search for: do_hres

...FIG_HYPERV_TSCPAGE - else if (gtod->vclock_mode == VCLOCK_HVCLOCK) - cycles = vread_hvclock(mode); + else if (mode == VCLOCK_HVCLOCK) + return vread_hvclock(); #endif - else - return 0; - v = cycles - gtod->cycle_last; - return v * gtod->mult; + return U64_MAX; } notrace static int do_hres(clockid_t clk, struct timespec *ts) { struct vgtod_ts *base = &gtod->basetime[clk]; unsigned int seq; - int mode; - u64 ns; + u64 cycles, ns; do { seq = gtod_read_begin(gtod); - mode = gtod->vclock_mode; ts->tv_sec = base->sec; ns = base->nsec; - ns += vgetsns...

Matt attempted to add CLOCK_TAI support to the VDSO clock_gettime() implementation, which extended the clockid switch case and added yet another slightly different copy of the same code. Especially the extended switch case is problematic as the compiler tends to generate a jump table which then requires to use retpolines. If jump tables are disabled it adds yet another conditional to the existing

Matt attempted to add CLOCK_TAI support to the VDSO clock_gettime() implementation, which extended the clockid switch case and added yet another slightly different copy of the same code. Especially the extended switch case is problematic as the compiler tends to generate a jump table which then requires to use retpolines. If jump tables are disabled it adds yet another conditional to the existing

Matt attempted to add CLOCK_TAI support to the VDSO clock_gettime() implementation, which extended the clockid switch case and added yet another slightly different copy of the same code. Especially the extended switch case is problematic as the compiler tends to generate a jump table which then requires to use retpolines. If jump tables are disabled it adds yet another conditional to the existing

...call_gtod.c | 4 ++++ arch/x86/include/asm/vgtod.h | 6 +++++- 3 files changed, 10 insertions(+), 2 deletions(-) --- a/arch/x86/entry/vdso/vclock_gettime.c +++ b/arch/x86/entry/vdso/vclock_gettime.c @@ -140,7 +140,7 @@ notrace static inline u64 vgetcyc(int mo notrace static int do_hres(clockid_t clk, struct timespec *ts) { - struct vgtod_ts *base = &gtod->basetime[clk]; + struct vgtod_ts *base = &gtod->basetime[clk & VGTOD_HRES_MASK]; u64 cycles, last, ns; unsigned int seq; --- a/arch/x86/entry/vsyscall/vsyscall_gtod.c +++ b/arch/x86/entry/vsyscall/vsysca...

...race static inline u64 vgetcyc(int mode) { if (mode == VCLOCK_TSC) - return vread_tsc(); + return (u64)rdtsc_ordered(); #ifdef CONFIG_PARAVIRT_CLOCK else if (mode == VCLOCK_PVCLOCK) return vread_pvclock(); @@ -168,17 +141,19 @@ notrace static inline u64 vgetcyc(int mo notrace static int do_hres(clockid_t clk, struct timespec *ts) { struct vgtod_ts *base = &gtod->basetime[clk]; + u64 cycles, last, ns; unsigned int seq; - u64 cycles, ns; do { seq = gtod_read_begin(gtod); ts->tv_sec = base->sec; ns = base->nsec; + last = gtod->cycle_last; cycles = vge...

...6/include/asm/vgtod.h | 6 +++++- > 3 files changed, 10 insertions(+), 2 deletions(-) > > --- a/arch/x86/entry/vdso/vclock_gettime.c > +++ b/arch/x86/entry/vdso/vclock_gettime.c > @@ -140,7 +140,7 @@ notrace static inline u64 vgetcyc(int mo > > notrace static int do_hres(clockid_t clk, struct timespec *ts) > { > - struct vgtod_ts *base = &gtod->basetime[clk]; > + struct vgtod_ts *base = &gtod->basetime[clk & VGTOD_HRES_MASK]; > u64 cycles, last, ns; > unsigned int seq; > > --- a/arch/x86/entry/vsyscall/vsyscall_gt...

...6/include/asm/vgtod.h | 6 +++++- > 3 files changed, 10 insertions(+), 2 deletions(-) > > --- a/arch/x86/entry/vdso/vclock_gettime.c > +++ b/arch/x86/entry/vdso/vclock_gettime.c > @@ -140,7 +140,7 @@ notrace static inline u64 vgetcyc(int mo > > notrace static int do_hres(clockid_t clk, struct timespec *ts) > { > - struct vgtod_ts *base = &gtod->basetime[clk]; > + struct vgtod_ts *base = &gtod->basetime[clk & VGTOD_HRES_MASK]; > u64 cycles, last, ns; > unsigned int seq; > > --- a/arch/x86/entry/vsyscall/vsyscall_gt...