Re: [PATCH] x86/mce: fix a wrong assignment of i_mce.status

[Luck, Tony]

+Yazen

On Thu, Jun 11, 2020 at 10:32:38AM +0800, Zhenzhong Duan wrote:
> The original code is a nop as i_mce.status is or'ed with part of itself,
> fix it.
> 
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxx>
> ---
>  arch/x86/kernel/cpu/mce/inject.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/mce/inject.c b/arch/x86/kernel/cpu/mce/inject.c
> index 3413b41..dc28a61 100644
> --- a/arch/x86/kernel/cpu/mce/inject.c
> +++ b/arch/x86/kernel/cpu/mce/inject.c
> @@ -511,7 +511,7 @@ static void do_inject(void)
>  	 */
>  	if (inj_type == DFR_INT_INJ) {
>  		i_mce.status |= MCI_STATUS_DEFERRED;
> -		i_mce.status |= (i_mce.status & ~MCI_STATUS_UC);
> +		i_mce.status &= ~MCI_STATUS_UC;

Boris: "git blame" says you wrote this code. Patch looks right (in
that it makes the code do what the comment just above says it is trying
to do):

         * - MCx_STATUS[UC] cleared: deferred errors are _not_ UC

But this is AMD specific, so I'll defer judgement

-Tony