[PATCH 05/11] powerpc/64: remove start_tb and accum_tb from thread_struct
From: Nicholas Piggin <npiggin@gmail.com>
Date: 2018-05-04 17:20:03
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
These fields are only written to. Signed-off-by: Nicholas Piggin <npiggin@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