[PATCH] ARM: setup_mm_for_reboot(): use flush_cache_louis()

[Nicolas Pitre]

... instead of flush_cache_all().  The later unconditionally flushes
the L2 cache on ARMv7 architectures such as Cortex A15 and A7 which
is costly and unnecessary in some scenarios where setup_mm_for_reboot()
is used.  If L2 has to be flushed as well, it should already be done
separately on other architectures anyway.

Signed-off-by: Nicolas Pitre <nico at linaro.org>

diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
index ab88ed4f8e..2c61085a10 100644
--- a/arch/arm/mm/idmap.c
+++ b/arch/arm/mm/idmap.c
@@ -104,7 +104,7 @@ early_initcall(init_static_idmap);
 void setup_mm_for_reboot(void)
 {
 	/* Clean and invalidate L1. */
-	flush_cache_all();
+	flush_cache_louis();
 
 	/* Switch to the identity mapping. */
 	cpu_switch_mm(idmap_pgd, &init_mm);