[kvm-unit-tests PATCH] x86: remove memory constraint from "mov" instruction

Bill Wendling
2019-09-09T21:21:38Z

The "mov" instruction to get the error code shouldn't move into a memory
location. Don't allow the compiler to make this decision. Instead
specify that only a register is appropriate here.

Signed-off-by: Bill Wendling <morbo@google.com>
---
lib/x86/desc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/x86/desc.c b/lib/x86/desc.c
index 5f37cef..451f504 100644
--- a/lib/x86/desc.c
+++ b/lib/x86/desc.c
@@ -263,7 +263,7 @@ unsigned exception_error_code(void)
{
unsigned short error_code;

- asm("mov %%gs:6, %0" : "=rm"(error_code));
+ asm("mov %%gs:6, %0" : "=r"(error_code));
return error_code;
}