[Xen-devel] [PATCH] x86/time: Identify the platform timer before attempting to probe it

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

When platform timer initialisation fails due to missing interrupts, hardware
tends to livelock without identifying the timer in use.

Leave a trace around to help debugging.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Brian Woods <brian.woods@xxxxxxx>
---
 xen/arch/x86/time.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 24d4c27..992540a 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -795,6 +795,7 @@ static u64 __init init_platform_timer(void)
         for ( i = 0; i < ARRAY_SIZE(plt_timers); i++ )
         {
             pts = plt_timers[i];
+            printk(XENLOG_DEBUG "Probing platform timer %s\n", pts->name);
             if ( (rc = try_platform_timer(pts)) > 0 )
                 break;
         }
-- 
2.1.4


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