Commit 334c86c4 authored by From: jiang.adam@gmail.com's avatar From: jiang.adam@gmail.com Committed by Ralf Baechle
Browse files

MIPS: IRQ: Add stackoverflow detection 



Add stackoverflow detection to mips arch

Signed-off-by: default avatarAdam Jiang <jiang.adam@gmail.com>
Cc: dmitri.vorobiev@movial.com
Cc: wuzhangjin@gmail.com
Cc: ddaney@caviumnetworks.com
Cc: peterz@infradead.org
Cc: fweisbec@gmail.com
Cc: tj@kernel.org
Cc: tglx@linutronix.de
Cc: mingo@elte.hu
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1559/
Patchwork: https://patchwork.linux-mips.org/patch/1651/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent b7880715

arch/mips/Kconfig.debug

+9 −0
Original line number Diff line number Diff line
@@ -67,6 +67,15 @@ config CMDLINE_OVERRIDE 


	  Normally, you will choose 'N' here.



config DEBUG_STACKOVERFLOW

	bool "Check for stack overflows"

	depends on DEBUG_KERNEL

	help

	  This option will cause messages to be printed if free stack space

	  drops below a certain limit(2GB on MIPS). The debugging option

	  provides another way to check stack overflow happened on kernel mode

	  stack usually caused by nested interruption.



config DEBUG_STACK_USAGE

	bool "Enable stack utilization instrumentation"

	depends on DEBUG_KERNEL

arch/mips/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -83,6 +83,8 @@ register struct thread_info *__current_thread_info __asm__("$28"); 
#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)

#define THREAD_MASK (THREAD_SIZE - 1UL)



#define STACK_WARN	(THREAD_SIZE / 8)



#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR



#ifdef CONFIG_DEBUG_STACK_USAGE

arch/mips/kernel/irq.c

+24 −0
Original line number Diff line number Diff line
@@ -151,6 +151,29 @@ void __init init_IRQ(void) 
#endif

}



#ifdef DEBUG_STACKOVERFLOW

static inline void check_stack_overflow(void)

{

	unsigned long sp;



	__asm__ __volatile__("move %0, $sp" : "=r" (sp));

	sp &= THREAD_MASK;



	/*

	 * Check for stack overflow: is there less than STACK_WARN free?

	 * STACK_WARN is defined as 1/8 of THREAD_SIZE by default.

	 */

	if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {

		printk("do_IRQ: stack overflow: %ld\n",

		       sp - sizeof(struct thread_info));

		dump_stack();

	}

}

#else

static inline void check_stack_overflow(void) {}

#endif





/*

 * do_IRQ handles all normal device IRQ's (the special

 * SMP cross-CPU interrupts have their own specific
@@ -159,6 +182,7 @@ void __init init_IRQ(void) 
void __irq_entry do_IRQ(unsigned int irq)

{

	irq_enter();

	check_stack_overflow();

	__DO_IRQ_SMTC_HOOK(irq);

	generic_handle_irq(irq);

	irq_exit();

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