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Commit 36d632ea authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64: remove start_tb and accum_tb from thread_struct 



These fields are only written to.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 54071e41

arch/powerpc/include/asm/processor.h

+0 −4
Original line number Diff line number Diff line
@@ -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];

	/*

arch/powerpc/kernel/process.c

+1 −5
Original line number Diff line number Diff line
@@ -1188,11 +1188,7 @@ 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 */