linux-kernel - [RFC 8/8] params: don't use alloc_bootmem for saved_command

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Message-Id: <200812012327.00134.rusty@rustcorp.com.au>
Date:	Mon, 1 Dec 2008 23:26:59 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	linux-kernel@...r.kernel.org
Subject: [RFC 8/8] params: don't use alloc_bootmem for saved_command_line


We only need it for /proc, so just use kstrdup().

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 init/main.c |   24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/init/main.c b/init/main.c
--- a/init/main.c
+++ b/init/main.c
@@ -123,8 +123,6 @@ char __initdata boot_command_line[COMMAN
 char __initdata boot_command_line[COMMAND_LINE_SIZE];
 /* Untouched saved command line (eg. for /proc) */
 char *saved_command_line;
-/* Command line for parameter parsing */
-static char *static_command_line;
 
 static char *execute_command;
 static char *ramdisk_execute_command;
@@ -453,20 +451,6 @@ static void __init smp_init(void)
 #endif
 
 /*
- * We need to store the untouched command line for future reference.
- * We also need to store the touched command line since the parameter
- * parsing is performed in place, and we should allow a component to
- * store reference of name/value for future reference.
- */
-static void __init setup_command_line(void)
-{
-	saved_command_line = alloc_bootmem(strlen (boot_command_line)+1);
-	static_command_line = alloc_bootmem(strlen (boot_command_line)+1);
-	strcpy (saved_command_line, boot_command_line);
-	strcpy (static_command_line, boot_command_line);
-}
-
-/*
  * We need to finalize in a non-__init function or else race conditions
  * between the root thread and the init thread may cause start_kernel to
  * be reaped by free_initmem before the root thread has proceeded to
@@ -547,6 +531,8 @@ void __init __weak arch_get_boot_command
 /* Ideally, this would take a 'const char *cmdline' param. */
 asmlinkage void __init start_kernel(void)
 {
+	char *static_command_line;
+
 	arch_get_boot_command_line();
 	parse_args("Core params", boot_command_line, __start___core_param,
 		   __stop___core_param - __start___core_param,
@@ -582,7 +568,6 @@ asmlinkage void __init start_kernel(void
 	printk(linux_banner);
 	setup_arch();
 	mm_init_owner(&init_mm, &init_task);
-	setup_command_line();
 
 	unwind_setup();
 	setup_per_cpu_areas();
@@ -603,6 +588,9 @@ asmlinkage void __init start_kernel(void
 	build_all_zonelists();
 	page_alloc_init();
 	printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
+	/* param parsing can keep pointers to the commandline. */
+	static_command_line = alloc_bootmem(strlen(boot_command_line)+1);
+	strcpy(static_command_line, boot_command_line);
 	parse_args("Booting kernel", static_command_line, __start___param,
 		   __stop___param - __start___param,
 		   &unknown_bootoption, false);
@@ -704,6 +692,8 @@ asmlinkage void __init start_kernel(void
 
 	ftrace_init();
 
+	saved_command_line = kstrdup(boot_command_line, GFP_KERNEL);
+
 	/* Do the rest non-__init'ed, we're now alive */
 	rest_init();
 }


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