linux-kernel - Re: [PATCH v7 4/5] file2alias.c: Implement builtin.alias generation

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Message-ID: <2c8c3839-f4cf-dc28-3865-99dabdf4b87d@csgroup.eu>
Date:   Sat, 17 Dec 2022 10:13:35 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Allen Webb <allenwebb@...gle.com>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v7 4/5] file2alias.c: Implement builtin.alias generation



Le 16/12/2022 à 23:17, Allen Webb a écrit :
> This populates the mod->modalias_buf with aliases for built-in modules
> when modpost is run against vmlinuz.o.
> 
> Signed-off-by: Allen Webb <allenwebb@...gle.com>
> ---
>   scripts/mod/file2alias.c | 55 +++++++++++++++++++++++++++-------------
>   1 file changed, 38 insertions(+), 17 deletions(-)
> 
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 458e41ae0f5f1..8ed08154b3d81 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -232,6 +232,8 @@ static void do_usb_entry(void *symval,
>   	add_wildcard(alias);
>   	buf_printf(&mod->dev_table_buf,
>   		   "MODULE_ALIAS(\"%s\");\n", alias);
> +	if (mod->builtin_name)
> +		buf_printf(&mod->modalias_buf, "alias %s %s\n", alias, mod->builtin_name);
>   }
>   
>   /* Handles increment/decrement of BCD formatted integers */
> @@ -376,9 +378,13 @@ static void do_of_entry_multi(void *symval, struct module *mod)
>   			*tmp = '_';
>   
>   	buf_printf(&mod->dev_table_buf, "MODULE_ALIAS(\"%s\");\n", alias);
> +	if (mod->builtin_name)
> +		buf_printf(&mod->modalias_buf, "alias %s %s\n", alias, mod->builtin_name);
>   	strcat(alias, "C");
>   	add_wildcard(alias);
>   	buf_printf(&mod->dev_table_buf, "MODULE_ALIAS(\"%s\");\n", alias);
> +	if (mod->builtin_name)
> +		buf_printf(&mod->modalias_buf, "alias %s %s\n", alias, mod->builtin_name);
>   }
>   
>   static void do_of_table(void *symval, unsigned long size,
> @@ -610,12 +616,18 @@ static void do_pnp_device_entry(void *symval, unsigned long size,
>   
>   		buf_printf(&mod->dev_table_buf,
>   			   "MODULE_ALIAS(\"pnp:d%s*\");\n", *id);
> +		if (mod->builtin_name)
> +			buf_printf(&mod->modalias_buf, "alias pnp:d%s* %s\n",
> +				   *id, mod->builtin_name);
>   
>   		/* fix broken pnp bus lowercasing */
>   		for (j = 0; j < sizeof(acpi_id); j++)
>   			acpi_id[j] = toupper((*id)[j]);
>   		buf_printf(&mod->dev_table_buf,
>   			   "MODULE_ALIAS(\"acpi*:%s:*\");\n", acpi_id);
> +		if (mod->builtin_name)
> +			buf_printf(&mod->modalias_buf, "alias acpi*:%s:* %s\n",
> +				   acpi_id, mod->builtin_name);
>   	}
>   }
>   
> @@ -662,19 +674,25 @@ static void do_pnp_card_entries(void *symval, unsigned long size,
>   			}
>   
>   			/* add an individual alias for every device entry */
> -			if (!dup) {
> -				char acpi_id[PNP_ID_LEN];
> -				int k;
> -
> -				buf_printf(&mod->dev_table_buf,
> -					   "MODULE_ALIAS(\"pnp:d%s*\");\n", id);
> -
> -				/* fix broken pnp bus lowercasing */
> -				for (k = 0; k < sizeof(acpi_id); k++)
> -					acpi_id[k] = toupper(id[k]);
> -				buf_printf(&mod->dev_table_buf,
> -					   "MODULE_ALIAS(\"acpi*:%s:*\");\n", acpi_id);
> -			}
> +			if (dup)
> +				continue;
> +			char acpi_id[PNP_ID_LEN];
> +			int k;

No declarations in the middle of a block. Put declarations before code.

> +
> +			buf_printf(&mod->dev_table_buf,
> +				   "MODULE_ALIAS(\"pnp:d%s*\");\n", id);
> +			if (mod->builtin_name)
> +				buf_printf(&mod->modalias_buf, "alias pnp:d%s* %s\n",
> +					   id, mod->builtin_name);
> +
> +			/* fix broken pnp bus lowercasing */
> +			for (k = 0; k < sizeof(acpi_id); k++)
> +				acpi_id[k] = toupper(id[k]);
> +			buf_printf(&mod->dev_table_buf,
> +				   "MODULE_ALIAS(\"acpi*:%s:*\");\n", acpi_id);
> +			if (mod->builtin_name)
> +				buf_printf(&mod->modalias_buf, "alias acpi*:%s:* %s\n",
> +					   acpi_id, mod->builtin_name);
>   		}
>   	}
>   }
> @@ -1476,10 +1494,13 @@ static void do_table(void *symval, unsigned long size,
>   	size -= id_size;
>   
>   	for (i = 0; i < size; i += id_size) {
> -		if (do_entry(mod->name, symval+i, alias)) {
> -			buf_printf(&mod->dev_table_buf,
> -				   "MODULE_ALIAS(\"%s\");\n", alias);
> -		}
> +		if (!do_entry(mod->name, symval + i, alias))
> +			continue;
> +		buf_printf(&mod->dev_table_buf, "MODULE_ALIAS(\"%s\");\n", alias);
> +		if (!mod->builtin_name)
> +			continue;
> +		buf_printf(&mod->modalias_buf, "alias %s %s\n", alias,
> +			   mod->builtin_name);
>   	}
>   }
>