diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2020-12-02 13:15:58 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-12-02 19:49:11 +0000 |
| commit | 1517c4facf2e66401394998dba1ee236fd261310 (patch) | |
| tree | bb0d14d121fc351344d4143ff53f4099ee943978 /arch/arm64/Kconfig | |
| parent | 7cf283c7bd6260ae43a74cd213f5ec9d665a19b5 (diff) | |
arm64: uaccess: remove vestigal UAO support
Now that arm64 no longer uses UAO, remove the vestigal feature detection
code and Kconfig text.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201202131558.39270-13-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6fae3ec1f2b6..8d13b9135634 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1427,27 +1427,6 @@ endmenu menu "ARMv8.2 architectural features" -config ARM64_UAO - bool "Enable support for User Access Override (UAO)" - default y - help - User Access Override (UAO; part of the ARMv8.2 Extensions) - causes the 'unprivileged' variant of the load/store instructions to - be overridden to be privileged. - - This option changes get_user() and friends to use the 'unprivileged' - variant of the load/store instructions. This ensures that user-space - really did have access to the supplied memory. When addr_limit is - set to kernel memory the UAO bit will be set, allowing privileged - access to kernel memory. - - Choosing this option will cause copy_to_user() et al to use user-space - memory permissions. - - The feature is detected at runtime, the kernel will use the - regular load/store instructions if the cpu does not implement the - feature. - config ARM64_PMEM bool "Enable support for persistent memory" select ARCH_HAS_PMEM_API |