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

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Date:   Sun, 5 Aug 2018 10:35:03 +0800
From:   gengdongjiu <gengdj.1984@...il.com>
To:     Will Deacon <will.deacon@....com>
Cc:     Dongjiu Geng <gengdongjiu@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        mark.rutland@....com, Len Brown <lenb@...nel.org>,
        rafael.j.wysocki@...el.com, erik.schmauss@...el.com,
        robert.moore@...el.com,
        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
Subject: Re: [PATCH] arm64: clean the additional checks before calling ghes_notify_sea()

2018-07-27 18:06 GMT+08:00 Will Deacon <will.deacon@....com>:
> On Thu, Jul 26, 2018 at 05:01:47PM -0400, Dongjiu Geng wrote:
>> In order to remove the additional check before calling the
>> ghes_notify_sea(), make stub definition when !CONFIG_ACPI_APEI_SEA.
>>
>> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
>> ---
>
> Acked-by: Will Deacon <will.deacon@....com>

Will,
     This patch will be applied, right? thanks

>
> Will
>
>> This cleanup is ever mentioned by Mark Rutland in [1]
>>
>> [1]:
>> https://lkml.org/lkml/2018/5/31/289
>> ---
>>  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
>>