[PATCH v11 2/9] powerpc: Only use task_struct 'cpu' field on SMP

[Christophe Leroy]

When moving to CONFIG_THREAD_INFO_IN_TASK, the thread_info 'cpu' field
gets moved into task_struct and only defined when CONFIG_SMP is set.

This patch ensures that TI_CPU is only used when CONFIG_SMP is set and
that task_struct 'cpu' field is not used directly out of SMP code.

Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
Reviewed-by: Nicholas Piggin <npig...@gmail.com>
---
 arch/powerpc/kernel/head_fsl_booke.S | 2 ++
 arch/powerpc/kernel/misc_32.S        | 4 ++++
 arch/powerpc/xmon/xmon.c             | 2 +-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/head_fsl_booke.S 
b/arch/powerpc/kernel/head_fsl_booke.S
index e2750b856c8f..05b574f416b3 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -243,8 +243,10 @@ set_ivor:
        li      r0,0
        stwu    r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
 
+#ifdef CONFIG_SMP
        CURRENT_THREAD_INFO(r22, r1)
        stw     r24, TI_CPU(r22)
+#endif
 
        bl      early_init
 
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 57d2ffb2d45c..02b8cdd73792 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -183,10 +183,14 @@ _GLOBAL(low_choose_750fx_pll)
        or      r4,r4,r5
        mtspr   SPRN_HID1,r4
 
+#ifdef CONFIG_SMP
        /* Store new HID1 image */
        CURRENT_THREAD_INFO(r6, r1)
        lwz     r6,TI_CPU(r6)
        slwi    r6,r6,2
+#else
+       li      r6, 0
+#endif
        addis   r6,r6,nap_save_hid1@ha
        stw     r4,nap_save_hid1@l(r6)
 
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 372f4d80bcd6..5e5e44dcbf89 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -2997,7 +2997,7 @@ static void show_task(struct task_struct *tsk)
        printf("%px %016lx %6d %6d %c %2d %s\n", tsk,
                tsk->thread.ksp,
                tsk->pid, rcu_dereference(tsk->parent)->pid,
-               state, task_thread_info(tsk)->cpu,
+               state, task_cpu(tsk),
                tsk->comm);
 }
 
-- 
2.13.3