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Date: Tue, 6 Oct 2015 08:47:09 -0700
From: Daniel Walker <danielwa@...co.com>
To: xe-kernel@...ernal.cisco.com, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc: Daniel Walker <dwalker@...o99.com>, linux-kernel@...r.kernel.org
Subject: [PATCH-RFC 2/7] x86: convert to generic builtin command line
This updates the x86 code to use the CONFIG_GENERIC_CMDLINE
option.
Cc: xe-kernel@...ernal.cisco.com
Cc: Daniel Walker <dwalker@...o99.com>
Signed-off-by: Daniel Walker <danielwa@...co.com>
---
arch/x86/Kconfig | 44 +-------------------------------------------
arch/x86/kernel/setup.c | 19 +++----------------
2 files changed, 4 insertions(+), 59 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 328c835..f3734cf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -152,6 +152,7 @@ config X86
select VIRT_TO_BUS
select X86_DEV_DMA_OPS if X86_64
select X86_FEATURE_NAMES if PROC_FS
+ select GENERIC_CMDLINE
config INSTRUCTION_DECODER
def_bool y
@@ -2042,49 +2043,6 @@ config COMPAT_VDSO
If unsure, say N: if you are compiling your own kernel, you
are unlikely to be using a buggy version of glibc.
-config CMDLINE_BOOL
- bool "Built-in kernel command line"
- ---help---
- Allow for specifying boot arguments to the kernel at
- build time. On some systems (e.g. embedded ones), it is
- necessary or convenient to provide some or all of the
- kernel boot arguments with the kernel itself (that is,
- to not rely on the boot loader to provide them.)
-
- To compile command line arguments into the kernel,
- set this option to 'Y', then fill in the
- boot arguments in CONFIG_CMDLINE.
-
- Systems with fully functional boot loaders (i.e. non-embedded)
- should leave this option set to 'N'.
-
-config CMDLINE
- string "Built-in kernel command string"
- depends on CMDLINE_BOOL
- default ""
- ---help---
- Enter arguments here that should be compiled into the kernel
- image and used at boot time. If the boot loader provides a
- command line at boot time, it is appended to this string to
- form the full kernel command line, when the system boots.
-
- However, you can use the CONFIG_CMDLINE_OVERRIDE option to
- change this behavior.
-
- In most cases, the command line (whether built-in or provided
- by the boot loader) should specify the device for the root
- file system.
-
-config CMDLINE_OVERRIDE
- bool "Built-in command line overrides boot loader arguments"
- depends on CMDLINE_BOOL
- ---help---
- Set this option to 'Y' to have the kernel ignore the boot loader
- command line, and use ONLY the built-in command line.
-
- This is used to work around broken boot loaders. This should
- be set to 'N' under normal conditions.
-
config MODIFY_LDT_SYSCALL
bool "Enable the LDT (local descriptor table)" if EXPERT
default y
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index fdb7f2a..de9e9ce 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -50,6 +50,7 @@
#include <linux/init_ohci1394_dma.h>
#include <linux/kvm_para.h>
#include <linux/dma-contiguous.h>
+#include <linux/cmdline.h>
#include <linux/errno.h>
#include <linux/kernel.h>
@@ -232,9 +233,6 @@ unsigned long saved_video_mode;
#define RAMDISK_LOAD_FLAG 0x4000
static char __initdata command_line[COMMAND_LINE_SIZE];
-#ifdef CONFIG_CMDLINE_BOOL
-static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
-#endif
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
struct edd edd;
@@ -949,20 +947,9 @@ void __init setup_arch(char **cmdline_p)
bss_resource.start = __pa_symbol(__bss_start);
bss_resource.end = __pa_symbol(__bss_stop)-1;
-#ifdef CONFIG_CMDLINE_BOOL
-#ifdef CONFIG_CMDLINE_OVERRIDE
- strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
-#else
- if (builtin_cmdline[0]) {
- /* append boot loader cmdline to builtin */
- strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
- strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
- strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
- }
-#endif
-#endif
-
+ cmdline_add_builtin(boot_command_line, NULL, COMMAND_LINE_SIZE);
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
+
*cmdline_p = command_line;
/*
--
2.1.4
--
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