linux-kernel - Re: [RFC PATCH v1 7/9] driver core: Add fw_devlink_unblock_may

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Date:   Mon, 30 May 2022 11:46:43 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kevin Hilman <khilman@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, Len Brown <lenb@...nel.org>,
        Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        John Stultz <jstultz@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Android Kernel Team <kernel-team@...roid.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
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        netdev <netdev@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [RFC PATCH v1 7/9] driver core: Add fw_devlink_unblock_may_probe()
 helper function

On Thu, May 26, 2022 at 1:22 PM Saravana Kannan <saravanak@...gle.com> wrote:
>
> This function can be used during the kernel boot sequence to forcefully
> override fw_devlink=on and unblock the probing of all devices that have
> a driver.
>
> It's mainly meant to be called from late_initcall() or
> late_initcall_sync() where a device needs to probe before the kernel can
> mount rootfs.

...

> diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
> index 9a81c4410b9f..0770edda7068 100644
> --- a/include/linux/fwnode.h
> +++ b/include/linux/fwnode.h
> @@ -13,6 +13,7 @@
>  #include <linux/list.h>
>  #include <linux/bits.h>
>  #include <linux/err.h>
> +#include <linux/init.h>
>
>  struct fwnode_operations;
>  struct device;
> @@ -199,5 +200,6 @@ extern bool fw_devlink_is_strict(void);
>  int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
>  void fwnode_links_purge(struct fwnode_handle *fwnode);
>  void fw_devlink_purge_absent_suppliers(struct fwnode_handle *fwnode);
> +void __init fw_devlink_unblock_may_probe(void);

I don't think you need init.h and __init here. Important is that you
have it in the C-file. Am I wrong?

-- 
With Best Regards,
Andy Shevchenko