Linux Virtualization - Oct 2019 - [PATCH] x86/cpu/vmware: use the full form of inl in VMWARE_PORT

On 10/7/19 9:21 PM, Sami Tolvanen wrote:
> LLVM's assembler doesn't accept the short form inl (%%dx)
instruction,
> but instead insists on the output register to be explicitly specified:
>
>   <inline asm>:1:7: error: invalid operand for instruction
>           inl (%dx)
>              ^
>   LLVM ERROR: Error parsing inline asm
>
> Use the full form of the instruction to fix the build.
>
> Signed-off-by: Sami Tolvanen <samitolvanen at google.com>
Acked-by: Thomas Hellstrom <thellstrom at vmware.com>
> ---
>  arch/x86/kernel/cpu/vmware.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
> index 9735139cfdf8..46d732696c1c 100644
> --- a/arch/x86/kernel/cpu/vmware.c
> +++ b/arch/x86/kernel/cpu/vmware.c
> @@ -49,7 +49,7 @@
>  #define VMWARE_CMD_VCPU_RESERVED 31
>  
>  #define VMWARE_PORT(cmd, eax, ebx, ecx, edx)				\
> -	__asm__("inl (%%dx)" :						\
> +	__asm__("inl (%%dx), %%eax" :					\
>  		"=a"(eax), "=c"(ecx), "=d"(edx),
"=b"(ebx) :		\
>  		"a"(VMWARE_HYPERVISOR_MAGIC),				\
>  		"c"(VMWARE_CMD_##cmd),					\