[PATCH 8/8] CMDLINE: arm64: convert to generic builtin command line

[Daniel Walker]

This removes arm64 from the device tree handling of the
command line arguments.

The boot_command_line variable is populated inside the earliest
user of the command line, which is in idreg-override.c.

The device tree should not be needed to do any further handling
of the boot command line options.

Cc: xe-linux-external@xxxxxxxxx
Signed-off-by: Daniel Walker <danielwa@xxxxxxxxx>
---
 arch/arm64/Kconfig                  | 33 +----------------------------
 arch/arm64/include/asm/setup.h      |  4 ++++
 arch/arm64/include/uapi/asm/setup.h |  2 ++
 arch/arm64/kernel/idreg-override.c  |  9 ++++----
 arch/arm64/kernel/pi/kaslr_early.c  | 14 ++++++------
 5 files changed, 19 insertions(+), 43 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 78f20e632712..d3b7fd1080d0 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -131,6 +131,7 @@ config ARM64
 	select GENERIC_ALLOCATOR
 	select GENERIC_ARCH_TOPOLOGY
 	select GENERIC_CLOCKEVENTS_BROADCAST
+	select GENERIC_CMDLINE
 	select GENERIC_CPU_AUTOPROBE
 	select GENERIC_CPU_VULNERABILITIES
 	select GENERIC_EARLY_IOREMAP
@@ -2217,38 +2218,6 @@ config ARM64_ACPI_PARKING_PROTOCOL
 	  protocol even if the corresponding data is present in the ACPI
 	  MADT table.
 
-config CMDLINE
-	string "Default kernel command string"
-	default ""
-	help
-	  Provide a set of default command-line options at build time by
-	  entering them here. As a minimum, you should specify the the
-	  root device (e.g. root=/dev/nfs).
-
-choice
-	prompt "Kernel command line type" if CMDLINE != ""
-	default CMDLINE_FROM_BOOTLOADER
-	help
-	  Choose how the kernel will handle the provided default kernel
-	  command line string.
-
-config CMDLINE_FROM_BOOTLOADER
-	bool "Use bootloader kernel arguments if available"
-	help
-	  Uses the command-line options passed by the boot loader. If
-	  the boot loader doesn't provide any, the default kernel command
-	  string provided in CMDLINE will be used.
-
-config CMDLINE_FORCE
-	bool "Always use the default kernel command string"
-	help
-	  Always use the default kernel command string, even if the boot
-	  loader passes other arguments to the kernel.
-	  This is useful if you cannot or don't want to change the
-	  command-line options your boot loader passes to the kernel.
-
-endchoice
-
 config EFI_STUB
 	bool
 
diff --git a/arch/arm64/include/asm/setup.h b/arch/arm64/include/asm/setup.h
index f4af547ef54c..5a8037262cbb 100644
--- a/arch/arm64/include/asm/setup.h
+++ b/arch/arm64/include/asm/setup.h
@@ -3,10 +3,13 @@
 #ifndef __ARM64_ASM_SETUP_H
 #define __ARM64_ASM_SETUP_H
 
+#ifndef __ASSEMBLY__
 #include <linux/string.h>
+#endif
 
 #include <uapi/asm/setup.h>
 
+#ifndef __ASSEMBLY__
 void *get_early_fdt_ptr(void);
 void early_fdt_map(u64 dt_phys);
 
@@ -30,5 +33,6 @@ static inline bool arch_parse_debug_rodata(char *arg)
 	return false;
 }
 #define arch_parse_debug_rodata arch_parse_debug_rodata
+#endif /* __ASSEMBLY__ */
 
 #endif
diff --git a/arch/arm64/include/uapi/asm/setup.h b/arch/arm64/include/uapi/asm/setup.h
index 5d703888f351..f5fc5b806369 100644
--- a/arch/arm64/include/uapi/asm/setup.h
+++ b/arch/arm64/include/uapi/asm/setup.h
@@ -20,7 +20,9 @@
 #ifndef __ASM_SETUP_H
 #define __ASM_SETUP_H
 
+#ifndef __ASSEMBLY__
 #include <linux/types.h>
+#endif
 
 #define COMMAND_LINE_SIZE	2048
 
diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c
index 3addc09f8746..6334a9228909 100644
--- a/arch/arm64/kernel/idreg-override.c
+++ b/arch/arm64/kernel/idreg-override.c
@@ -9,6 +9,7 @@
 #include <linux/ctype.h>
 #include <linux/kernel.h>
 #include <linux/libfdt.h>
+#include <linux/cmdline.h>
 
 #include <asm/cacheflush.h>
 #include <asm/cpufeature.h>
@@ -304,11 +305,11 @@ static __init void parse_cmdline(void)
 {
 	const u8 *prop = get_bootargs_cmdline();
 
-	if (IS_ENABLED(CONFIG_CMDLINE_FORCE) || !prop)
-		__parse_cmdline(CONFIG_CMDLINE, true);
+	strscpy(boot_command_line, prop, COMMAND_LINE_SIZE);
+	cmdline_add_builtin(boot_command_line);
+
+	__parse_cmdline(boot_command_line, true);
 
-	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && prop)
-		__parse_cmdline(prop, true);
 }
 
 /* Keep checkers quiet */
diff --git a/arch/arm64/kernel/pi/kaslr_early.c b/arch/arm64/kernel/pi/kaslr_early.c
index 17bff6e399e4..1e00bc01fa7a 100644
--- a/arch/arm64/kernel/pi/kaslr_early.c
+++ b/arch/arm64/kernel/pi/kaslr_early.c
@@ -11,6 +11,7 @@
 #include <linux/types.h>
 #include <linux/sizes.h>
 #include <linux/string.h>
+#include <linux/cmdline.h>
 
 #include <asm/archrandom.h>
 #include <asm/memory.h>
@@ -42,7 +43,7 @@ static bool cmdline_contains_nokaslr(const u8 *cmdline)
 
 static bool is_kaslr_disabled_cmdline(void *fdt)
 {
-	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE)) {
+	if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
 		int node;
 		const u8 *prop;
 
@@ -54,16 +55,15 @@ static bool is_kaslr_disabled_cmdline(void *fdt)
 		if (!prop)
 			goto out;
 
+		if (cmdline_contains_nokaslr(CMDLINE_STATIC_APPEND))
+			return true;
 		if (cmdline_contains_nokaslr(prop))
 			return true;
-
-		if (IS_ENABLED(CONFIG_CMDLINE_EXTEND))
-			goto out;
-
-		return false;
+		if (cmdline_contains_nokaslr(CMDLINE_STATIC_PREPEND))
+			return true;
 	}
 out:
-	return cmdline_contains_nokaslr(CONFIG_CMDLINE);
+	return cmdline_contains_nokaslr(cmdline_get_static_builtin());
 }
 
 static u64 get_kaslr_seed(void *fdt)
-- 
2.39.2