linux-kernel - [PATCH 1/4 v2] init: move string constants to _

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Date:   Mon, 10 Feb 2020 06:45:02 -0800
From:   Mark Salyzyn <salyzyn@...roid.com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...roid.com, Mark Salyzyn <salyzyn@...roid.com>,
        "Theodore Ts'o" <tytso@....edu>, Kees Cook <keescook@...omium.org>
Subject: [PATCH 1/4 v2] init: move string constants to __initconst section

A space-saving measure is to move string constants to __initconst.

Signed-off-by: Mark Salyzyn <salyzyn@...roid.com>
Cc: linux-kernel@...r.kernel.org
Cc: kernel-team@...roid.com
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: Kees Cook <keescook@...omium.org>
---
 init/main.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/init/main.c b/init/main.c
index cc0ee4873419c..a58b72c9433e7 100644
--- a/init/main.c
+++ b/init/main.c
@@ -524,24 +524,27 @@ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
  * parsing is performed in place, and we should allow a component to
  * store reference of name/value for future reference.
  */
+static const char alloc_fail_msg[] __initconst =
+	"%s: Failed to allocate %zu bytes\n";
 static void __init setup_command_line(char *command_line)
 {
 	size_t len, xlen = 0, ilen = 0;
+	static const char argsep_str[] __initconst = " -- ";
 
 	if (extra_command_line)
 		xlen = strlen(extra_command_line);
 	if (extra_init_args)
-		ilen = strlen(extra_init_args) + 4; /* for " -- " */
+		ilen = strlen(extra_init_args) + strlen(argsep_str);
 
 	len = xlen + strlen(boot_command_line) + 1;
 
 	saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
 	if (!saved_command_line)
-		panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
+		panic(alloc_fail_msg, __func__, len + ilen);
 
 	static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
 	if (!static_command_line)
-		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+		panic(alloc_fail_msg, __func__, len);
 
 	if (xlen) {
 		/*
@@ -562,9 +565,9 @@ static void __init setup_command_line(char *command_line)
 		 * to init.
 		 */
 		len = strlen(saved_command_line);
-		if (!strstr(boot_command_line, " -- ")) {
-			strcpy(saved_command_line + len, " -- ");
-			len += 4;
+		if (!strstr(boot_command_line, argsep_str)) {
+			strcpy(saved_command_line + len, argsep_str);
+			len += strlen(argsep_str);
 		} else
 			saved_command_line[len++] = ' ';
 
@@ -1001,12 +1004,11 @@ static int __init initcall_blacklist(char *str)
 			entry = memblock_alloc(sizeof(*entry),
 					       SMP_CACHE_BYTES);
 			if (!entry)
-				panic("%s: Failed to allocate %zu bytes\n",
-				      __func__, sizeof(*entry));
+				panic(alloc_fail_msg, __func__, sizeof(*entry));
 			entry->buf = memblock_alloc(strlen(str_entry) + 1,
 						    SMP_CACHE_BYTES);
 			if (!entry->buf)
-				panic("%s: Failed to allocate %zu bytes\n",
+				panic(alloc_fail_msg,
 				      __func__, strlen(str_entry) + 1);
 			strcpy(entry->buf, str_entry);
 			list_add(&entry->next, &blacklisted_initcalls);
@@ -1204,7 +1206,7 @@ static void __init do_initcalls(void)
 
 	command_line = kzalloc(len, GFP_KERNEL);
 	if (!command_line)
-		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+		panic(alloc_fail_msg, __func__, len);
 
 	for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
 		/* Parser modifies command_line, restore it each time */
-- 
2.25.0.341.g760bfbb309-goog