On 30.09.2025 01:36, Jason Andryuk wrote:
> On 2025-09-25 06:48, Jan Beulich wrote:
>> --- a/xen/arch/x86/include/asm/spec_ctrl.h
>> +++ b/xen/arch/x86/include/asm/spec_ctrl.h
>> @@ -73,7 +73,7 @@ static always_inline void spec_ctrl_new_
>>
>> /* (ab)use alternative_input() to specify clobbers. */
>> alternative_input("", "DO_OVERWRITE_RSB xu=%=", X86_BUG_IBPB_NO_RET,
>> - : "rax", "rcx");
>> + "i" (0) : "rax", "rcx");
>
> "i" (0) is to work around the trailing comma in alternative_input() and
> does nothing?
Yes. If more such "uses" appeared, we may want to introduce some kind of
abstraction.
Jan
