[PATCH 2/2] MIPS: c-r4k: Do not SMP function call during kexec

[Florian Fainelli <f.fainelli@gmail.com>]

On SMP r4k cache style systems, we cannot issue a
smp_function_call_many() like what __flush_cache_all() does *after* we
have disabled interrupts for the calling CPU. Add a special check, and
do a local cache operation instead.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 arch/mips/mm/c-r4k.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index e7f798d55fbc..ea2998f1f5c5 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -19,6 +19,7 @@
 #include <linux/mm.h>
 #include <linux/export.h>
 #include <linux/bitops.h>
+#include <linux/kexec.h>
 
 #include <asm/bcache.h>
 #include <asm/bootinfo.h>
@@ -494,7 +495,10 @@ static inline void local_r4k___flush_cache_all(void * args)
 
 static void r4k___flush_cache_all(void)
 {
-	r4k_on_each_cpu(R4K_INDEX, local_r4k___flush_cache_all, NULL);
+	if (!kexec_in_progress)
+		r4k_on_each_cpu(R4K_INDEX, local_r4k___flush_cache_all, NULL);
+	else
+		local_r4k___flush_cache_all(NULL);
 }
 
 /**
-- 
2.9.3