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ARM: 8332/1: add CONFIG_VDSO Kconfig and Makefile bits

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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>
This commit is contained in:
Nathan Lynch 2015-03-25 19:16:05 +01:00 committed by Russell King
parent ecf99a4391
commit e5b61deb3a
3 changed files with 23 additions and 0 deletions
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8
arch/arm/Makefile
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@ -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

1
arch/arm/kernel/Makefile
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@ -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

14
arch/arm/mm/Kconfig
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@ -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