diff options
| author | Mark Salyzyn <salyzyn@google.com> | 2017-08-17 09:16:27 -0700 |
|---|---|---|
| committer | Davide Garberi <dade.garberi@gmail.com> | 2021-10-07 16:16:08 +0200 |
| commit | 43ef9d1a0ca7d0e401067f4b832830445175a14e (patch) | |
| tree | 481b74c06515f3cb310d6178ad5b9710f033e4b6 | |
| parent | 150f6ae9257a6d0242b6318be013032dbd021f9c (diff) | |
FROMLIST: [PATCH v5 08/12] arm: vdso: Add ARCH_CLOCK_FIXED_MASK
(cherry picked from url https://patchwork.kernel.org/patch/10044543/)
Take an effort to recode the arm64 vdso code from assembler to C
previously submitted by Andrew Pinski <apinski@cavium.com>, rework
it for use in both arm and arm64, overlapping any optimizations
for each architecture. But instead of landing it in arm64, land the
result into lib/vdso and unify both implementations to simplify
future maintenance.
Add ARCH_CLOCK_FIXED_MASK as an efficiency since arm64 has no
purpose for cs_mask vdso_data variable.
Signed-off-by: Mark Salyzyn <salyzyn@android.com>
Cc: James Morse <james.morse@arm.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Andrew Pinski <apinski@cavium.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Bug: 63737556
Bug: 20057882
Change-Id: Iadf94bed6166d2ee43bb46bdf54636618e4b8854
| -rw-r--r-- | arch/arm/vdso/vgettimeofday.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/arm/vdso/vgettimeofday.c b/arch/arm/vdso/vgettimeofday.c index a354586f8a65..3005479efbe8 100644 --- a/arch/arm/vdso/vgettimeofday.c +++ b/arch/arm/vdso/vgettimeofday.c @@ -128,7 +128,11 @@ static notrace int do_realtime(const struct vdso_data *vd, struct timespec *ts) { u32 seq, mult, shift; u64 nsec, cycle_last; +#ifdef ARCH_CLOCK_FIXED_MASK + static const u64 mask = ARCH_CLOCK_FIXED_MASK; +#else u64 mask; +#endif vdso_xtime_clock_sec_t sec; do { @@ -141,7 +145,9 @@ static notrace int do_realtime(const struct vdso_data *vd, struct timespec *ts) mult = vd->cs_mono_mult; shift = vd->cs_shift; +#ifndef ARCH_CLOCK_FIXED_MASK mask = vd->cs_mask; +#endif sec = vd->xtime_clock_sec; nsec = vd->xtime_clock_snsec; @@ -161,7 +167,11 @@ static notrace int do_monotonic(const struct vdso_data *vd, struct timespec *ts) { u32 seq, mult, shift; u64 nsec, cycle_last; +#ifdef ARCH_CLOCK_FIXED_MASK + static const u64 mask = ARCH_CLOCK_FIXED_MASK; +#else u64 mask; +#endif vdso_wtm_clock_nsec_t wtm_nsec; __kernel_time_t sec; @@ -175,7 +185,9 @@ static notrace int do_monotonic(const struct vdso_data *vd, struct timespec *ts) mult = vd->cs_mono_mult; shift = vd->cs_shift; +#ifndef ARCH_CLOCK_FIXED_MASK mask = vd->cs_mask; +#endif sec = vd->xtime_clock_sec; nsec = vd->xtime_clock_snsec; @@ -200,7 +212,11 @@ static notrace int do_monotonic_raw(const struct vdso_data *vd, { u32 seq, mult, shift; u64 nsec, cycle_last; +#ifdef ARCH_CLOCK_FIXED_MASK + static const u64 mask = ARCH_CLOCK_FIXED_MASK; +#else u64 mask; +#endif vdso_raw_time_sec_t sec; do { @@ -213,7 +229,9 @@ static notrace int do_monotonic_raw(const struct vdso_data *vd, mult = vd->cs_raw_mult; shift = vd->cs_shift; +#ifndef ARCH_CLOCK_FIXED_MASK mask = vd->cs_mask; +#endif sec = vd->raw_time_sec; nsec = vd->raw_time_nsec; |