[PATCH 10/10] ARM: run softirqs on the per-CPU IRQ stack
From: Ard Biesheuvel <ardb@kernel.org>
Date: 2021-09-21 09:59:19
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Now that we have enabled IRQ stacks, any softIRQs that are handled over the back of a hard IRQ will run from the IRQ stack as well. However, any synchronous softirq processing that happens when re-enabling softIRQs from task context will still execute on that task's stack. So let's wire up the existing infrastructure to run these softIRQs from the IRQ stack as well. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- arch/arm/Kconfig | 2 ++ arch/arm/kernel/irq.c | 8 ++++++++ 2 files changed, 10 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a8c1db0736f3..d46b243e1b26 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig@@ -1166,6 +1166,8 @@ config CURRENT_POINTER_IN_TPIDRURO config IRQSTACKS def_bool y depends on GENERIC_IRQ_MULTI_HANDLER && THREAD_INFO_IN_TASK + select HAVE_IRQ_EXIT_ON_IRQ_STACK + select HAVE_SOFTIRQ_ON_OWN_STACK config ARM_CPU_TOPOLOGY bool "Support cpu topology definition"
diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 58af2adb1583..feb07f703a98 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c@@ -41,6 +41,8 @@ #include <asm/mach/irq.h> #include <asm/mach/time.h> +#include "reboot.h" + unsigned long irq_err_count; #ifdef CONFIG_IRQSTACKS
@@ -60,6 +62,12 @@ static void __init init_irq_stacks(void) } } +void do_softirq_own_stack(void) +{ + call_with_stack((void *)__do_softirq, NULL, + __this_cpu_read(irq_stack_ptr)); +} + #endif int arch_show_interrupts(struct seq_file *p, int prec)
--
2.30.2
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