From: Uros Bizjak <ubizjak@gmail.com>
Date: Mon, 30 Mar 2026 08:59:21 +0000 (+0200)
Subject: x86/process/64: Use savesegment() in __show_regs() instead of inline asm
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=81310ce4287a23b8ff6e8684de73cfaae88782ca;p=thirdparty%2Fkernel%2Flinux.git

x86/process/64: Use savesegment() in __show_regs() instead of inline asm

Replace direct 'movl' instructions for DS, ES, FS, and GS read in
__show_regs() with the savesegment() helper. This improves
readability, consistency, and ensures proper handling of
segment registers on x86_64.

No functional change intended.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://patch.msgid.link/20260330085938.67985-2-ubizjak@gmail.com
---

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 08e72f4298701..b85e715ebb305 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -104,10 +104,10 @@ void __show_regs(struct pt_regs *regs, enum show_regs_mode mode,
 		return;
 	}
 
-	asm("movl %%ds,%0" : "=r" (ds));
-	asm("movl %%es,%0" : "=r" (es));
-	asm("movl %%fs,%0" : "=r" (fsindex));
-	asm("movl %%gs,%0" : "=r" (gsindex));
+	savesegment(ds, ds);
+	savesegment(es, es);
+	savesegment(fs, fsindex);
+	savesegment(gs, gsindex);
 
 	rdmsrq(MSR_FS_BASE, fs);
 	rdmsrq(MSR_GS_BASE, gs);