[PATCH] x86_64: (resend) x86_64 stack overflow debugging

Take two, now without spurious whitespace :(  Applies to git & 2.6.17-rc6

CONFIG_DEBUG_STACKOVERFLOW existed for x86_64 in 2.4, but seems to have gone AWOL in 2.6.

I've pretty much just copied this over from the 2.4 code, with
appropriate tweaks for the 2.6 kernel, plus a bugfix.  I'd personally
rather see it printed out the way other arches do it, i.e.
bytes-remaining-until-overflow, rather than having to do the subtraction
yourself.  Also, only 128 bytes remaining seems awfully late to issue a
warning.  But I'll start here :)

Signed-off-by: Eric Sandeen <sandeen@sgi.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 34 insertions, 1 deletions

diff --git a/arch/x86_64/Kconfig.debug b/arch/x86_64/Kconfig.debug
index 0226f08be874..087a04868b25 100644
--- a/arch/x86_64/Kconfig.debug
+++ b/arch/x86_64/Kconfig.debug
@@ -35,6 +35,13 @@ config IOMMU_LEAK
          Add a simple leak tracer to the IOMMU code. This is useful when you
          are debugging a buggy device driver that leaks IOMMU mappings.
 
+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.
+
 #config X86_REMOTE_DEBUG
 #       bool "kgdb debugging stub"
 
diff --git a/arch/x86_64/kernel/irq.c b/arch/x86_64/kernel/irq.c
index 207ecdc39822..59518d4d4358 100644
--- a/arch/x86_64/kernel/irq.c
+++ b/arch/x86_64/kernel/irq.c
@@ -26,6 +26,30 @@ atomic_t irq_mis_count;
 #endif
 #endif
 
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+/*
+ * Probabilistic stack overflow check:
+ *
+ * Only check the stack in process context, because everything else
+ * runs on the big interrupt stacks. Checking reliably is too expensive,
+ * so we just check from interrupts.
+ */
+static inline void stack_overflow_check(struct pt_regs *regs)
+{
+        u64 curbase = (u64) current->thread_info;
+        static unsigned long warned = -60*HZ;
+
+        if (regs->rsp >= curbase && regs->rsp <= curbase + THREAD_SIZE &&
+            regs->rsp <  curbase + sizeof(struct thread_info) + 128 &&
+            time_after(jiffies, warned + 60*HZ)) {
+                printk("do_IRQ: %s near stack overflow (cur:%Lx,rsp:%lx)\n",
+                       current->comm, curbase, regs->rsp);
+                show_stack(NULL,NULL);
+                warned = jiffies;
+        }
+}
+#endif
+
 /*
  * Generic, controller-independent functions:
  */
@@ -96,7 +120,9 @@ asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
 
         exit_idle();
         irq_enter();
-
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+        stack_overflow_check(regs);
+#endif
         __do_IRQ(irq, regs);
         irq_exit();