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Now that all the code is in place provide a Kconfig option allowing users
to enable BTI for the kernel if their toolchain supports it, defaulting it
on since this has security benefits. This is a separate configuration
option since we currently don't support secondary CPUs that lack BTI if
the boot CPU supports it.
Code generation issues mean that current GCC 9 versions are not able to
produce usable BTI binaries so we disable support for building with GCC
versions prior to 10, once a fix is backported to GCC 9 the dependencies
will be updated.
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200506195138.22086-8-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
97fed779f2