linux-kernel - Re: [PATCH 2/2] x86/fred: Fix build with CONFIG_IA32

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Message-ID: <20240130153141.GEZbkWXQt2H3JHHGHx@fat_crate.local>
Date: Tue, 30 Jan 2024 16:31:41 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Li, Xin3" <xin3.li@...el.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
	"x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
	"luto@...nel.org" <luto@...nel.org>,
	"Shankar, Ravi V" <ravi.v.shankar@...el.com>,
	"andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>
Subject: Re: [PATCH 2/2] x86/fred: Fix build with CONFIG_IA32_EMULATION=n

On Tue, Jan 30, 2024 at 03:22:01PM +0000, Li, Xin3 wrote:
> How do you think?

Interesting. For some reason gcc doesn't constant-fold it away like
clang does.

> diff --git a/arch/x86/include/asm/ia32.h b/arch/x86/include/asm/ia32.h
> index c7ef6ea2fa99..01342d343c19 100644
> --- a/arch/x86/include/asm/ia32.h
> +++ b/arch/x86/include/asm/ia32.h
> @@ -81,7 +81,7 @@ static inline void ia32_disable(void)
> 
>  #else /* !CONFIG_IA32_EMULATION */
> 
> -static inline bool ia32_enabled(void)
> +static __always_inline bool ia32_enabled(void)
>  {
>  	return IS_ENABLED(CONFIG_X86_32);
>  }

Looks good to me. Lemme try it here.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette