linux-kernel - Re: [PATCH 1/2] Create UV efi

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Date:	Thu, 12 May 2016 08:46:06 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alex Thorlton <athorlton@....com>
Cc:	linux-kernel@...r.kernel.org, Dimitri Sivanich <sivanich@....com>,
	Russ Anderson <rja@....com>, Mike Travis <travis@....com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-efi@...r.kernel.org
Subject: Re: [PATCH 1/2] Create UV efi_call macros


* Alex Thorlton <athorlton@....com> wrote:

> +#define efi_call_virt(f, args...)					\
> +({									\
> +	efi_status_t __s;						\
> +	unsigned long flags;						\
> +	arch_efi_call_virt_setup();					\
> +	local_save_flags(flags);					\
> +	__s = arch_efi_call_virt(f, args);				\
> +	efi_call_virt_check_flags(flags, __stringify(f));		\
> +	arch_efi_call_virt_teardown();					\
> +	__s;								\
> +})
> +
> +#define __efi_call_virt(f, args...)					\
> +({									\
> +	unsigned long flags;						\
> +	arch_efi_call_virt_setup();					\
> +	local_save_flags(flags);					\
> +	arch_efi_call_virt(f, args);					\
> +	efi_call_virt_check_flags(flags, __stringify(f));		\
> +	arch_efi_call_virt_teardown();					\
> +})
> +
> +#define uv_call_virt(f, args...)					\
> +({									\
> +	efi_status_t __s;						\
> +	unsigned long flags;						\
> +	arch_efi_call_virt_setup();					\
> +	local_save_flags(flags);					\
> +	__s = uv_efi_call_virt(f, args);				\
> +	efi_call_virt_check_flags(flags, __stringify(f));		\
> +	arch_efi_call_virt_teardown();					\
> +	__s;								\
> +})

Btw., a very (very!) small stylistic nit that caught my eyes, and I realize that 
you just moved code, but could you please improve these macros a bit and make it 
look like regular kernel code? I.e. something like:

#define efi_call_virt(f, args...)					\
({									\
	efi_status_t __s;						\
	unsigned long flags;						\
									\
	arch_efi_call_virt_setup();					\
									\
	local_save_flags(flags);					\
	__s = arch_efi_call_virt(f, args);				\
	efi_call_virt_check_flags(flags, __stringify(f));		\
	arch_efi_call_virt_teardown();					\
									\
	__s;								\
})

This delineates the various blocks of code: variables, setup, the saving/calling 
block plus the return code.

(Assuming the EFI folks like the whole approach.)

Thanks,

	Ingo