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authorTyler Hicks <tyhicks@linux.microsoft.com>2020-09-21 14:15:57 -0500
committerCatalin Marinas <catalin.marinas@arm.com>2020-11-27 18:38:55 +0000
commit1e40d105dae5b7aca8ca7bfd7a0c348c0c509dba (patch)
treeea4bee0174e0c99de7e45792bde958e414ec3008 /Documentation/timers
parent52ec03f75d599d5bc240422bac8574724a319bec (diff)
arm64: Extend the kernel command line from the bootloader
Provide support for additional kernel command line parameters to be concatenated onto the end of the command line provided by the bootloader. Additional parameters are specified in the CONFIG_CMDLINE option when CONFIG_CMDLINE_EXTEND is selected, matching other architectures and leveraging existing support in the FDT and EFI stub code. Special care must be taken for the arch-specific nokaslr parsing. Search the bootargs FDT property and the CONFIG_CMDLINE when CONFIG_CMDLINE_EXTEND is in use. There are a couple of known use cases for this feature: 1) Switching between stable and development kernel versions, where one of the versions benefits from additional command line parameters, such as debugging options. 2) Specifying additional command line parameters, for additional tuning or debugging, when the bootloader does not offer an interactive mode. Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com> Link: https://lore.kernel.org/r/20200921191557.350256-3-tyhicks@linux.microsoft.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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