From: Uros Bizjak <ubizjak@gmail.com>
Date: Wed, 11 Mar 2026 10:25:59 +0000 (+0100)
Subject: x86/hyperv: Use current_stack_pointer to avoid asm() in hv_hvcrash_ctxt_save()
X-Git-Tag: v7.0-rc5~26^2~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2536091d585ac0b60ccf80cbe7a0bf4bfb75ec00;p=thirdparty%2Flinux.git

x86/hyperv: Use current_stack_pointer to avoid asm() in hv_hvcrash_ctxt_save()

Use current_stack_pointer to avoid asm() when saving %rsp to the
crash context memory in hv_hvcrash_ctxt_save(). The new code is
more readable and results in exactly the same object file.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Long Li <longli@microsoft.com>
Cc: Thomas Gleixner <tglx@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
---

diff --git a/arch/x86/hyperv/hv_crash.c b/arch/x86/hyperv/hv_crash.c
index 2c7ea7e70854..d0f95a278fdb 100644
--- a/arch/x86/hyperv/hv_crash.c
+++ b/arch/x86/hyperv/hv_crash.c
@@ -199,7 +199,7 @@ static void hv_hvcrash_ctxt_save(void)
 {
 	struct hv_crash_ctxt *ctxt = &hv_crash_ctxt;
 
-	asm volatile("movq %%rsp,%0" : "=m"(ctxt->rsp));
+	ctxt->rsp = current_stack_pointer;
 
 	ctxt->cr0 = native_read_cr0();
 	ctxt->cr4 = native_read_cr4();