, 0,
-		      cpumask_of(cpu));
+	xcall_deliver((u64) &xcall_call_function, 0, 0, cpumask_of(cpu));
 }
 
 void __irq_entry smp_call_function_client(int irq, struct pt_regs *regs)
@@ -825,12 +822,6 @@ void __irq_entry smp_call_function_client(int irq, struct pt_regs *regs)
 	generic_smp_call_function_interrupt();
 }
 
-void __irq_entry smp_call_function_single_client(int irq, struct pt_regs *regs)
-{
-	clear_softint(1 << irq);
-	generic_smp_call_function_single_interrupt();
-}
-
 static void tsb_sync(void *info)
 {
 	struct trap_per_cpu *tp = &trap_block[raw_smp_processor_id()];
diff --git a/arch/sparc/kernel/ttable_64.S b/arch/sparc/kernel/ttable_64.S
index c6dfdaa..defa2db 100644
--- a/arch/sparc/kernel/ttable_64.S
+++ b/arch/sparc/kernel/ttable_64.S
@@ -58,17 +58,13 @@ tl0_irq3:	BTRAP(0x43)
 tl0_irq4:	BTRAP(0x44)
 #endif
 tl0_irq5:	TRAP_IRQ(handler_irq, 5)
-#ifdef CONFIG_SMP
-tl0_irq6:	TRAP_IRQ(smp_call_function_single_client, 6)
-#else
-tl0_irq6:	BTRAP(0x46)
-#endif
-tl0_irq7:	TRAP_IRQ(deferred_pcr_work_irq, 7)
+tl0_irq6:	TRAP_IRQ(deferred_pcr_work_irq, 6)
 #if defined(CONFIG_KGDB) && defined(CONFIG_SMP)
-tl0_irq8:	TRAP_IRQ(smp_kgdb_capture_client, 8)
+tl0_irq7:	TRAP_IRQ(smp_kgdb_capture_client, 7)
 #else
-tl0_irq8:	BTRAP(0x48)
+tl0_irq7:	BTRAP(0x47)
 #endif
+tl0_irq8:	BTRAP(0x48)
 tl0_irq9:	BTRAP(0x49)
 tl0_irq10:	BTRAP(0x4a) BTRAP(0x4b) BTRAP(0x4c) BTRAP(0x4d)
 tl0_irq14:	TRAP_IRQ(timer_interrupt, 14)
diff --git a/arch/sparc/mm/ultra.S b/arch/sparc/mm/ultra.S
index 432aa0c..9b23d97 100644
--- a/arch/sparc/mm/ultra.S
+++ b/arch/sparc/mm/ultra.S
@@ -780,11 +780,6 @@ xcall_call_function:
 	wr		%g0, (1 << PIL_SMP_CALL_FUNC), %set_softint
 	retry
 
-	.globl		xcall_call_function_single
-xcall_call_function_single:
-	wr		%g0, (1 << PIL_SMP_CALL_FUNC_SNGL), %set_softint
-	retry
-
 	.globl		xcall_receive_signal
 xcall_receive_signal:
 	wr		%g0, (1 << PIL_SMP_RECEIVE_SIGNAL), %set_softint
-- 
1.8.1.2