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

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Date: Sat, 27 Jan 2024 01:37:27 -0800
From: Xin Li <xin3.li@...el.com>
To: linux-kernel@...r.kernel.org
Cc: tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	luto@...nel.org,
	ravi.v.shankar@...el.com,
	andrew.cooper3@...rix.com
Subject: [PATCH 1/2] x86/fred: Fix build with clang

As clang doesn't allow .fill to refernece a symbol before it's defined,
use asm_fred_entrypoint_user instead of asm_fred_entrypoint_kernel.

Fixes: 5e0636a41485 ("x86/fred: FRED entry/exit and dispatch code")
Reported-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/lkml/20240126100050.GAZbOC0g3Rlr6otZcT@fat_crate.local/
Signed-off-by: Xin Li <xin3.li@...el.com>
---
 arch/x86/entry/entry_64_fred.S | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

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
-- 
2.43.0