[Xen-changelog] [xen master] xen: arm: enable synchronous console while starting secondary CPUs

[patchbot@xxxxxxx]

commit c241a8981a9f5709e100363bd0e5d6fdb6d90bbc
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Fri Oct 11 17:23:18 2013 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Fri Nov 29 09:26:07 2013 +0000

    xen: arm: enable synchronous console while starting secondary CPUs
    
    Setting synchronous console ensures that any printk hits the buffer
    immediately and that any outstanding queued log messages are flushed. This
    ensures that such log messages are not being printed while the secondary CPU
    may be using early_printk during early bringup.
    
    Signed-of-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Cc: Keir Fraser <keir@xxxxxxx>
---
 xen/arch/arm/smpboot.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index 7636ab8..e862477 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -28,6 +28,7 @@
 #include <xen/softirq.h>
 #include <xen/timer.h>
 #include <xen/irq.h>
+#include <xen/console.h>
 #include <asm/gic.h>
 
 cpumask_t cpu_online_map;
@@ -356,6 +357,8 @@ int __cpu_up(unsigned int cpu)
     if ( rc < 0 )
         return rc;
 
+    console_start_sync(); /* Secondary may use early_printk */
+
     /* Tell the remote CPU which stack to boot on. */
     init_data.stack = idle_vcpu[cpu]->arch.stack;
 
@@ -368,6 +371,8 @@ int __cpu_up(unsigned int cpu)
 
     rc = arch_cpu_up(cpu);
 
+    console_end_sync();
+
     if ( rc < 0 )
     {
         printk("Failed to bring up CPU%d\n", cpu);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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