linux-kernel - Re: [PATCH v3 02/22] x86,mce: Delete ist_begin_non

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Message-ID: <20200219171309.GC32346@zn.tnic>
Date:   Wed, 19 Feb 2020 18:13:09 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        rostedt@...dmis.org, mingo@...nel.org, joel@...lfernandes.org,
        gregkh@...uxfoundation.org, gustavo@...eddedor.com,
        tglx@...utronix.de, paulmck@...nel.org, josh@...htriplett.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        luto@...nel.org, tony.luck@...el.com, frederic@...nel.org,
        dan.carpenter@...cle.com, mhiramat@...nel.org
Subject: Re: [PATCH v3 02/22] x86,mce: Delete ist_begin_non_atomic()

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.

https://people.kernel.org/tglx/notes-about-netiquette