X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=arch%2Fmips%2Fkernel%2Firq.c;h=4f93db58a79ed9bdbecb1ba53c0c3eed9261d2e6;hb=334c86c494b9a5754d4c0ffa3110b18c9771013b;hp=c6345f579a8a4ea13d00251c4d47272b4afffa1d;hpb=677abe49ad017679627af9d3bbd9a7ecb3d94c42;p=karo-tx-linux.git

diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
index c6345f579a8a..4f93db58a79e 100644
--- a/arch/mips/kernel/irq.c
+++ b/arch/mips/kernel/irq.c
@@ -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();