linux-kernel - Re: [PATCH] zcrypt: handle AP Info notification from CHSC SEI command

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Message-Id: <alpine.LFD.2.21.1901301912380.2372@schleppi>
Date:   Wed, 30 Jan 2019 19:32:53 +0100 (CET)
From:   Sebastian Ott <sebott@...ux.ibm.com>
To:     Tony Krowiak <akrowiak@...ux.ibm.com>
cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        oberpar@...ux.ibm.com, freude@...ux.ibm.com, pmorel@...ux.ibm.com,
        pasic@...ux.ibm.com, cohuck@...hat.com
Subject: Re: [PATCH] zcrypt: handle AP Info notification from CHSC SEI
 command

On Wed, 30 Jan 2019, Tony Krowiak wrote:
> +#if IS_ENABLED(CONFIG_ZCRYPT)
> +void ap_bus_cfg_chg(void);
> +#else
> +#error "no CONFIG_ZCRYPT"
   ^
I don't think that's the right thing to do here.


> +++ b/drivers/s390/cio/chsc.h
> @@ -9,6 +9,7 @@
>  #include <asm/chsc.h>
>  #include <asm/schid.h>
>  #include <asm/qdio.h>
> +#include <asm/ap.h>

This should be moved to chsc.c


> +++ b/drivers/s390/crypto/ap_bus.c
> @@ -35,6 +35,7 @@
>  #include <linux/mod_devicetable.h>
>  #include <linux/debugfs.h>
>  #include <linux/ctype.h>
> +#include <asm/crw.h>

This is not needed here.


>  /*
> +* A config change has happened, Force an ap bus rescan.
> +*/
> +void ap_bus_cfg_chg(void)
> +{
> +	AP_DBF(DBF_INFO, "%s config change, forcing bus rescan\n", __func__);
> +
> +	ap_bus_force_rescan();
> +}
> +EXPORT_SYMBOL(ap_bus_cfg_chg);

There is no need for the export symbol - you don't call that function
from module code.
As an unrelated question, just to be sure: ap_bus.c is compiled as
built-in even with ZCRYPT=m, right?

Reviewed-by: Sebastian Ott <sebott@...ux.ibm.com>

Regards,
Sebastian