[POWERPC] Make sure smp_processor_id works very early in boot

There's a small period early in boot where we don't know which cpu we're
running on. That's ok, except that it means we have no paca, or more
correctly that our paca pointer points somewhere random.

So that we can safely call things like smp_processor_id(), we need a paca,
so just assume we're on cpu 0. No code should _write_ to the paca before
we've set the correct one up.

We setup the proper paca after we've scanned the flat device tree in
early_setup(), so there's no need to do it again in start_here_common.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 3 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index f2fab687a01c..8cfd040d1f50 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -1583,9 +1583,6 @@ _GLOBAL(__start_initialization_multiplatform)
         /* Setup some critical 970 SPRs before switching MMU off */
         bl      .__970_cpu_preinit
 
-        /* cpu # */
-        li      r24,0
-
         /* Switch off MMU if not already */
         LOAD_REG_IMMEDIATE(r4, .__after_prom_start - KERNELBASE)
         add     r4,r4,r30
@@ -1946,14 +1943,6 @@ _STATIC(start_here_common)
         li      r3,0
         bl      .do_cpu_ftr_fixups
 
-        LOAD_REG_IMMEDIATE(r26, boot_cpuid)
-        lwz     r26,0(r26)
-
-        LOAD_REG_IMMEDIATE(r24, paca)   /* Get base vaddr of paca array  */
-        mulli   r13,r26,PACA_SIZE       /* Calculate vaddr of right paca */
-        add     r13,r13,r24             /* for this processor.           */
-        mtspr   SPRN_SPRG3,r13
-
         /* ptr to current */
         LOAD_REG_IMMEDIATE(r4, init_task)
         std     r4,PACACURRENT(r13)
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index a2fb2e627aad..175539c9afa0 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -177,6 +177,9 @@ void __init setup_paca(int cpu)
 
 void __init early_setup(unsigned long dt_ptr)
 {
+        /* Assume we're on cpu 0 for now. Don't write to the paca yet! */
+        setup_paca(0);
+
         /* Enable early debugging if any specified (see udbg.h) */
         udbg_early_init();