linux-kernel - Re: [PATCH v2 1/2] modpost: file2alias: fixup mdio alias garbled code in modules.alias

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Date:   Fri, 26 Nov 2021 11:21:03 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Yinbo Zhu <zhuyinbo@...ngson.cn>, Andrew Lunn <andrew@...n.ch>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v2 1/2] modpost: file2alias: fixup mdio alias garbled code
 in modules.alias

On 26.11.2021 10:45, Yinbo Zhu wrote:
> After module compilation, module alias mechanism will generate a ugly
> mdio modules alias configure if ethernet phy was selected, this patch
> is to fixup mdio alias garbled code.
> 
> In addition, that ugly alias configure will cause ethernet phy module
> doens't match udev, phy module auto-load is fail, but add this patch
> that it is well mdio driver alias configure match phy device uevent.
> 
I think Andrew asked you for an example already.
For which PHY's the driver isn't auto-loaded?

In addition your commit descriptions are hard to read, especially the
one for patch 2. Could you please try to change them to proper English?
Not being a native speaker myself ..

> Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
> ---
> Change in v2:
> 		Add a MDIO_ANY_ID for considering some special phy device 
> 		which phy id doesn't be read from phy register.
> 
> 
>  include/linux/mod_devicetable.h |  2 ++
>  scripts/mod/file2alias.c        | 17 +----------------
>  2 files changed, 3 insertions(+), 16 deletions(-)
> 
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index ae2e75d..7bd23bf 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -595,6 +595,8 @@ struct platform_device_id {
>  	kernel_ulong_t driver_data;
>  };
>  
> +#define MDIO_ANY_ID (~0)
> +
>  #define MDIO_NAME_SIZE		32
>  #define MDIO_MODULE_PREFIX	"mdio:"
>  
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 49aba86..63f3149 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -1027,24 +1027,9 @@ static int do_platform_entry(const char *filename,
>  static int do_mdio_entry(const char *filename,
>  			 void *symval, char *alias)
>  {
> -	int i;
>  	DEF_FIELD(symval, mdio_device_id, phy_id);
> -	DEF_FIELD(symval, mdio_device_id, phy_id_mask);
> -
>  	alias += sprintf(alias, MDIO_MODULE_PREFIX);
> -
> -	for (i = 0; i < 32; i++) {
> -		if (!((phy_id_mask >> (31-i)) & 1))
> -			*(alias++) = '?';
> -		else if ((phy_id >> (31-i)) & 1)
> -			*(alias++) = '1';
> -		else
> -			*(alias++) = '0';
> -	}
> -
> -	/* Terminate the string */
> -	*alias = 0;
> -
> +	ADD(alias, "p", phy_id != MDIO_ANY_ID, phy_id);
>  	return 1;
>  }
>  
>