[POWERPC] Avoid pointless WARN_ON(irqs_disabled()) from panic codepath

> ------------[ cut here ]------------
> Badness at arch/powerpc/kernel/smp.c:202

comes when smp_call_function_map() has been called with irqs disabled,
which is illegal. However, there is a special case, the panic() codepath,
when we do not want to warn about this -- warning at that time is pointless
anyway, and only serves to scroll away the *real* cause of the panic and
distracts from the real bug.

* So let's extract the WARN_ON() from smp_call_function_map() into all its
  callers -- smp_call_function() and smp_call_function_single()

* Also, introduce another caller of smp_call_function_map(), namely
  __smp_call_function() (and make smp_call_function() a wrapper over this)
  which does *not* warn about disabled irqs

* Use this __smp_call_function() from the panic codepath's smp_send_stop()

We also end having to move code of smp_send_stop() below the definition
of __smp_call_function().

Signed-off-by: Satyam Sharma <satyam@infradead.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 18 insertions, 9 deletions

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 1ea43160f543..b24dcbaeecaa 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -152,11 +152,6 @@ static void stop_this_cpu(void *dummy)
                 ;
 }
 
-void smp_send_stop(void)
-{
-        smp_call_function(stop_this_cpu, NULL, 1, 0);
-}
-
 /*
  * Structure and data for smp_call_function(). This is designed to minimise
  * static memory requirements. It also looks cleaner.
@@ -198,9 +193,6 @@ int smp_call_function_map(void (*func) (void *info), void *info, int nonatomic,
         int cpu;
         u64 timeout;
 
-        /* Can deadlock when called with interrupts disabled */
-        WARN_ON(irqs_disabled());
-
         if (unlikely(smp_ops == NULL))
                 return ret;
 
@@ -270,10 +262,19 @@ int smp_call_function_map(void (*func) (void *info), void *info, int nonatomic,
         return ret;
 }
 
+static int __smp_call_function(void (*func)(void *info), void *info,
+                               int nonatomic, int wait)
+{
+        return smp_call_function_map(func,info,nonatomic,wait,cpu_online_map);
+}
+
 int smp_call_function(void (*func) (void *info), void *info, int nonatomic,
                         int wait)
 {
-        return smp_call_function_map(func,info,nonatomic,wait,cpu_online_map);
+        /* Can deadlock when called with interrupts disabled */
+        WARN_ON(irqs_disabled());
+
+        return __smp_call_function(func, info, nonatomic, wait);
 }
 EXPORT_SYMBOL(smp_call_function);
 
@@ -283,6 +284,9 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info, int
         cpumask_t map = CPU_MASK_NONE;
         int ret = 0;
 
+        /* Can deadlock when called with interrupts disabled */
+        WARN_ON(irqs_disabled());
+
         if (!cpu_online(cpu))
                 return -EINVAL;
 
@@ -299,6 +303,11 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info, int
 }
 EXPORT_SYMBOL(smp_call_function_single);
 
+void smp_send_stop(void)
+{
+        __smp_call_function(stop_this_cpu, NULL, 1, 0);
+}
+
 void smp_call_function_interrupt(void)
 {
         void (*func) (void *info);