linux-kernel - [PATCH 2/2] init/main.c: sink the kernel

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Message-Id: <20201230060424.29097-3-liupeibao@163.com>
Date:   Wed, 30 Dec 2020 14:04:24 +0800
From:   Liu Peibao <liupeibao@....com>
To:     mhiramat@...nel.org, rostedt@...dmis.org, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] init/main.c: sink the kernel_init to the bottom

Remove the redundant kernel_init_freeable statement.

Signed-off-by: Liu Peibao <liupeibao@....com>
---
 init/main.c | 132 ++++++++++++++++++++++++++--------------------------
 1 file changed, 65 insertions(+), 67 deletions(-)

diff --git a/init/main.c b/init/main.c
index 1e492de770c8..d5c2fa85ee54 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1364,8 +1364,6 @@ static int try_to_run_init_process(const char *init_filename)
 	return ret;
 }
 
-static noinline void __init kernel_init_freeable(void);
-
 #if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
 bool rodata_enabled __ro_after_init = true;
 static int __init set_debug_rodata(char *str)
@@ -1408,71 +1406,6 @@ void __weak free_initmem(void)
 	free_initmem_default(POISON_FREE_INITMEM);
 }
 
-static int __ref kernel_init(void *unused)
-{
-	int ret;
-
-	kernel_init_freeable();
-	/* need to finish all async __init code before freeing the memory */
-	async_synchronize_full();
-	kprobe_free_init_mem();
-	ftrace_free_init_mem();
-	free_initmem();
-	mark_readonly();
-
-	/*
-	 * Kernel mappings are now finalized - update the userspace page-table
-	 * to finalize PTI.
-	 */
-	pti_finalize();
-
-	system_state = SYSTEM_RUNNING;
-	numa_default_policy();
-
-	rcu_end_inkernel_boot();
-
-	do_sysctl_args();
-
-	if (ramdisk_execute_command) {
-		ret = run_init_process(ramdisk_execute_command);
-		if (!ret)
-			return 0;
-		pr_err("Failed to execute %s (error %d)\n",
-		       ramdisk_execute_command, ret);
-	}
-
-	/*
-	 * We try each of these until one succeeds.
-	 *
-	 * The Bourne shell can be used instead of init if we are
-	 * trying to recover a really broken machine.
-	 */
-	if (execute_command) {
-		ret = run_init_process(execute_command);
-		if (!ret)
-			return 0;
-		panic("Requested init %s failed (error %d).",
-		      execute_command, ret);
-	}
-
-	if (CONFIG_DEFAULT_INIT[0] != '\0') {
-		ret = run_init_process(CONFIG_DEFAULT_INIT);
-		if (ret)
-			pr_err("Default init %s failed (error %d)\n",
-			       CONFIG_DEFAULT_INIT, ret);
-		else
-			return 0;
-	}
-
-	if (!try_to_run_init_process("/sbin/init") ||
-	    !try_to_run_init_process("/etc/init") ||
-	    !try_to_run_init_process("/bin/init") ||
-	    !try_to_run_init_process("/bin/sh"))
-		return 0;
-
-	panic("No working init found. Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.");
-}
-
 /* Open /dev/console, for stdin/stdout/stderr, this should never fail */
 void __init console_on_rootfs(void)
 {
@@ -1554,3 +1487,68 @@ static noinline void __init kernel_init_freeable(void)
 
 	integrity_load_keys();
 }
+
+static int __ref kernel_init(void *unused)
+{
+	int ret;
+
+	kernel_init_freeable();
+	/* need to finish all async __init code before freeing the memory */
+	async_synchronize_full();
+	kprobe_free_init_mem();
+	ftrace_free_init_mem();
+	free_initmem();
+	mark_readonly();
+
+	/*
+	 * Kernel mappings are now finalized - update the userspace page-table
+	 * to finalize PTI.
+	 */
+	pti_finalize();
+
+	system_state = SYSTEM_RUNNING;
+	numa_default_policy();
+
+	rcu_end_inkernel_boot();
+
+	do_sysctl_args();
+
+	if (ramdisk_execute_command) {
+		ret = run_init_process(ramdisk_execute_command);
+		if (!ret)
+			return 0;
+		pr_err("Failed to execute %s (error %d)\n",
+		       ramdisk_execute_command, ret);
+	}
+
+	/*
+	 * We try each of these until one succeeds.
+	 *
+	 * The Bourne shell can be used instead of init if we are
+	 * trying to recover a really broken machine.
+	 */
+	if (execute_command) {
+		ret = run_init_process(execute_command);
+		if (!ret)
+			return 0;
+		panic("Requested init %s failed (error %d).",
+		      execute_command, ret);
+	}
+
+	if (CONFIG_DEFAULT_INIT[0] != '\0') {
+		ret = run_init_process(CONFIG_DEFAULT_INIT);
+		if (ret)
+			pr_err("Default init %s failed (error %d)\n",
+			       CONFIG_DEFAULT_INIT, ret);
+		else
+			return 0;
+	}
+
+	if (!try_to_run_init_process("/sbin/init") ||
+	    !try_to_run_init_process("/etc/init") ||
+	    !try_to_run_init_process("/bin/init") ||
+	    !try_to_run_init_process("/bin/sh"))
+		return 0;
+
+	panic("No working init found. Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.");
+}
-- 
2.17.1