Blackfin arch: SMP supporting patchset: Blackfin header files and machine common code

Blackfin dual core BF561 processor can support SMP like features.
https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like

In this patch, we provide SMP extend to Blackfin header files
and machine common code

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/blackfin/include/asm/processor.h b/arch/blackfin/include/asm/processor.h
index e3e9b41fa8db..30703c75030c 100644
--- a/arch/blackfin/include/asm/processor.h
+++ b/arch/blackfin/include/asm/processor.h
@@ -106,7 +106,8 @@ unsigned long get_wchan(struct task_struct *p);
         eip; })
 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->thread.usp)
 
-#define cpu_relax()     barrier()
+#define cpu_relax()     smp_mb()
+
 
 /* Get the Silicon Revision of the chip */
 static inline uint32_t __pure bfin_revid(void)
@@ -137,7 +138,11 @@ static inline uint32_t __pure bfin_revid(void)
 static inline uint16_t __pure bfin_cpuid(void)
 {
         return (bfin_read_CHIPID() & CHIPID_FAMILY) >> 12;
+}
 
+static inline uint32_t __pure bfin_dspid(void)
+{
+        return bfin_read_DSPID();
 }
 
 static inline uint32_t __pure bfin_compiled_revid(void)