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| author | Adrian Hunter <adrian.hunter@intel.com> | 2024-03-25 09:40:05 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-04-08 16:03:06 +0300 |
| commit | c8e3a8b6f2e62661d838ae222774121ae23777a4 (patch) | |
| tree | 9c2956871845abea8bf2764245bc3be816d0c52a /arch/powerpc | |
| parent | 82ccdf062a64f3c4ac575c16179ce68edbbbe8e4 (diff) | |
| download | linux-c8e3a8b6f2e62661d838ae222774121ae23777a4.tar.xz | |
vdso: Consolidate vdso_calc_delta()
Consolidate vdso_calc_delta(), in preparation for further simplification.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240325064023.2997-2-adrian.hunter@intel.com
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/vdso/gettimeofday.h | 26 |
1 files changed, 11 insertions, 15 deletions
diff --git a/arch/powerpc/include/asm/vdso/gettimeofday.h b/arch/powerpc/include/asm/vdso/gettimeofday.h index 78302f6c2580..c6390890a60c 100644 --- a/arch/powerpc/include/asm/vdso/gettimeofday.h +++ b/arch/powerpc/include/asm/vdso/gettimeofday.h @@ -13,6 +13,17 @@ #define VDSO_HAS_TIME 1 +/* + * powerpc specific delta calculation. + * + * This variant removes the masking of the subtraction because the + * clocksource mask of all VDSO capable clocksources on powerpc is U64_MAX + * which would result in a pointless operation. The compiler cannot + * optimize it away as the mask comes from the vdso data and is not compile + * time constant. + */ +#define VDSO_DELTA_NOMASK 1 + static __always_inline int do_syscall_2(const unsigned long _r0, const unsigned long _r3, const unsigned long _r4) { @@ -104,21 +115,6 @@ static inline bool vdso_clocksource_ok(const struct vdso_data *vd) } #define vdso_clocksource_ok vdso_clocksource_ok -/* - * powerpc specific delta calculation. - * - * This variant removes the masking of the subtraction because the - * clocksource mask of all VDSO capable clocksources on powerpc is U64_MAX - * which would result in a pointless operation. The compiler cannot - * optimize it away as the mask comes from the vdso data and is not compile - * time constant. - */ -static __always_inline u64 vdso_calc_delta(u64 cycles, u64 last, u64 mask, u32 mult) -{ - return (cycles - last) * mult; -} -#define vdso_calc_delta vdso_calc_delta - #ifndef __powerpc64__ static __always_inline u64 vdso_shift_ns(u64 ns, unsigned long shift) { |