linux-kernel - [PATCH v8 8/9] file2alias.c: Implement builtin.alias generation

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Date:   Mon, 19 Dec 2022 13:18:54 -0600
From:   Allen Webb <allenwebb@...gle.com>
To:     "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>,
        Allen Webb <allenwebb@...gle.com>
Subject: [PATCH v8 8/9] file2alias.c: Implement builtin.alias generation

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 e41ff8de7a876..e840cb51281a4 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);
 	}
 }
 
@@ -637,6 +649,8 @@ static void do_pnp_card_entries(void *symval, unsigned long size,
 			const char *id = (char *)(*devs)[j].id;
 			int i2, j2;
 			int dup = 0;
+			char acpi_id[PNP_ID_LEN];
+			int k;
 
 			if (!id[0])
 				break;
@@ -662,19 +676,23 @@ 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;
+
+			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);
 	}
 }
 
-- 
2.37.3