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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-31 19:48:47 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-04-14 16:04:44 +0300 |
| commit | 74205b3fc2effde821b219d955c70e727dc43cc6 (patch) | |
| tree | 73fdf962ccea23430de4b5d350b4434d85173341 /arch/powerpc/include/asm/vdso | |
| parent | 1c4bce6753857dc409a0197342d18764e7f4b741 (diff) | |
| download | linux-74205b3fc2effde821b219d955c70e727dc43cc6.tar.xz | |
powerpc/vdso: Add support for time namespaces
This patch adds the necessary glue to provide time namespaces.
Things are mainly copied from ARM64.
__arch_get_timens_vdso_data() calculates timens vdso data position
based on the vdso data position, knowing it is the next page in vvar.
This avoids having to redo the mflr/bcl/mflr/mtlr dance to locate
the page relative to running code position.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> # vDSO parts
Acked-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1a15495f80ec19a87b16cf874dbf7c3fa5ec40fe.1617209142.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/include/asm/vdso')
| -rw-r--r-- | arch/powerpc/include/asm/vdso/gettimeofday.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/vdso/gettimeofday.h b/arch/powerpc/include/asm/vdso/gettimeofday.h index 77c635c2c90d..1faff0be1111 100644 --- a/arch/powerpc/include/asm/vdso/gettimeofday.h +++ b/arch/powerpc/include/asm/vdso/gettimeofday.h @@ -2,6 +2,8 @@ #ifndef _ASM_POWERPC_VDSO_GETTIMEOFDAY_H #define _ASM_POWERPC_VDSO_GETTIMEOFDAY_H +#include <asm/page.h> + #ifdef __ASSEMBLY__ #include <asm/ppc_asm.h> @@ -154,6 +156,14 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, const struct vdso_data *__arch_get_vdso_data(void); +#ifdef CONFIG_TIME_NS +static __always_inline +const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd) +{ + return (void *)vd + PAGE_SIZE; +} +#endif + static inline bool vdso_clocksource_ok(const struct vdso_data *vd) { return true; |