From: Uros Bizjak <ubizjak@gmail.com>
Date: Mon, 30 Mar 2026 05:57:44 +0000 (+0200)
Subject: x86/asm/segment: Use ASM_INPUT_RM in __loadsegment_fs()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=caf3cb2ef22e4b4ff9f6bb48f71ce30dae663326;p=thirdparty%2Flinux.git

x86/asm/segment: Use ASM_INPUT_RM in __loadsegment_fs()

Use the ASM_INPUT_RM macro in __loadsegment_fs() to work around Clang
problems with the "rm" asm constraint. Clang seems to always chose the
memory input, while it is almost always the worst choice.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Nathan Chancellor <nathan@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Link: https://patch.msgid.link/20260330055823.5793-3-ubizjak@gmail.com
---

diff --git a/arch/x86/include/asm/segment.h b/arch/x86/include/asm/segment.h
index 3fe3a310844c4..0f4283dcd0c4a 100644
--- a/arch/x86/include/asm/segment.h
+++ b/arch/x86/include/asm/segment.h
@@ -335,7 +335,7 @@ static inline void __loadsegment_fs(unsigned short value)
 
 		     _ASM_EXTABLE_TYPE(1b, 2b, EX_TYPE_CLEAR_FS)
 
-		     : : "rm" (value) : "memory");
+		     : : ASM_INPUT_RM (value) : "memory");
 }
 
 /* __loadsegment_gs is intentionally undefined.  Use load_gs_index instead. */