[SPARC64]: Refine code sequences to get the cpu id.

On uniprocessor, it's always zero for optimize that.

On SMP, the jmpl to the stub kills the return address stack in the cpu
branch prediction logic, so expand the code sequence inline and use a
code patching section to fix things up.  This also always better and
explicit register selection, which will be taken advantage of in a
future changeset.

The hard_smp_processor_id() function is big, so do not inline it.

Fix up tests for Jalapeno to also test for Serrano chips too.  These
tests want "jbus Ultra-IIIi" cases to match, so that is what we should
test for.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index 3e48af2769d4..d069a6feb535 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -39,6 +39,7 @@
 #include <asm/cache.h>
 #include <asm/cpudata.h>
 #include <asm/auxio.h>
+#include <asm/head.h>
 
 #ifdef CONFIG_SMP
 static void distribute_irqs(void);
@@ -153,7 +154,8 @@ void enable_irq(unsigned int irq)
                 unsigned long ver;
 
                 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
-                if ((ver >> 32) == 0x003e0016) {
+                if ((ver >> 32) == __JALAPENO_ID ||
+                    (ver >> 32) == __SERRANO_ID) {
                         /* We set it to our JBUS ID. */
                         __asm__ __volatile__("ldxa [%%g0] %1, %0"
                                              : "=r" (tid)