1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 2
3 config HAVE_GENERIC_VDSO 3 config HAVE_GENERIC_VDSO
4 bool 4 bool
5 5
6 if HAVE_GENERIC_VDSO 6 if HAVE_GENERIC_VDSO
7 7
8 config GENERIC_GETTIMEOFDAY 8 config GENERIC_GETTIMEOFDAY
9 bool 9 bool
10 help 10 help
11 This is a generic implementation of 11 This is a generic implementation of gettimeofday vdso.
12 Each architecture that enables this 12 Each architecture that enables this feature has to
13 provide the fallback implementation. 13 provide the fallback implementation.
14 14
15 config GENERIC_VDSO_32 15 config GENERIC_VDSO_32
16 bool 16 bool
17 depends on GENERIC_GETTIMEOFDAY && !64 17 depends on GENERIC_GETTIMEOFDAY && !64BIT
18 help 18 help
19 This config option helps to avoid po 19 This config option helps to avoid possible performance issues
20 in 32 bit only architectures. 20 in 32 bit only architectures.
21 21
22 config GENERIC_COMPAT_VDSO 22 config GENERIC_COMPAT_VDSO
23 bool 23 bool
24 help 24 help
25 This config option enables the compa 25 This config option enables the compat VDSO layer.
26 26
27 config GENERIC_VDSO_TIME_NS 27 config GENERIC_VDSO_TIME_NS
28 bool 28 bool
29 help 29 help
30 Selected by architectures which supp 30 Selected by architectures which support time namespaces in the
31 VDSO 31 VDSO
32 32
33 config GENERIC_VDSO_OVERFLOW_PROTECT 33 config GENERIC_VDSO_OVERFLOW_PROTECT
34 bool 34 bool
35 help 35 help
36 Select to add multiplication overflo 36 Select to add multiplication overflow protection to the VDSO
37 time getter functions for the price 37 time getter functions for the price of an extra conditional
38 in the hotpath. 38 in the hotpath.
39 39
40 endif 40 endif
41 41
42 config VDSO_GETRANDOM 42 config VDSO_GETRANDOM
43 bool 43 bool
44 help 44 help
45 Selected by architectures that suppo 45 Selected by architectures that support vDSO getrandom().
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