diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2020-08-04 22:37:48 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-08-06 10:57:30 +0200 |
| commit | 4c5a116ada953b86125ab7c70a57c57463a55a55 (patch) | |
| tree | 3c160c281da5e710dfa196cf9243caacf18462bc /arch/arm64 | |
| parent | 2324d50d051ec0f14a548e78554fb02513d6dcef (diff) | |
vdso/treewide: Add vdso_data pointer argument to __arch_get_hw_counter()
MIPS already uses and S390 will need the vdso data pointer in
__arch_get_hw_counter().
This works nicely as long as the architecture does not support time
namespaces in the VDSO. With time namespaces enabled the regular
accessor to the vdso data pointer __arch_get_vdso_data() will return the
namespace specific VDSO data page for tasks which are part of a
non-root time namespace. This would cause the architectures which need
the vdso data pointer in __arch_get_hw_counter() to access the wrong
vdso data page.
Add a vdso_data pointer argument to __arch_get_hw_counter() and hand it in
from the call sites in the core code. For architectures which do not need
the data pointer in their counter accessor function the compiler will just
optimize it out.
Fix up all existing architecture implementations and make MIPS utilize the
pointer instead of invoking the accessor function.
No functional change and no change in the resulting object code (except
MIPS).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/draft-87wo2ekuzn.fsf@nanos.tec.linutronix.de
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/include/asm/vdso/compat_gettimeofday.h | 3 | ||||
| -rw-r--r-- | arch/arm64/include/asm/vdso/gettimeofday.h | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/vdso/compat_gettimeofday.h b/arch/arm64/include/asm/vdso/compat_gettimeofday.h index 75cbae60455b..7508b0ac1d21 100644 --- a/arch/arm64/include/asm/vdso/compat_gettimeofday.h +++ b/arch/arm64/include/asm/vdso/compat_gettimeofday.h @@ -103,7 +103,8 @@ int clock_getres32_fallback(clockid_t _clkid, struct old_timespec32 *_ts) return ret; } -static __always_inline u64 __arch_get_hw_counter(s32 clock_mode) +static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, + const struct vdso_data *vd) { u64 res; diff --git a/arch/arm64/include/asm/vdso/gettimeofday.h b/arch/arm64/include/asm/vdso/gettimeofday.h index 9c29ad3049f8..631ab1281633 100644 --- a/arch/arm64/include/asm/vdso/gettimeofday.h +++ b/arch/arm64/include/asm/vdso/gettimeofday.h @@ -64,7 +64,8 @@ int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts) return ret; } -static __always_inline u64 __arch_get_hw_counter(s32 clock_mode) +static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, + const struct vdso_data *vd) { u64 res; |