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arm64: Make ARMV8_DEPRECATED depend on SYSCTL

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If CONFIG_SYSCTL=n and CONFIG_ARMV8_DEPRECATED=y, the deprecated
instruction emulation code currently leaks some memory at boot
time, and won't have any runtime control interface.  This does
not feel like useful or intended behaviour...

This patch adds a dependency on CONFIG_SYSCTL, so that such a
kernel can't be built in the first place.

It's probably not worth adding the error-handling / cleanup code
that would be needed to deal with this otherwise: people who
desperately need the emulation can still enable SYSCTL.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Dave Martin 2017-11-06 18:07:11 +00:00 committed by Will Deacon
parent 9bfe7553fa
commit 6cfa7cc46b
1 changed files with 1 additions and 0 deletions
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arch/arm64/Kconfig
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@ -807,6 +807,7 @@ config FORCE_MAX_ZONEORDER
menuconfig ARMV8_DEPRECATED
bool "Emulate deprecated/obsolete ARMv8 instructions"
depends on COMPAT
depends on SYSCTL
help
Legacy software support may require certain instructions
that have been deprecated or obsoleted in the architecture.