Subject: Re: [RFC PATCH 06/12] [WIP] powerpc/tm: Remove dead code from __switch_to_tm()

From: Michael Neuling <[email-masked]>
Date: Tue, 20 Feb 2018 13:52:05 +1100

Not sure I understand this.. should it be merged with the last patch?

Needs a comment here.

On Tue, 2018-02-20 at 11:22 +1100, Cyril Bur wrote:
> ---
>  arch/powerpc/kernel/process.c | 24 +++++-------------------
>  1 file changed, 5 insertions(+), 19 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
> index ea75da0fd506..574b05fe7d66 100644
> --- a/arch/powerpc/kernel/process.c
> +++ b/arch/powerpc/kernel/process.c
> @@ -1027,27 +1027,13 @@ static inline void __switch_to_tm(struct task_struct *prev,
>  		struct task_struct *new)
>  {
>  	/*
> -	 * So, with the rework none of this code should not be needed.
> -	 * I've left in the reclaim for now. This *should* save us
> -	 * from any mistake in the new code. Also the
> -	 * enabling/disabling logic of MSR_TM really should be
> +	 * The enabling/disabling logic of MSR_TM really should be
>  	 * refactored into a common way with MSR_{FP,VEC,VSX}
>  	 */
> -	if (cpu_has_feature(CPU_FTR_TM)) {
> -		if (tm_enabled(prev) || tm_enabled(new))
> -			tm_enable();
> -
> -		if (tm_enabled(prev)) {
> -			prev->thread.load_tm++;
> -			tm_reclaim_task(prev);
> -			/*
> -			 * The disabling logic may be confused don't
> -			 * disable for now
> -			 *
> -			 * if (!MSR_TM_ACTIVE(prev->thread.regs->msr) && prev->thread.load_tm == 0)
> -			 *	prev->thread.regs->msr &= ~MSR_TM;
> -			 */
> -		}
> +	if (cpu_has_feature(CPU_FTR_TM) && tm_enabled(prev)) {
> +		prev->thread.load_tm++;
> +		if (!MSR_TM_ACTIVE(prev->thread.regs->msr) && prev->thread.load_tm == 0)
> +			prev->thread.regs->msr &= ~MSR_TM;
>  	}
>  }
>