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Commit 61b5cb1c authored by Rabin Vincent's avatar Rabin Vincent
Browse files

ARM: place C irq handlers in IRQ_ENTRY for ftrace 



When FUNCTION_GRAPH_TRACER is enabled, place do_IRQ() and friends in the
IRQ_ENTRY section so that the irq-related features of the function graph
tracer work.

Signed-off-by: default avatarRabin Vincent <rabin@rab.in>
parent ec763f0d

arch/arm/include/asm/system.h

+5 −0
Original line number Diff line number Diff line
@@ -63,6 +63,11 @@ 
#include <asm/outercache.h>



#define __exception	__attribute__((section(".exception.text")))

#ifdef CONFIG_FUNCTION_GRAPH_TRACER

#define __exception_irq_entry	__irq_entry

#else

#define __exception_irq_entry	__exception

#endif



struct thread_info;

struct task_struct;

arch/arm/include/asm/traps.h

+21 −2
Original line number Diff line number Diff line
@@ -15,13 +15,32 @@ struct undef_hook { 
void register_undef_hook(struct undef_hook *hook);

void unregister_undef_hook(struct undef_hook *hook);



#ifdef CONFIG_FUNCTION_GRAPH_TRACER

static inline int __in_irqentry_text(unsigned long ptr)

{

	extern char __irqentry_text_start[];

	extern char __irqentry_text_end[];



	return ptr >= (unsigned long)&__irqentry_text_start &&

	       ptr < (unsigned long)&__irqentry_text_end;

}

#else

static inline int __in_irqentry_text(unsigned long ptr)

{

	return 0;

}

#endif



static inline int in_exception_text(unsigned long ptr)

{

	extern char __exception_text_start[];

	extern char __exception_text_end[];

	int in;



	return ptr >= (unsigned long)&__exception_text_start &&

	in = ptr >= (unsigned long)&__exception_text_start &&

	     ptr < (unsigned long)&__exception_text_end;



	return in ? : __in_irqentry_text(ptr);

}



extern void __init early_trap_init(void);

arch/arm/kernel/irq.c

+3 −1
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include <linux/list.h>

#include <linux/kallsyms.h>

#include <linux/proc_fs.h>

#include <linux/ftrace.h>



#include <asm/system.h>

#include <asm/mach/irq.h>
@@ -105,7 +106,8 @@ int show_interrupts(struct seq_file *p, void *v) 
 * come via this function.  Instead, they should provide their

 * own 'handler'

 */

asmlinkage void __exception asm_do_IRQ(unsigned int irq, struct pt_regs *regs)

asmlinkage void __exception_irq_entry

asm_do_IRQ(unsigned int irq, struct pt_regs *regs)

{

	struct pt_regs *old_regs = set_irq_regs(regs);

arch/arm/kernel/smp.c

+3 −2
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/cache.h>

#include <linux/profile.h>

#include <linux/errno.h>

#include <linux/ftrace.h>

#include <linux/mm.h>

#include <linux/err.h>

#include <linux/cpu.h>
@@ -457,7 +458,7 @@ static void ipi_timer(void) 
}



#ifdef CONFIG_LOCAL_TIMERS

asmlinkage void __exception do_local_timer(struct pt_regs *regs)

asmlinkage void __exception_irq_entry do_local_timer(struct pt_regs *regs)

{

	struct pt_regs *old_regs = set_irq_regs(regs);

	int cpu = smp_processor_id();
@@ -544,7 +545,7 @@ static void ipi_cpu_stop(unsigned int cpu) 
 *

 *  Bit 0 - Inter-processor function call

 */

asmlinkage void __exception do_IPI(struct pt_regs *regs)

asmlinkage void __exception_irq_entry do_IPI(struct pt_regs *regs)

{

	unsigned int cpu = smp_processor_id();

	struct ipi_data *ipi = &per_cpu(ipi_data, cpu);

arch/arm/kernel/vmlinux.lds.S

+1 −0
Original line number Diff line number Diff line
@@ -101,6 +101,7 @@ SECTIONS 
			__exception_text_start = .;

			*(.exception.text)

			__exception_text_end = .;

			IRQENTRY_TEXT

			TEXT_TEXT

			SCHED_TEXT

			LOCK_TEXT