From: Keir Fraser <keir@xen.org>
Date: Wed, 15 Dec 2010 12:04:34 +0000 (+0000)
Subject: Reduce side effects of handling '*' debug key
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=e1d4636fef0bd962a70f2b1b38a7b2dd4810c378;p=xen.git

Reduce side effects of handling '*' debug key

NMI watchdog should be suppressed when dumping IRQ handlers. Softirqs
should be handled periodically while processing non-IRQ handlers.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
---

diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c
index f05bde01ff..81c65fd697 100644
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -444,16 +444,15 @@ static void run_all_nonirq_keyhandlers(unsigned long unused)
     struct keyhandler *h;
     int k;
 
-    console_start_log_everything();
     for ( k = 0; k < ARRAY_SIZE(key_table); k++ )
     {
+        process_pending_softirqs();
         h = key_table[k];
         if ( (h == NULL) || !h->diagnostic || h->irq_callback )
             continue;
         printk("[%c: %s]\n", k, h->desc);
         (*h->u.fn)(k);
     }
-    console_end_log_everything();
 }
 
 static DECLARE_TASKLET(run_all_keyhandlers_tasklet,
@@ -464,10 +463,11 @@ static void run_all_keyhandlers(unsigned char key, struct cpu_user_regs *regs)
     struct keyhandler *h;
     int k;
 
+    watchdog_disable();
+
     printk("'%c' pressed -> firing all diagnostic keyhandlers\n", key);
 
     /* Fire all the IRQ-context diangostic keyhandlers now */
-    console_start_log_everything();
     for ( k = 0; k < ARRAY_SIZE(key_table); k++ )
     {
         h = key_table[k];
@@ -476,7 +476,8 @@ static void run_all_keyhandlers(unsigned char key, struct cpu_user_regs *regs)
         printk("[%c: %s]\n", k, h->desc);
         (*h->u.irq_fn)(k, regs);
     }
-    console_end_log_everything();
+
+    watchdog_enable();
 
     /* Trigger the others from a tasklet in non-IRQ context */
     tasklet_schedule(&run_all_keyhandlers_tasklet);