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Message-ID: <CAMj1kXF9k2J5eZdn6R6bn4ChRVyuGYHM7bOtycf1QKrakrua_g@mail.gmail.com>
Date: Tue, 9 Mar 2021 07:43:01 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Daniel Walker <danielwa@...co.com>
Cc: 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 ML <x86@...nel.org>,
"open list:MIPS" <linux-mips@...r.kernel.org>,
"open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)"
<linuxppc-dev@...ts.ozlabs.org>, xe-linux-external@...co.com,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H. Peter Anvin" <hpa@...or.com>,
Ruslan Ruslichenko <rruslich@...co.com>,
Ruslan Bilovol <ruslan.bilovol@...il.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v2 7/7] CMDLINE: x86: convert to generic builtin command line
On Tue, 9 Mar 2021 at 01:03, Daniel Walker <danielwa@...co.com> wrote:
>
> This updates the x86 code to use the CONFIG_GENERIC_CMDLINE
> option.
>
> Cc: xe-linux-external@...co.com
> Signed-off-by: Ruslan Ruslichenko <rruslich@...co.com>
> Signed-off-by: Ruslan Bilovol <ruslan.bilovol@...il.com>
> Signed-off-by: Daniel Walker <danielwa@...co.com>
> ---
> arch/x86/Kconfig | 44 +------------------------
> arch/x86/kernel/setup.c | 18 ++--------
> drivers/firmware/efi/libstub/x86-stub.c | 2 +-
> 3 files changed, 4 insertions(+), 60 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 21f851179ff0..3950f9bf9855 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -115,6 +115,7 @@ config X86
> select EDAC_SUPPORT
> select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
> select GENERIC_CLOCKEVENTS_MIN_ADJUST
> + select GENERIC_CMDLINE
> select GENERIC_CMOS_UPDATE
> select GENERIC_CPU_AUTOPROBE
> select GENERIC_CPU_VULNERABILITIES
> @@ -2368,49 +2369,6 @@ choice
>
> endchoice
>
> -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 && CMDLINE != ""
> - 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 740f3bdb3f61..e748c3e5c1ae 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -48,6 +48,7 @@
> #include <asm/unwind.h>
> #include <asm/vsyscall.h>
> #include <linux/vmalloc.h>
> +#include <linux/cmdline.h>
>
> /*
> * max_low_pfn_mapped: highest directly mapped pfn < 4 GB
> @@ -162,9 +163,6 @@ 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;
> @@ -884,19 +882,7 @@ 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;
>
> diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
> index f14c4ff5839f..9538c9d4a0bc 100644
> --- a/drivers/firmware/efi/libstub/x86-stub.c
> +++ b/drivers/firmware/efi/libstub/x86-stub.c
> @@ -736,7 +736,7 @@ unsigned long efi_main(efi_handle_t handle,
> }
>
> #ifdef CONFIG_CMDLINE_BOOL
Does this CMDLINE_BOOL check need to be dropped as well?
> - status = efi_parse_options(CONFIG_CMDLINE);
> + status = efi_parse_options(CONFIG_CMDLINE_PREPEND " " CONFIG_CMDLINE_APPEND);
> if (status != EFI_SUCCESS) {
> efi_err("Failed to parse options\n");
> goto fail;
> --
> 2.25.1
>
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