[PATCH 05/11] powerpc/64: remove start_tb and accum_tb from thread_struct

[Nicholas Piggin]

These fields are only written to.

Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
 arch/powerpc/include/asm/processor.h | 4 ----
 arch/powerpc/kernel/process.c        | 6 +-----
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/arch/powerpc/include/asm/processor.h 
b/arch/powerpc/include/asm/processor.h
index c4b36a494a63..eff269adfa71 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -264,10 +264,6 @@ struct thread_struct {
        struct thread_fp_state  *fp_save_area;
        int             fpexc_mode;     /* floating-point exception mode */
        unsigned int    align_ctl;      /* alignment handling control */
-#ifdef CONFIG_PPC64
-       unsigned long   start_tb;       /* Start purr when proc switched in */
-       unsigned long   accum_tb;       /* Total accumulated purr for process */
-#endif
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
        struct perf_event *ptrace_bps[HBP_NUM];
        /*
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 1237f13fed51..ff7344d996e3 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1187,11 +1187,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
         */
        if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
                struct cpu_usage *cu = this_cpu_ptr(&cpu_usage_array);
-               long unsigned start_tb, current_tb;
-               start_tb = old_thread->start_tb;
-               cu->current_tb = current_tb = mfspr(SPRN_PURR);
-               old_thread->accum_tb += (current_tb - start_tb);
-               new_thread->start_tb = current_tb;
+               cu->current_tb = mfspr(SPRN_PURR);
        }
 #endif /* CONFIG_PPC64 */
 
-- 
2.17.0