[PATCH -hyperv 2/3] x86/hyperv: Use current_stack_pointer to avoid asm() in hv_hvcrash_ctxt_save()

Uros Bizjak
2026-03-11T10:27:25Z

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>
---
arch/x86/hyperv/hv_crash.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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();
--
2.53.0