linux-kernel - [PATCH v6 2/5] x86: Add cmdline

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Message-Id: <fc6713d1cb670313cdb61cc6f929dddc110f25d9.1661565218.git.baskov@ispras.ru>
Date:   Sat, 27 Aug 2022 05:08:07 +0300
From:   Evgeniy Baskov <baskov@...ras.ru>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Evgeniy Baskov <baskov@...ras.ru>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>
Subject: [PATCH v6 2/5] x86: Add cmdline_prepare() helper

Command line needs to be combined in both compressed and uncompressed
kernel from built-in and boot command line strings, which requires
non-trivial logic depending on CONFIG_CMDLINE_BOOL and
CONFIG_CMDLINE_OVERRIDE.

Add a helper function to avoid code duplication.

Signed-off-by: Evgeniy Baskov <baskov@...ras.ru>
---
 arch/x86/include/asm/shared/cmdline.h | 37 +++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 arch/x86/include/asm/shared/cmdline.h

diff --git a/arch/x86/include/asm/shared/cmdline.h b/arch/x86/include/asm/shared/cmdline.h
new file mode 100644
index 000000000000..a440d0bd6840
--- /dev/null
+++ b/arch/x86/include/asm/shared/cmdline.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_X86_SETUP_CMDLINE_H
+#define _ASM_X86_SETUP_CMDLINE_H
+
+#define _SETUP
+#include <asm/setup.h> /* For COMMAND_LINE_SIZE */
+#undef _SETUP
+
+#include <linux/string.h>
+
+#ifdef CONFIG_CMDLINE_BOOL
+#define COMMAND_LINE_INIT CONFIG_CMDLINE
+#else
+#define COMMAND_LINE_INIT ""
+#endif
+
+/*
+ * command_line and boot_command_line are expected to be at most
+ * COMMAND_LINE_SIZE length. command_line needs to be initialized
+ * with COMMAND_LINE_INIT.
+ */
+static inline void cmdline_prepare(char *command_line,
+				   const char *boot_command_line)
+{
+#ifdef CONFIG_CMDLINE_BOOL
+	if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
+		/* Append boot loader cmdline to builtin */
+		strlcat(command_line, " ", COMMAND_LINE_SIZE);
+		strlcat(command_line, boot_command_line, COMMAND_LINE_SIZE);
+	}
+#else
+	strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
+#endif
+}
+
+#endif /* _ASM_X86_SETUP_CMDLINE_H */
-- 
2.37.2