linux-kernel - Re: [PATCH V3 1/4] x86: acpi: define uncached page flag

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Date:	Fri, 12 Jun 2015 09:52:44 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Matt Fleming <matt.fleming@...el.com>, fu.wei@...aro.org,
	al.stone@...aro.org, bp@...en8.de, tony.luck@...il.com,
	ying.huang@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 1/4] x86: acpi: define uncached page flag


* Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org> wrote:

> From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
> 
> This definition is used in APEI code when needing to map pages as
> uncached.
> 
> Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org>
> ---
>  arch/x86/include/asm/acpi.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
> index 3a45668f6dc3..6afb27682b00 100644
> --- a/arch/x86/include/asm/acpi.h
> +++ b/arch/x86/include/asm/acpi.h
> @@ -138,6 +138,10 @@ static inline void disable_acpi(void) { }
>  
>  #endif /* !CONFIG_ACPI */
>  
> +#ifdef	CONFIG_ACPI_APEI
> +#define ARCH_APEI_PAGE_KERNEL_UC (PAGE_KERNEL_NOCACHE)
> +#endif /*CONFIG_ACPI_APEI */

 - Why the tab?

 - Why the parentheses?

 - Why the closing comment block for a oneliner define? It's not like we forget 
   what it's about.

 - When the missing space in the closing comment?

That's 4 uglies in 3 lines of code, wow ...

Thanks,

	Ingo
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