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authorWill Deacon <will@kernel.org>2019-10-07 13:03:12 +0100
committerWill Deacon <will@kernel.org>2019-10-07 13:32:15 +0100
commit7c4791c9efca8c105a86022f7d5532aeaa819125 (patch)
treea78b0ef907204b58eb7843ea1538e79b25929d57 /arch/arm64/Kconfig
parentarm64: vdso32: Rename COMPATCC to CC_COMPAT (diff)
downloadlinux-dev-7c4791c9efca8c105a86022f7d5532aeaa819125.tar.xz
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arm64: Kconfig: Make CONFIG_COMPAT_VDSO a proper Kconfig option
CONFIG_COMPAT_VDSO is defined by passing '-DCONFIG_COMPAT_VDSO' to the compiler when the generic compat vDSO code is in use. It's much cleaner and simpler to expose this as a proper Kconfig option (like x86 does), so do that and remove the bodge. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/Kconfig')
-rw-r--r--arch/arm64/Kconfig15
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index ba12b3a11e55..950a56b71ff0 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -110,7 +110,6 @@ config ARM64
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select GENERIC_GETTIMEOFDAY
- select GENERIC_COMPAT_VDSO if (!CPU_BIG_ENDIAN && COMPAT && "$(CROSS_COMPILE_COMPAT)" != "")
select HANDLE_DOMAIN_IRQ
select HARDIRQS_SW_RESEND
select HAVE_PCI
@@ -1159,7 +1158,7 @@ menuconfig COMPAT
if COMPAT
config KUSER_HELPERS
- bool "Enable kuser helpers page for 32 bit applications"
+ bool "Enable kuser helpers page for 32-bit applications"
default y
help
Warning: disabling this option may break 32-bit user programs.
@@ -1185,6 +1184,18 @@ config KUSER_HELPERS
Say N here only if you are absolutely certain that you do not
need these helpers; otherwise, the safe option is to say Y.
+config COMPAT_VDSO
+ bool "Enable vDSO for 32-bit applications"
+ depends on !CPU_BIG_ENDIAN && "$(CROSS_COMPILE_COMPAT)" != ""
+ select GENERIC_COMPAT_VDSO
+ default y
+ help
+ Place in the process address space of 32-bit applications an
+ ELF shared object providing fast implementations of gettimeofday
+ and clock_gettime.
+
+ You must have a 32-bit build of glibc 2.22 or later for programs
+ to seamlessly take advantage of this.
menuconfig ARMV8_DEPRECATED
bool "Emulate deprecated/obsolete ARMv8 instructions"