arm64: Document sysctls for emulated deprecated instructions
We have support for emulating a number of deprecated instructions in the kernel with individual Kconfig options enabling this support per instruction. In addition to the Kconfig options we also provide runtime control via sysctls but this is not currently mentioned in the Kconfig so not very discoverable for users. This is particularly important for SWP/SWPB since this is disabled by default at runtime and must be enabled via the sysctl, causing considerable frustration for users who have enabled the config option and are then confused to find that the instruction is still faulting. Add a reference to the sysctls in the help text for each of the config options, noting that SWP/SWPB is disabled by default, to improve the user experience. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20200625131507.32334-1-broonie@kernel.orgSigned-off-by: Catalin Marinas <catalin.marinas@arm.com>
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