From mboxrd@z Thu Jan 1 00:00:00 1970 From: shawn.guo@linaro.org (Shawn Guo) Date: Sun, 2 Oct 2011 16:57:00 +0800 Subject: [PATCH 1/2] ARM: smp: Add an IPI handler callable from C code In-Reply-To: <1317545821-23194-1-git-send-email-shawn.guo@linaro.org> References: <1317545821-23194-1-git-send-email-shawn.guo@linaro.org> Message-ID: <1317545821-23194-2-git-send-email-shawn.guo@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Marc Zyngier In order to be able to handle IPI directly from C code instead of assembly code, introduce handle_IPI(), which is modeled after handle_IRQ(). Signed-off-by: Marc Zyngier --- arch/arm/include/asm/smp.h | 5 +++++ arch/arm/kernel/smp.c | 5 +++++ 2 files changed, 10 insertions(+), 0 deletions(-) diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h index 674ebcd..0a17b62 100644 --- a/arch/arm/include/asm/smp.h +++ b/arch/arm/include/asm/smp.h @@ -33,6 +33,11 @@ extern void show_ipi_list(struct seq_file *, int); asmlinkage void do_IPI(int ipinr, struct pt_regs *regs); /* + * Called from C code, this handles an IPI. + */ +void handle_IPI(int ipinr, struct pt_regs *regs); + +/* * Setup the set of possible CPUs (via set_cpu_possible) */ extern void smp_init_cpus(void); diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 3f12ce9..2e49f18 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -587,6 +587,11 @@ static void ipi_cpu_stop(unsigned int cpu) */ asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs) { + handle_IPI(ipinr, regs); +} + +void handle_IPI(int ipinr, struct pt_regs *regs) +{ unsigned int cpu = smp_processor_id(); struct pt_regs *old_regs = set_irq_regs(regs); -- 1.7.4.1