sh: smp: shove a cpu_relax() in the plat_start_cpu() busy loop.

Without this, certain versions of GCC will happily optimize the entire
loop out.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/sh/kernel/cpu/sh4a/smp-shx3.c b/arch/sh/kernel/cpu/sh4a/smp-shx3.c
index edb4da037e0c..b8869aa20dec 100644
--- a/arch/sh/kernel/cpu/sh4a/smp-shx3.c
+++ b/arch/sh/kernel/cpu/sh4a/smp-shx3.c
@@ -82,7 +82,7 @@ void plat_start_cpu(unsigned int cpu, unsigned long entry_point)
                 ctrl_outl(STBCR_MSTP, STBCR_REG(cpu));
 
         while (!(ctrl_inl(STBCR_REG(cpu)) & STBCR_MSTP))
-                ;
+                cpu_relax();
 
         /* Start up secondary processor by sending a reset */
         ctrl_outl(STBCR_AP_VAL, STBCR_REG(cpu));