Re: [PATCH v3 02/22] x86,mce: Delete ist_begin_non_atomic()

Borislav Petkov
2020-02-19T17:13:18Z

On Wed, Feb 19, 2020 at 03:47:26PM +0100, Peter Zijlstra wrote:
> Subject: Re: [PATCH v3 02/22] x86,mce: Delete ist_begin_non_atomic()

x86/mce: ...

> It is an abomination; and in prepration of removing the whole
> ist_enter() thing, it needs to go.
>
> Convert #MC over to using task_work_add() instead; it will run the
> same code slightly later, on the return to user path of the same
> exception.

That's fine because the error happened in userspace.

...

> @@ -1202,6 +1186,29 @@ static void __mc_scan_banks(struct mce *
> *m = *final;
> }
>
> +static void mce_kill_me_now(struct callback_head *ch)
> +{
> + force_sig(SIGBUS);
> +}
> +
> +static void mce_kill_me_maybe(struct callback_head *cb)

You don't even need the "mce_" prefixes - those are static functions and
in mce-land.

Change looks good otherwise.

--
Regards/Gruss,
Boris.