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

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Message-Id: <20210416040924.2882771-9-danielwa@cisco.com>
Date:   Thu, 15 Apr 2021 21:09:19 -0700
From:   Daniel Walker <danielwa@...co.com>
To:     Will Deacon <will@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Rob Herring <robh@...nel.org>,
        Daniel Gimpelevich <daniel@...pelevich.san-francisco.ca.us>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Catalin Marinas <catalin.marinas@....com>
Cc:     xe-linux-external@...co.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 8/8] CMDLINE: arm64: convert to generic builtin command line

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@...co.com
Signed-off-by: Daniel Walker <danielwa@...co.com>
---
 arch/arm64/Kconfig                 | 33 +-----------------------------
 arch/arm64/include/asm/setup.h     |  2 ++
 arch/arm64/kernel/idreg-override.c |  9 ++++----
 3 files changed, 8 insertions(+), 36 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e4e1b6550115..9781ba3758b1 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -105,6 +105,7 @@ 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
@@ -1841,38 +1842,6 @@ 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 d3320618ed14..1f5b6d8f2433 100644
--- a/arch/arm64/include/asm/setup.h
+++ b/arch/arm64/include/asm/setup.h
@@ -5,7 +5,9 @@
 
 #include <uapi/asm/setup.h>
 
+#ifndef __ASSEMBLY__
 void *get_early_fdt_ptr(void);
 void early_fdt_map(u64 dt_phys);
+#endif /* __ASSEMBLY__ */
 
 #endif
diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c
index 83f1c4b92095..0a3fcae13043 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>
@@ -188,11 +189,11 @@ 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 */
-- 
2.25.1