sh: Only invalidate the I-cache range for secondary CPUs stack_start.

Secondary CPUs already take care of the D-cache bits through the common
cache initialization path, and the only thing that is necessary after
twiddling around with stack_start is ensuring that the I-cache changes
are visible (particularly since this tends to be the only part lacking
coherency).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index 442d8d4..6a27c65 100644 (file)
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -120,7 +120,9 @@ int __cpuinit __cpu_up(unsigned int cpu)
        stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
        stack_start.start_kernel_fn = start_secondary;
 
-       flush_cache_all();
+       flush_icache_range((unsigned long)&stack_start,
+                          (unsigned long)&stack_start + sizeof(stack_start));
+       wmb();
 
        plat_start_cpu(cpu, (unsigned long)_stext);