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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0120-softirq-Disable-softirq-stacks-for-RT.patch | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/debian/patches-rt/0120-softirq-Disable-softirq-stacks-for-RT.patch b/debian/patches-rt/0120-softirq-Disable-softirq-stacks-for-RT.patch new file mode 100644 index 000000000..3c4ba7e3e --- /dev/null +++ b/debian/patches-rt/0120-softirq-Disable-softirq-stacks-for-RT.patch @@ -0,0 +1,177 @@ +From 7e198889f2947f9bfeecdda6955492f55399a621 Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Mon, 18 Jul 2011 13:59:17 +0200 +Subject: [PATCH 120/347] softirq: Disable softirq stacks for RT +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +Disable extra stacks for softirqs. We want to preempt softirqs and +having them on special IRQ-stack does not make this easier. + +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +--- + arch/powerpc/kernel/irq.c | 2 ++ + arch/powerpc/kernel/misc_32.S | 2 ++ + arch/powerpc/kernel/misc_64.S | 2 ++ + arch/sh/kernel/irq.c | 2 ++ + arch/sparc/kernel/irq_64.c | 2 ++ + arch/x86/entry/entry_64.S | 2 ++ + arch/x86/kernel/irq_32.c | 2 ++ + include/linux/interrupt.h | 2 +- + 8 files changed, 15 insertions(+), 1 deletion(-) + +diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c +index d37704ebccdb..b45a9849b687 100644 +--- a/arch/powerpc/kernel/irq.c ++++ b/arch/powerpc/kernel/irq.c +@@ -766,6 +766,7 @@ void irq_ctx_init(void) + } + } + ++#ifndef CONFIG_PREEMPT_RT_FULL + void do_softirq_own_stack(void) + { + struct thread_info *curtp, *irqtp; +@@ -783,6 +784,7 @@ void do_softirq_own_stack(void) + if (irqtp->flags) + set_bits(irqtp->flags, &curtp->flags); + } ++#endif + + irq_hw_number_t virq_to_hw(unsigned int virq) + { +diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S +index 695b24a2d954..032ada21b7bd 100644 +--- a/arch/powerpc/kernel/misc_32.S ++++ b/arch/powerpc/kernel/misc_32.S +@@ -42,6 +42,7 @@ + * We store the saved ksp_limit in the unused part + * of the STACK_FRAME_OVERHEAD + */ ++#ifndef CONFIG_PREEMPT_RT_FULL + _GLOBAL(call_do_softirq) + mflr r0 + stw r0,4(r1) +@@ -58,6 +59,7 @@ _GLOBAL(call_do_softirq) + stw r10,THREAD+KSP_LIMIT(r2) + mtlr r0 + blr ++#endif + + /* + * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp); +diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S +index facc02964ab3..8b1774186c68 100644 +--- a/arch/powerpc/kernel/misc_64.S ++++ b/arch/powerpc/kernel/misc_64.S +@@ -32,6 +32,7 @@ + + .text + ++#ifndef CONFIG_PREEMPT_RT_FULL + _GLOBAL(call_do_softirq) + mflr r0 + std r0,16(r1) +@@ -42,6 +43,7 @@ _GLOBAL(call_do_softirq) + ld r0,16(r1) + mtlr r0 + blr ++#endif + + _GLOBAL(call_do_irq) + mflr r0 +diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c +index 5717c7cbdd97..66dd399b2007 100644 +--- a/arch/sh/kernel/irq.c ++++ b/arch/sh/kernel/irq.c +@@ -148,6 +148,7 @@ void irq_ctx_exit(int cpu) + hardirq_ctx[cpu] = NULL; + } + ++#ifndef CONFIG_PREEMPT_RT_FULL + void do_softirq_own_stack(void) + { + struct thread_info *curctx; +@@ -175,6 +176,7 @@ void do_softirq_own_stack(void) + "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr" + ); + } ++#endif + #else + static inline void handle_one_irq(unsigned int irq) + { +diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c +index 713670e6d13d..5dfc715343f9 100644 +--- a/arch/sparc/kernel/irq_64.c ++++ b/arch/sparc/kernel/irq_64.c +@@ -854,6 +854,7 @@ void __irq_entry handler_irq(int pil, struct pt_regs *regs) + set_irq_regs(old_regs); + } + ++#ifndef CONFIG_PREEMPT_RT_FULL + void do_softirq_own_stack(void) + { + void *orig_sp, *sp = softirq_stack[smp_processor_id()]; +@@ -868,6 +869,7 @@ void do_softirq_own_stack(void) + __asm__ __volatile__("mov %0, %%sp" + : : "r" (orig_sp)); + } ++#endif + + #ifdef CONFIG_HOTPLUG_CPU + void fixup_irqs(void) +diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S +index dfe26f3cfffc..f53d995b1370 100644 +--- a/arch/x86/entry/entry_64.S ++++ b/arch/x86/entry/entry_64.S +@@ -1084,6 +1084,7 @@ EXPORT_SYMBOL(native_load_gs_index) + jmp 2b + .previous + ++#ifndef CONFIG_PREEMPT_RT_FULL + /* Call softirq on interrupt stack. Interrupts are off. */ + ENTRY(do_softirq_own_stack) + pushq %rbp +@@ -1094,6 +1095,7 @@ ENTRY(do_softirq_own_stack) + leaveq + ret + ENDPROC(do_softirq_own_stack) ++#endif + + #ifdef CONFIG_XEN + idtentry hypervisor_callback xen_do_hypervisor_callback has_error_code=0 +diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c +index 95600a99ae93..9192d76085ba 100644 +--- a/arch/x86/kernel/irq_32.c ++++ b/arch/x86/kernel/irq_32.c +@@ -130,6 +130,7 @@ void irq_ctx_init(int cpu) + cpu, per_cpu(hardirq_stack, cpu), per_cpu(softirq_stack, cpu)); + } + ++#ifndef CONFIG_PREEMPT_RT_FULL + void do_softirq_own_stack(void) + { + struct irq_stack *irqstk; +@@ -146,6 +147,7 @@ void do_softirq_own_stack(void) + + call_on_stack(__do_softirq, isp); + } ++#endif + + bool handle_irq(struct irq_desc *desc, struct pt_regs *regs) + { +diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h +index 35fa335c475b..eec4bec454b5 100644 +--- a/include/linux/interrupt.h ++++ b/include/linux/interrupt.h +@@ -500,7 +500,7 @@ struct softirq_action + asmlinkage void do_softirq(void); + asmlinkage void __do_softirq(void); + +-#ifdef __ARCH_HAS_DO_SOFTIRQ ++#if defined(__ARCH_HAS_DO_SOFTIRQ) && !defined(CONFIG_PREEMPT_RT_FULL) + void do_softirq_own_stack(void); + #else + static inline void do_softirq_own_stack(void) +-- +2.36.1 + |