linux-kernel - Re: [RFC PATCH v3 05/15] powerpc/irq: Add helpers to get and set regs->softe

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Date:   Tue, 07 Apr 2020 10:50:20 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Michael Ellerman <mpe@...erman.id.au>, msuchanek@...e.de,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v3 05/15] powerpc/irq: Add helpers to get and set
 regs->softe

Christophe Leroy's on April 7, 2020 4:16 am:
> regs->softe doesn't exist on PPC32.
> 
> Add helpers to get and set regs->softe.
> Those helpers will void on PPC32.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>  arch/powerpc/include/asm/hw_irq.h | 21 +++++++++++++++++++--
>  1 file changed, 19 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
> index e0e71777961f..e69466867d5f 100644
> --- a/arch/powerpc/include/asm/hw_irq.h
> +++ b/arch/powerpc/include/asm/hw_irq.h
> @@ -39,6 +39,8 @@
>  #define PACA_IRQ_MUST_HARD_MASK	(PACA_IRQ_EE)
>  #endif
>  
> +#endif /* CONFIG_PPC64 */
> +
>  /*
>   * flags for paca->irq_soft_mask
>   */
> @@ -47,8 +49,6 @@
>  #define IRQS_PMI_DISABLED	2
>  #define IRQS_ALL_DISABLED	(IRQS_DISABLED | IRQS_PMI_DISABLED)
>  
> -#endif /* CONFIG_PPC64 */
> -
>  #ifndef __ASSEMBLY__
>  
>  extern void replay_system_reset(void);
> @@ -282,6 +282,15 @@ extern void irq_set_pending_from_srr1(unsigned long srr1);
>  
>  extern void force_external_irq_replay(void);
>  
> +static inline unsigned long get_softe(struct pt_regs *regs)
> +{
> +	return regs->softe;
> +}
> +
> +static inline void set_softe(struct pt_regs *regs, unsigned long val)
> +{
> +	regs->softe = val;
> +}
>  #else /* CONFIG_PPC64 */
>  
>  static inline unsigned long arch_local_save_flags(void)
> @@ -350,6 +359,14 @@ static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
>  
>  static inline void may_hard_irq_enable(void) { }
>  
> +static inline unsigned long get_softe(struct pt_regs *regs)
> +{
> +	return 0;
> +}
> +
> +static inline void set_softe(struct pt_regs *regs, unsigned long val)
> +{
> +}

If this goes into a general shared header, I would prefer if we could
do something a bit more general (at least with the name).

I think get_softe() could just be replaced with arch_irq_disabled_regs().

For set, could we call it irq_soft_mask_regs_set_state()? 32 has no soft
mask state in regs, so it's more obvious that it's a no-op. Or you could
make 32-bit version a BUG(), and then always guard it with IS_ENABLED().

Thanks,
Nick