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MIPS: Add support for extending builtin cmdline 

Allow the builtin command line to be extended by what the bootloader
passes in.  For example, the bootloader can pass specific arguments
depending on the boot mode, and these should override the defaults in
the builtin cmdline.

The default MIPS_CMDLINE_FROM_BOOTLOADER option prepends the
bootloader's cmdline to the builtin cmdline so is not suitable for this
purpose.

Signed-off-by: Rabin Vincent <rabinv@axis.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13181/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Rabin Vincent 2016-04-28 11:03:09 +02:00 committed by Ralf Baechle
parent e54ad8c562
commit ed47e15332
2 changed files with 12 additions and 0 deletions
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4
arch/mips/Kconfig
View File

@ -2930,6 +2930,10 @@ choice
config MIPS_CMDLINE_FROM_BOOTLOADER
bool "Bootloader kernel arguments if available"
config MIPS_CMDLINE_BUILTIN_EXTEND
depends on CMDLINE_BOOL
bool "Extend builtin kernel arguments with bootloader arguments"
endchoice
endmenu

8
arch/mips/kernel/setup.c
View File

@ -640,6 +640,8 @@ static void __init request_crashkernel(struct resource *res)
#define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
#define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
#define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
#define BUILTIN_EXTEND_WITH_PROM \
IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
static void __init arch_mem_init(char **cmdline_p)
{
@ -684,6 +686,12 @@ static void __init arch_mem_init(char **cmdline_p)
strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
}
if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
if (boot_command_line[0])
strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
}
#endif
#endif
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);