linux-kernel - [PATCH v2 fs/proc/bootconfig 2/2] fs/proc: Skip bootloader comment if no embedded kernel parameters

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Date: Mon,  8 Apr 2024 21:43:58 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Cc: Zhenhua Huang <quic_zhenhuah@...cinc.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	"Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH v2 fs/proc/bootconfig 2/2] fs/proc: Skip bootloader comment if no embedded kernel parameters

From: Masami Hiramatsu <mhiramat@...nel.org>

If the "bootconfig" kernel command-line argument was specified or if
the kernel was built with CONFIG_BOOT_CONFIG_FORCE, but if there are
no embedded kernel parameter, omit the "# Parameters from bootloader:"
comment from the /proc/bootconfig file.  This will cause automation
to fall back to the /proc/cmdline file, which will be identical to the
comment in this no-embedded-kernel-parameters case.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 fs/proc/bootconfig.c       | 2 +-
 include/linux/bootconfig.h | 1 +
 init/main.c                | 5 +++++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/proc/bootconfig.c b/fs/proc/bootconfig.c
index e5635a6b127b0..87dcaae32ff87 100644
--- a/fs/proc/bootconfig.c
+++ b/fs/proc/bootconfig.c
@@ -63,7 +63,7 @@ static int __init copy_xbc_key_value_list(char *dst, size_t size)
 			dst += ret;
 		}
 	}
-	if (ret >= 0 && boot_command_line[0]) {
+	if (cmdline_has_extra_options() && ret >= 0 && boot_command_line[0]) {
 		ret = snprintf(dst, rest(dst, end), "# Parameters from bootloader:\n# %s\n",
 			       boot_command_line);
 		if (ret > 0)
diff --git a/include/linux/bootconfig.h b/include/linux/bootconfig.h
index ca73940e26df8..e5ee2c694401e 100644
--- a/include/linux/bootconfig.h
+++ b/include/linux/bootconfig.h
@@ -10,6 +10,7 @@
 #ifdef __KERNEL__
 #include <linux/kernel.h>
 #include <linux/types.h>
+bool __init cmdline_has_extra_options(void);
 #else /* !__KERNEL__ */
 /*
  * NOTE: This is only for tools/bootconfig, because tools/bootconfig will
diff --git a/init/main.c b/init/main.c
index 2ca52474d0c30..881f6230ee59e 100644
--- a/init/main.c
+++ b/init/main.c
@@ -487,6 +487,11 @@ static int __init warn_bootconfig(char *str)
 
 early_param("bootconfig", warn_bootconfig);
 
+bool __init cmdline_has_extra_options(void)
+{
+	return extra_command_line || extra_init_args;
+}
+
 /* Change NUL term back to "=", to make "param" the whole string. */
 static void __init repair_env_string(char *param, char *val)
 {
-- 
2.40.1