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linux-next/lib/vdso/Makefile
Vincenzo Frascino 00b26474c2 lib/vdso: Provide generic VDSO implementation
In the last few years the kernel gained quite some architecture specific
vdso implementations which contain very similar code.

Introduce a generic VDSO implementation of gettimeofday() which will be
shareable between architectures once they are converted over.

The implementation is based on the current x86 VDSO code.

[ tglx: Massaged changelog and made the kernel doc tabular ]

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Shijith Thotton <sthotton@marvell.com>
Tested-by: Andre Przywara <andre.przywara@arm.com>
Cc: linux-arch@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mips@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Mark Salyzyn <salyzyn@android.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Dmitry Safonov <0x7f454c46@gmail.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Huw Davies <huw@codeweavers.com>
Link: https://lkml.kernel.org/r/20190621095252.32307-3-vincenzo.frascino@arm.com
2019-06-22 21:21:05 +02:00

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Makefile

# SPDX-License-Identifier: GPL-2.0
GENERIC_VDSO_MK_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
GENERIC_VDSO_DIR := $(dir $(GENERIC_VDSO_MK_PATH))
c-gettimeofday-$(CONFIG_GENERIC_GETTIMEOFDAY) := $(addprefix $(GENERIC_VDSO_DIR), gettimeofday.c)
# This cmd checks that the vdso library does not contain absolute relocation
# It has to be called after the linking of the vdso library and requires it
# as a parameter.
#
# $(ARCH_REL_TYPE_ABS) is defined in the arch specific makefile and corresponds
# to the absolute relocation types printed by "objdump -R" and accepted by the
# dynamic linker.
ifndef ARCH_REL_TYPE_ABS
$(error ARCH_REL_TYPE_ABS is not set)
endif
quiet_cmd_vdso_check = VDSOCHK $@
cmd_vdso_check = if $(OBJDUMP) -R $@ | egrep -h "$(ARCH_REL_TYPE_ABS)"; \
then (echo >&2 "$@: dynamic relocations are not supported"; \
rm -f $@; /bin/false); fi