linux-kernel - Re: [PATCH RESEND] driver core: export device_is

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Date:   Sun, 8 Nov 2020 09:23:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Dong Aisheng <aisheng.dong@....com>
Subject: Re: [PATCH RESEND] driver core: export device_is_bound() to fix
 build failure

On Sat, Nov 07, 2020 at 10:47:27PM +0000, Sudip Mukherjee wrote:
> When CONFIG_MXC_CLK_SCU is configured as 'm' the build fails as it
> is unable to find device_is_bound(). The error being:
> ERROR: modpost: "device_is_bound" [drivers/clk/imx/clk-imx-scu.ko]
> 	undefined!
> 
> Export the symbol so that the module finds it.
> 
> Fixes: 77d8f3068c63 ("clk: imx: scu: add two cells binding support")
> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
> ---
> 
> resending with the Fixes: tag.
> 
>  drivers/base/dd.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> index 148e81969e04..a796a57e5efb 100644
> --- a/drivers/base/dd.c
> +++ b/drivers/base/dd.c
> @@ -353,6 +353,7 @@ bool device_is_bound(struct device *dev)
>  {
>  	return dev->p && klist_node_attached(&dev->p->knode_driver);
>  }
> +EXPORT_SYMBOL(device_is_bound);

EXPORT_SYMBOL_GPL() please, like all the other exports in this file.

Also, wait, no, don't call this, are you sure you are calling it in a
race-free way?  And what branch/tree is the above commit in?

thanks,

greg k-h