asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig.

Remove the CONFIG_PREEMPT_RT symbol from the ifdef around
do_softirq_own_stack() and move it to Kconfig instead.

Enable softirq stacks based on SOFTIRQ_ON_OWN_STACK which depends on
HAVE_SOFTIRQ_ON_OWN_STACK and its default value is set to !PREEMPT_RT.
This ensures that softirq stacks are not used on PREEMPT_RT and avoids
a 'select' statement on an option which has a 'depends' statement.

Link: https://lore.kernel.org/YvN5E%2FPrHfUhggr7@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/Kconfig b/arch/Kconfig
index 5dbf11a..8b311e4 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -923,6 +923,9 @@ config HAVE_SOFTIRQ_ON_OWN_STACK
          Architecture provides a function to run __do_softirq() on a
          separate stack.
 
+config SOFTIRQ_ON_OWN_STACK
+       def_bool HAVE_SOFTIRQ_ON_OWN_STACK && !PREEMPT_RT
+
 config ALTERNATE_USER_ADDRESS_SPACE
        bool
        help

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 034cb48..fe28fc1 100644 (file)
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -70,7 +70,7 @@ static void __init init_irq_stacks(void)
        }
 }
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 static void ____do_softirq(void *arg)
 {
        __do_softirq();

diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index fbb882c..b05055f 100644 (file)
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -480,7 +480,7 @@ static void execute_on_irq_stack(void *func, unsigned long param1)
        *irq_stack_in_use = 1;
 }
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 void do_softirq_own_stack(void)
 {
        execute_on_irq_stack(__do_softirq, 0);

diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 0f17268..9ede61a 100644 (file)
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -199,7 +199,7 @@ static inline void check_stack_overflow(unsigned long sp)
        }
 }
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 static __always_inline void call_do_softirq(const void *sp)
 {
        /* Temporarily switch r1 to sp, call __do_softirq() then restore r1. */
@@ -335,7 +335,7 @@ void *mcheckirq_ctx[NR_CPUS] __read_mostly;
 void *softirq_ctx[NR_CPUS] __read_mostly;
 void *hardirq_ctx[NR_CPUS] __read_mostly;
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 void do_softirq_own_stack(void)
 {
        call_do_softirq(softirq_ctx[smp_processor_id()]);

diff --git a/arch/s390/include/asm/softirq_stack.h b/arch/s390/include/asm/softirq_stack.h
index af68d6c..1ac5115 100644 (file)
--- a/arch/s390/include/asm/softirq_stack.h
+++ b/arch/s390/include/asm/softirq_stack.h
@@ -5,7 +5,7 @@
 #include <asm/lowcore.h>
 #include <asm/stacktrace.h>
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 static inline void do_softirq_own_stack(void)
 {
        call_on_stack(0, S390_lowcore.async_stack, void, __do_softirq);

diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 9092767..4e6835d 100644 (file)
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -149,7 +149,7 @@ void irq_ctx_exit(int cpu)
        hardirq_ctx[cpu] = NULL;
 }
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 void do_softirq_own_stack(void)
 {
        struct thread_info *curctx;

diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c
index 41fa1be..72da2e1 100644 (file)
--- a/arch/sparc/kernel/irq_64.c
+++ b/arch/sparc/kernel/irq_64.c
@@ -855,7 +855,7 @@ void __irq_entry handler_irq(int pil, struct pt_regs *regs)
        set_irq_regs(old_regs);
 }
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 void do_softirq_own_stack(void)
 {
        void *orig_sp, *sp = softirq_stack[smp_processor_id()];

diff --git a/arch/x86/include/asm/irq_stack.h b/arch/x86/include/asm/irq_stack.h
index 63f818a..147cb8f 100644 (file)
--- a/arch/x86/include/asm/irq_stack.h
+++ b/arch/x86/include/asm/irq_stack.h
@@ -203,7 +203,7 @@
                              IRQ_CONSTRAINTS, regs, vector);           \
 }
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 /*
  * Macro to invoke __do_softirq on the irq stack. This is only called from
  * task context when bottom halves are about to be reenabled and soft

diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index e5dd6da..01833eb 100644 (file)
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -132,7 +132,7 @@ int irq_init_percpu_irqstack(unsigned int cpu)
        return 0;
 }
 
-#ifndef CONFIG_PREEMPT_RT
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 void do_softirq_own_stack(void)
 {
        struct irq_stack *irqstk;

diff --git a/include/asm-generic/softirq_stack.h b/include/asm-generic/softirq_stack.h
index d3e2d81..2a67aed 100644 (file)
--- a/include/asm-generic/softirq_stack.h
+++ b/include/asm-generic/softirq_stack.h
@@ -2,7 +2,7 @@
 #ifndef __ASM_GENERIC_SOFTIRQ_STACK_H
 #define __ASM_GENERIC_SOFTIRQ_STACK_H
 
-#if defined(CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK) && !defined(CONFIG_PREEMPT_RT)
+#ifdef CONFIG_SOFTIRQ_ON_OWN_STACK
 void do_softirq_own_stack(void);
 #else
 static inline void do_softirq_own_stack(void)