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tracing/function-graph-tracer: annotate do_IRQ and smp_apic_timer_interrupt
Impact: move most important x86 irq entry-points to a separate subsection Annotate do_IRQ and smp_apic_timer_interrupt to put them into the .irqentry.text subsection. These function will so be recognized as hardirq entrypoints for the function-graph-tracer. We could also annotate other irq entries but the others are far less important but they can be added on request. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -30,6 +30,7 @@
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/dmar.h>
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#include <linux/ftrace.h>
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#include <asm/atomic.h>
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#include <asm/smp.h>
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@ -800,7 +801,7 @@ static void local_apic_timer_interrupt(void)
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* [ if a single-CPU system runs an SMP kernel then we call the local
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* interrupt as well. Thus we cannot inline the local irq ... ]
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*/
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void smp_apic_timer_interrupt(struct pt_regs *regs)
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void __irq_entry smp_apic_timer_interrupt(struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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@ -13,6 +13,7 @@
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#include <linux/seq_file.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/ftrace.h>
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#include <asm/uaccess.h>
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#include <asm/io_apic.h>
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#include <asm/idle.h>
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@ -47,7 +48,7 @@ static inline void stack_overflow_check(struct pt_regs *regs)
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* SMP cross-CPU interrupts have their own specific
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* handlers).
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*/
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asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
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asmlinkage unsigned int __irq_entry do_IRQ(struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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struct irq_desc *desc;
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@ -377,6 +377,16 @@ struct ftrace_graph_ret {
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*/
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#define __notrace_funcgraph notrace
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/*
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* We want to which function is an entrypoint of a hardirq.
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* That will help us to put a signal on output.
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*/
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#define __irq_entry __attribute__((__section__(".irqentry.text")))
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/* Limits of hardirq entrypoints */
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extern char __irqentry_text_start[];
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extern char __irqentry_text_end[];
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#define FTRACE_RETFUNC_DEPTH 50
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#define FTRACE_RETSTACK_ALLOC_SIZE 32
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/* Type of the callback handlers for tracing function graph*/
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@ -414,6 +424,7 @@ static inline void unpause_graph_tracing(void)
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#else
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#define __notrace_funcgraph
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#define __irq_entry
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static inline void ftrace_graph_init_task(struct task_struct *t) { }
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static inline void ftrace_graph_exit_task(struct task_struct *t) { }
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