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

[Uros Bizjak]

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@xxxxxxxxx>
Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu@xxxxxxxxxx>
Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>
Cc: Long Li <longli@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
---
 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