linux-kernel - Re: [PATCH RESEND v2] arm64: clean the additional checks before calling ghes_notify

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Date:   Thu, 9 Aug 2018 20:32:45 +0800
From:   gengdongjiu <gengdj.1984@...il.com>
To:     Dongjiu Geng <gengdongjiu@...wei.com>
Cc:     Borislav Petkov <bp@...e.de>, Will Deacon <will.deacon@....com>,
        rafael.j.wysocki@...el.com, James Morse <james.morse@....com>,
        Tyler Baicar <tbaicar@...eaurora.org>,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-acpi@...r.kernel.org, devel@...ica.org, linuxarm@...wei.com
Subject: Re: [PATCH RESEND v2] arm64: clean the additional checks before
 calling ghes_notify_sea()

CC Borislav


2018-08-08 0:26 GMT+08:00 Dongjiu Geng <gengdongjiu@...wei.com>:
> In order to remove the additional check before calling the
> ghes_notify_sea(), make stub definition when !CONFIG_ACPI_APEI_SEA.
>
> After this cleanup, we can simply call the ghes_notify_sea() to let
> APEI driver handle the SEA notification.
>
> CC: Tyler Baicar <tbaicar@...eaurora.org>
> CC: James Morse <james.morse@....com>
> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
> Acked-by: Will Deacon <will.deacon@....com>
> ---
> This cleanup is ever mentioned by Mark Rutland in [1]
>
> [1]:
> https://lkml.org/lkml/2018/5/31/289
>
> Change since v1:
> 1. Update the commit messages
> 2. CC Tyler and James
> 3. Add Acked-by of Will
> ---
>  arch/arm64/mm/fault.c | 7 +------
>  include/acpi/ghes.h   | 4 ++++
>  2 files changed, 5 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index b8eecc7..9ffe01d 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -727,12 +727,7 @@ static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)
>
>  int handle_guest_sea(phys_addr_t addr, unsigned int esr)
>  {
> -       int ret = -ENOENT;
> -
> -       if (IS_ENABLED(CONFIG_ACPI_APEI_SEA))
> -               ret = ghes_notify_sea();
> -
> -       return ret;
> +       return ghes_notify_sea();
>  }
>
>  asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 1624e2b..82cb4eb 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -118,6 +118,10 @@ static inline void *acpi_hest_get_next(struct acpi_hest_generic_data *gdata)
>              (void *)section - (void *)(estatus + 1) < estatus->data_length; \
>              section = acpi_hest_get_next(section))
>
> +#ifdef CONFIG_ACPI_APEI_SEA
>  int ghes_notify_sea(void);
> +#else
> +static inline int ghes_notify_sea(void) { return -ENOENT; }
> +#endif
>
>  #endif /* GHES_H */
> --
> 1.9.1
>