mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-20 11:13:58 +08:00
00b26474c2
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
37 lines
874 B
Plaintext
37 lines
874 B
Plaintext
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
config HAVE_GENERIC_VDSO
|
|
bool
|
|
|
|
if HAVE_GENERIC_VDSO
|
|
|
|
config GENERIC_GETTIMEOFDAY
|
|
bool
|
|
help
|
|
This is a generic implementation of gettimeofday vdso.
|
|
Each architecture that enables this feature has to
|
|
provide the fallback implementation.
|
|
|
|
config GENERIC_VDSO_32
|
|
bool
|
|
depends on GENERIC_GETTIMEOFDAY && !64BIT
|
|
help
|
|
This config option helps to avoid possible performance issues
|
|
in 32 bit only architectures.
|
|
|
|
config GENERIC_COMPAT_VDSO
|
|
bool
|
|
help
|
|
This config option enables the compat VDSO layer.
|
|
|
|
config CROSS_COMPILE_COMPAT_VDSO
|
|
string "32 bit Toolchain prefix for compat vDSO"
|
|
default ""
|
|
depends on GENERIC_COMPAT_VDSO
|
|
help
|
|
Defines the cross-compiler prefix for compiling compat vDSO.
|
|
If a 64 bit compiler (i.e. x86_64) can compile the VDSO for
|
|
32 bit, it does not need to define this parameter.
|
|
|
|
endif
|