From mboxrd@z Thu Jan 1 00:00:00 1970 From: marc.zyngier@arm.com (Marc Zyngier) Date: Fri, 18 Dec 2015 09:16:12 +0000 Subject: [PATCH 1/2] ARM: Remove IPI_CALL_FUNC_SINGLE In-Reply-To: <1450430173-26992-1-git-send-email-marc.zyngier@arm.com> References: <1450430173-26992-1-git-send-email-marc.zyngier@arm.com> Message-ID: <1450430173-26992-2-git-send-email-marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Since 9a46ad6d6df3 ("smp: make smp_call_function_many() use logic similar to smp_call_function_single()"), the core IPI handling has been simplified, and generic_smp_call_function_interrupt is now the same as generic_smp_call_function_single_interrupt. This means that one of IPI_CALL_FUNC and IPI_CALL_FUNC_SINGLE has become redundant. We can then safely drop IPI_CALL_FUNC_SINGLE, and use only IPI_CALL_FUNC. This has the advantage of reducing the number of SGI IDs we're using (a fairly scarse resource). Tested on a dual A7 board. Signed-off-by: Marc Zyngier --- arch/arm/include/asm/hardirq.h | 2 +- arch/arm/kernel/smp.c | 10 +--------- 2 files changed, 2 insertions(+), 10 deletions(-) diff --git a/arch/arm/include/asm/hardirq.h b/arch/arm/include/asm/hardirq.h index fe3ea77..3d7351c 100644 --- a/arch/arm/include/asm/hardirq.h +++ b/arch/arm/include/asm/hardirq.h @@ -5,7 +5,7 @@ #include #include -#define NR_IPI 8 +#define NR_IPI 7 typedef struct { unsigned int __softirq_pending; diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index b263613..d50a77d 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -69,7 +69,6 @@ enum ipi_msg_type { IPI_TIMER, IPI_RESCHEDULE, IPI_CALL_FUNC, - IPI_CALL_FUNC_SINGLE, IPI_CPU_STOP, IPI_IRQ_WORK, IPI_COMPLETION, @@ -475,7 +474,6 @@ static const char *ipi_types[NR_IPI] __tracepoint_string = { S(IPI_TIMER, "Timer broadcast interrupts"), 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"), S(IPI_IRQ_WORK, "IRQ work interrupts"), S(IPI_COMPLETION, "completion interrupts"), @@ -525,7 +523,7 @@ void arch_send_wakeup_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); } #ifdef CONFIG_IRQ_WORK @@ -620,12 +618,6 @@ 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); -- 2.1.4