linux-kernel - Re: [PATCH] bus: brcmstb_gisb: Allow building as module

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Message-ID: <20211105025155.GA2922689@roeck-us.net>
Date:   Thu, 4 Nov 2021 19:51:55 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-kernel@...ts.infradead.org,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] bus: brcmstb_gisb: Allow building as module

On Fri, Sep 24, 2021 at 12:10:34PM -0700, Florian Fainelli wrote:
> Allow building the Broadcom STB GISB arbiter driver as a module, however
> similar to interrupt controller drivers, don't allow its unbind/removal
> since it is not quite prepared for that and we want it to catch bus
> errors all the time.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Hmm, did you actually test that ?

Building mips:allmodconfig ... failed
--------------
Error log:
<stdin>:1559:2: warning: #warning syscall futex_waitv not implemented [-Wcpp]
ERROR: modpost: "board_be_handler" [drivers/bus/brcmstb_gisb.ko] undefined!

Guenter

>  drivers/bus/Kconfig        | 2 +-
>  drivers/bus/brcmstb_gisb.c | 7 ++++++-
>  2 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig
> index a5b96f3aad67..9cfeae3fc244 100644
> --- a/drivers/bus/Kconfig
> +++ b/drivers/bus/Kconfig
> @@ -30,7 +30,7 @@ config ARM_INTEGRATOR_LM
>  	  found on the ARM Integrator AP (Application Platform)
>  
>  config BRCMSTB_GISB_ARB
> -	bool "Broadcom STB GISB bus arbiter"
> +	tristate "Broadcom STB GISB bus arbiter"
>  	depends on ARM || ARM64 || MIPS
>  	default ARCH_BRCMSTB || BMIPS_GENERIC
>  	help
> diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c
> index 6551286a60cc..4c2f7d61cb9b 100644
> --- a/drivers/bus/brcmstb_gisb.c
> +++ b/drivers/bus/brcmstb_gisb.c
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0-only
>  /*
> - * Copyright (C) 2014-2017 Broadcom
> + * Copyright (C) 2014-2021 Broadcom
>   */
>  
>  #include <linux/init.h>
> @@ -536,6 +536,7 @@ static struct platform_driver brcmstb_gisb_arb_driver = {
>  		.name	= "brcm-gisb-arb",
>  		.of_match_table = brcmstb_gisb_arb_of_match,
>  		.pm	= &brcmstb_gisb_arb_pm_ops,
> +		.suppress_bind_attrs = true,
>  	},
>  };
>  
> @@ -546,3 +547,7 @@ static int __init brcm_gisb_driver_init(void)
>  }
>  
>  module_init(brcm_gisb_driver_init);
> +
> +MODULE_AUTHOR("Broadcom");
> +MODULE_DESCRIPTION("Broadcom STB GISB arbiter driver");
> +MODULE_LICENSE("GPL v2");