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Subject[PATCH v3 [resend] 05/18] smp, ARM64: kill SMP single function call interrupt
Date
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.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shaohua Li <shli@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jiri Kosina <trivial@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Jiang Liu <liuj97@gmail.com>
---
arch/arm64/include/asm/hardirq.h | 2 +-
arch/arm64/kernel/smp.c | 10 +---------
2 files changed, 2 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h
index 990c051..3be64c8 100644
--- a/arch/arm64/include/asm/hardirq.h
+++ b/arch/arm64/include/asm/hardirq.h
@@ -20,7 +20,7 @@
#include <linux/threads.h>
#include <asm/irq.h>

-#define NR_IPI 4
+#define NR_IPI 3

typedef struct {
unsigned int __softirq_pending;
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index a0c2ca6..ea3e9ab 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -59,7 +59,6 @@ struct secondary_data secondary_data;
enum ipi_msg_type {
IPI_RESCHEDULE,
IPI_CALL_FUNC,
- IPI_CALL_FUNC_SINGLE,
IPI_CPU_STOP,
};

@@ -438,14 +437,13 @@ void arch_send_call_function_ipi_mask(const struct cpumask *mask)

void arch_send_call_function_single_ipi(int cpu)
{
- smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
+ smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC);
}

static const char *ipi_types[NR_IPI] = {
#define S(x,s) [x - IPI_RESCHEDULE] = s
S(IPI_RESCHEDULE, "Rescheduling interrupts"),
S(IPI_CALL_FUNC, "Function call interrupts"),
- S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
S(IPI_CPU_STOP, "CPU stop interrupts"),
};

@@ -520,12 +518,6 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
irq_exit();
break;

- case IPI_CALL_FUNC_SINGLE:
- irq_enter();
- generic_smp_call_function_single_interrupt();
- irq_exit();
- break;
-
case IPI_CPU_STOP:
irq_enter();
ipi_cpu_stop(cpu);
--
1.8.1.2


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