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| author | Nathan Lynch <nathan_lynch@mentor.com> | 2015-03-25 19:16:05 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-03-27 23:20:45 +0100 |
| commit | e5b61deb3af465f11db7e5e11944ba00a33ece1f (patch) | |
| tree | 9a33472595fbd61a56618226340db1d9b53476f8 /arch | |
| parent | ARM: 8331/1: VDSO initialization, mapping, and synchronization (diff) | |
| download | linux-e5b61deb3af465f11db7e5e11944ba00a33ece1f.tar.xz linux-e5b61deb3af465f11db7e5e11944ba00a33ece1f.zip | |
ARM: 8332/1: add CONFIG_VDSO Kconfig and Makefile bits
Allow users to enable the vdso in Kconfig; include the vdso in the
build if CONFIG_VDSO is enabled. Add 'vdso_install' target.
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Makefile | 8 | ||||
| -rw-r--r-- | arch/arm/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/mm/Kconfig | 14 |
3 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 7f99cd652203..6c13a84b6cd2 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -263,6 +263,7 @@ core-$(CONFIG_FPE_FASTFPE) += $(FASTFPE_OBJ) core-$(CONFIG_VFP) += arch/arm/vfp/ core-$(CONFIG_XEN) += arch/arm/xen/ core-$(CONFIG_KVM_ARM_HOST) += arch/arm/kvm/ +core-$(CONFIG_VDSO) += arch/arm/vdso/ # If we have a machine-specific directory, then include it in the build. core-y += arch/arm/kernel/ arch/arm/mm/ arch/arm/common/ @@ -320,6 +321,12 @@ dtbs: prepare scripts dtbs_install: $(Q)$(MAKE) $(dtbinst)=$(boot)/dts +PHONY += vdso_install +vdso_install: +ifeq ($(CONFIG_VDSO),y) + $(Q)$(MAKE) $(build)=arch/arm/vdso $@ +endif + # We use MRPROPER_FILES and CLEAN_FILES now archclean: $(Q)$(MAKE) $(clean)=$(boot) @@ -344,4 +351,5 @@ define archhelp echo ' Install using (your) ~/bin/$(INSTALLKERNEL) or' echo ' (distribution) /sbin/$(INSTALLKERNEL) or' echo ' install to $$(INSTALL_PATH) and run lilo' + echo ' vdso_install - Install unstripped vdso.so to $$(INSTALL_MOD_PATH)/vdso' endef diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile index 902397dd1000..3e316ca54e40 100644 --- a/arch/arm/kernel/Makefile +++ b/arch/arm/kernel/Makefile @@ -75,6 +75,7 @@ obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o perf_event_cpu.o CFLAGS_pj4-cp0.o := -marm AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o +obj-$(CONFIG_VDSO) += vdso.o ifneq ($(CONFIG_ARCH_EBSA110),y) obj-y += io.o diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 9b4f29e595a4..8a5f1e644104 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -825,6 +825,20 @@ 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 VDSO + bool "Enable VDSO for acceleration of some system calls" + depends on AEABI && MMU + default y if ARM_ARCH_TIMER + select GENERIC_TIME_VSYSCALL + help + Place in the process address space an ELF shared object + providing fast implementations of gettimeofday and + clock_gettime. Systems that implement the ARM architected + timer will receive maximum benefit. + + You must have glibc 2.22 or later for programs to seamlessly + take advantage of this. + config DMA_CACHE_RWFO bool "Enable read/write for ownership DMA cache maintenance" depends on CPU_V6K && SMP |