linux-kernel - RE: [PATCH 1/2] x86/fred: Fix build with clang

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Message-ID: <SA1PR11MB6734916F2BB7E296A6FEE52EA8782@SA1PR11MB6734.namprd11.prod.outlook.com>
Date: Sat, 27 Jan 2024 19:46:21 +0000
From: "Li, Xin3" <xin3.li@...el.com>
To: "H. Peter Anvin" <hpa@...or.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: "tglx@...utronix.de" <tglx@...utronix.de>, "mingo@...hat.com"
	<mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>,
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "x86@...nel.org"
	<x86@...nel.org>, "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 1/2] x86/fred: Fix build with clang

> >diff --git a/arch/x86/entry/entry_64_fred.S
> >b/arch/x86/entry/entry_64_fred.S index eedf98de7538..5427e0da190d
> >100644
> >--- a/arch/x86/entry/entry_64_fred.S
> >+++ b/arch/x86/entry/entry_64_fred.S
> >@@ -43,13 +43,12 @@ SYM_INNER_LABEL(asm_fred_exit_user,
> SYM_L_GLOBAL)
> > 	_ASM_EXTABLE_TYPE(1b, asm_fred_entrypoint_user, EX_TYPE_ERETU)
> > SYM_CODE_END(asm_fred_entrypoint_user)
> >
> >-.fill asm_fred_entrypoint_kernel - ., 1, 0xcc
> >-
> > /*
> >  * The new RIP value that FRED event delivery establishes is
> >  * (IA32_FRED_CONFIG & ~FFFH) + 256 for events that occur in
> >  * ring 0, i.e., asm_fred_entrypoint_user + 256.
> >  */
> >+	.fill asm_fred_entrypoint_user + 256 - ., 1, 0xcc
> > 	.org asm_fred_entrypoint_user + 256
> > SYM_CODE_START_NOALIGN(asm_fred_entrypoint_kernel)
> > 	FRED_ENTER
> 
> .fill and .org here are redundant; in fact, there two directives mean exactly the
> same thing except that .org implicitly subtracts the current offset.

Ah, right, .fill already does the job!

I will remove .org.