From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org,
linux-kselftest@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>, Arnd Bergmann <arnd@arndb.de>,
Russell King <linux@armlinux.org.uk>,
Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Mark Salyzyn <salyzyn@android.com>,
Peter Collingbourne <pcc@google.com>,
Shuah Khan <shuah@kernel.org>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Huw Davies <huw@codeweavers.com>
Subject: Re: [PATCH v6 03/19] kernel: Unify update_vsyscall implementation
Date: Fri, 14 Jun 2019 13:15:08 +0100
Message-ID: <a69e48a2-575d-255c-2653-d3e99b7ba760@arm.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1906141307430.1722@nanos.tec.linutronix.de>
Hi Thomas,
On 6/14/19 12:10 PM, Thomas Gleixner wrote:
> On Thu, 30 May 2019, Vincenzo Frascino wrote:
>> +
>> + if (__arch_use_vsyscall(vdata)) {
>> + vdata[CS_HRES_COARSE].cycle_last =
>> + tk->tkr_mono.cycle_last;
>> + vdata[CS_HRES_COARSE].mask =
>> + tk->tkr_mono.mask;
>> + vdata[CS_HRES_COARSE].mult =
>> + tk->tkr_mono.mult;
>
> These line breaks make it really hard to read. Can you fold in the patch
> below please?
>
Thanks for this. I will do it in v7.
> Thanks,
>
> tglx
> 8<-----------
> --- a/kernel/vdso/vsyscall.c
> +++ b/kernel/vdso/vsyscall.c
> @@ -11,6 +11,66 @@
> #include <vdso/helpers.h>
> #include <vdso/vsyscall.h>
>
> +static inline void udpate_vdata(struct vdso_data *vdata, struct timekeeper *tk)
> +{
> + struct vdso_timestamp *vdso_ts;
> + u64 nsec;
> +
> + vdata[CS_HRES_COARSE].cycle_last = tk->tkr_mono.cycle_last;
> + vdata[CS_HRES_COARSE].mask = tk->tkr_mono.mask;
> + vdata[CS_HRES_COARSE].mult = tk->tkr_mono.mult;
> + vdata[CS_HRES_COARSE].shift = tk->tkr_mono.shift;
> + vdata[CS_RAW].cycle_last = tk->tkr_raw.cycle_last;
> + vdata[CS_RAW].mask = tk->tkr_raw.mask;
> + vdata[CS_RAW].mult = tk->tkr_raw.mult;
> + vdata[CS_RAW].shift = tk->tkr_raw.shift;
> +
> + /* CLOCK_REALTIME */
> + vdso_ts = &vdata[CS_HRES_COARSE].basetime[CLOCK_REALTIME];
> + vdso_ts->sec = tk->xtime_sec;
> + vdso_ts->nsec = tk->tkr_mono.xtime_nsec;
> +
> + /* CLOCK_MONOTONIC */
> + vdso_ts = &vdata[CS_HRES_COARSE].basetime[CLOCK_MONOTONIC];
> + vdso_ts->sec = tk->xtime_sec + tk->wall_to_monotonic.tv_sec;
> +
> + nsec = tk->tkr_mono.xtime_nsec;
> + nsec += ((u64)tk->wall_to_monotonic.tv_nsec << tk->tkr_mono.shift);
> + while (nsec >= (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) {
> + nsec -= (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift);
> + vdso_ts->sec++;
> + }
> + vdso_ts->nsec = nsec;
> +
> + /* CLOCK_MONOTONIC_RAW */
> + vdso_ts = &vdata[CS_RAW].basetime[CLOCK_MONOTONIC_RAW];
> + vdso_ts->sec = tk->raw_sec;
> + vdso_ts->nsec = tk->tkr_raw.xtime_nsec;
> +
> + /* CLOCK_BOOTTIME */
> + vdso_ts = &vdata[CS_HRES_COARSE].basetime[CLOCK_BOOTTIME];
> + vdso_ts->sec = tk->xtime_sec + tk->wall_to_monotonic.tv_sec;
> + nsec = tk->tkr_mono.xtime_nsec;
> + nsec += ((u64)(tk->wall_to_monotonic.tv_nsec +
> + ktime_to_ns(tk->offs_boot)) << tk->tkr_mono.shift);
> + while (nsec >= (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) {
> + nsec -= (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift);
> + vdso_ts->sec++;
> + }
> + vdso_ts->nsec = nsec;
> +
> + /* CLOCK_TAI */
> + vdso_ts = &vdata[CS_HRES_COARSE].basetime[CLOCK_TAI];
> + vdso_ts->sec = tk->xtime_sec + (s64)tk->tai_offset;
> + vdso_ts->nsec = tk->tkr_mono.xtime_nsec;
> +
> + /*
> + * Read without the seqlock held by clock_getres().
> + * Note: No need to have a second copy.
> + */
> + WRITE_ONCE(vdata[CS_HRES_COARSE].hrtimer_res, hrtimer_resolution);
> +}
> +
> void update_vsyscall(struct timekeeper *tk)
> {
> struct vdso_data *vdata = __arch_get_k_vdso_data();
> @@ -32,92 +92,23 @@ void update_vsyscall(struct timekeeper *
> vdata[CS_RAW].clock_mode = __arch_get_clock_mode(tk);
>
> /* CLOCK_REALTIME_COARSE */
> - vdso_ts =
> - &vdata[CS_HRES_COARSE].basetime[CLOCK_REALTIME_COARSE];
> - vdso_ts->sec = tk->xtime_sec;
> - vdso_ts->nsec = tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift;
> + vdso_ts = &vdata[CS_HRES_COARSE].basetime[CLOCK_REALTIME_COARSE];
> + vdso_ts->sec = tk->xtime_sec;
> + vdso_ts->nsec = tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift;
> +
> /* CLOCK_MONOTONIC_COARSE */
> - vdso_ts =
> - &vdata[CS_HRES_COARSE].basetime[CLOCK_MONOTONIC_COARSE];
> - vdso_ts->sec = tk->xtime_sec + tk->wall_to_monotonic.tv_sec;
> - nsec = tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift;
> - nsec = nsec + tk->wall_to_monotonic.tv_nsec;
> + vdso_ts = &vdata[CS_HRES_COARSE].basetime[CLOCK_MONOTONIC_COARSE];
> + vdso_ts->sec = tk->xtime_sec + tk->wall_to_monotonic.tv_sec;
> + nsec = tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift;
> + nsec = nsec + tk->wall_to_monotonic.tv_nsec;
> while (nsec >= NSEC_PER_SEC) {
> nsec = nsec - NSEC_PER_SEC;
> vdso_ts->sec++;
> }
> - vdso_ts->nsec = nsec;
> + vdso_ts->nsec = nsec;
>
> - if (__arch_use_vsyscall(vdata)) {
> - vdata[CS_HRES_COARSE].cycle_last =
> - tk->tkr_mono.cycle_last;
> - vdata[CS_HRES_COARSE].mask =
> - tk->tkr_mono.mask;
> - vdata[CS_HRES_COARSE].mult =
> - tk->tkr_mono.mult;
> - vdata[CS_HRES_COARSE].shift =
> - tk->tkr_mono.shift;
> - vdata[CS_RAW].cycle_last =
> - tk->tkr_raw.cycle_last;
> - vdata[CS_RAW].mask =
> - tk->tkr_raw.mask;
> - vdata[CS_RAW].mult =
> - tk->tkr_raw.mult;
> - vdata[CS_RAW].shift =
> - tk->tkr_raw.shift;
> - /* CLOCK_REALTIME */
> - vdso_ts =
> - &vdata[CS_HRES_COARSE].basetime[CLOCK_REALTIME];
> - vdso_ts->sec = tk->xtime_sec;
> - vdso_ts->nsec = tk->tkr_mono.xtime_nsec;
> - /* CLOCK_MONOTONIC */
> - vdso_ts =
> - &vdata[CS_HRES_COARSE].basetime[CLOCK_MONOTONIC];
> - vdso_ts->sec = tk->xtime_sec +
> - tk->wall_to_monotonic.tv_sec;
> - nsec = tk->tkr_mono.xtime_nsec;
> - nsec = nsec +
> - ((u64)tk->wall_to_monotonic.tv_nsec <<
> - tk->tkr_mono.shift);
> - while (nsec >= (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) {
> - nsec = nsec -
> - (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift);
> - vdso_ts->sec++;
> - }
> - vdso_ts->nsec = nsec;
> - /* CLOCK_MONOTONIC_RAW */
> - vdso_ts =
> - &vdata[CS_RAW].basetime[CLOCK_MONOTONIC_RAW];
> - vdso_ts->sec = tk->raw_sec;
> - vdso_ts->nsec = tk->tkr_raw.xtime_nsec;
> - /* CLOCK_BOOTTIME */
> - vdso_ts =
> - &vdata[CS_HRES_COARSE].basetime[CLOCK_BOOTTIME];
> - vdso_ts->sec = tk->xtime_sec +
> - tk->wall_to_monotonic.tv_sec;
> - nsec = tk->tkr_mono.xtime_nsec;
> - nsec = nsec +
> - ((u64)(tk->wall_to_monotonic.tv_nsec +
> - ktime_to_ns(tk->offs_boot)) <<
> - tk->tkr_mono.shift);
> - while (nsec >= (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift)) {
> - nsec = nsec -
> - (((u64)NSEC_PER_SEC) << tk->tkr_mono.shift);
> - vdso_ts->sec++;
> - }
> - vdso_ts->nsec = nsec;
> - /* CLOCK_TAI */
> - vdso_ts =
> - &vdata[CS_HRES_COARSE].basetime[CLOCK_TAI];
> - vdso_ts->sec = tk->xtime_sec + (s64)tk->tai_offset;
> - vdso_ts->nsec = tk->tkr_mono.xtime_nsec;
> -
> - /*
> - * Read without the seqlock held by clock_getres().
> - * Note: No need to have a second copy.
> - */
> - WRITE_ONCE(vdata[CS_HRES_COARSE].hrtimer_res, hrtimer_resolution);
> - }
> + if (__arch_use_vsyscall(vdata))
> + update_vdata(vdata, tk);
>
> __arch_update_vsyscall(vdata, tk);
>
>
--
Regards,
Vincenzo
next prev parent reply index
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-30 14:15 [PATCH v6 00/19] Unify vDSOs across more architectures Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 01/19] kernel: Standardize vdso_datapage Vincenzo Frascino
2019-05-31 8:16 ` Arnd Bergmann
2019-06-04 12:05 ` Vincenzo Frascino
2019-06-10 17:47 ` Huw Davies
2019-06-10 9:27 ` Huw Davies
2019-06-10 10:17 ` Vincenzo Frascino
2019-06-10 10:31 ` Huw Davies
2019-06-10 11:07 ` Vincenzo Frascino
2019-06-10 11:37 ` Huw Davies
2019-05-30 14:15 ` [PATCH v6 02/19] kernel: Define gettimeofday vdso common code Vincenzo Frascino
2019-05-31 8:19 ` Arnd Bergmann
2019-06-04 12:08 ` Vincenzo Frascino
2019-06-10 9:31 ` Huw Davies
2019-06-10 10:18 ` Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 03/19] kernel: Unify update_vsyscall implementation Vincenzo Frascino
2019-06-10 9:34 ` Huw Davies
2019-06-10 10:19 ` Vincenzo Frascino
2019-06-14 11:10 ` Thomas Gleixner
2019-06-14 12:15 ` Vincenzo Frascino [this message]
2019-06-14 12:19 ` Thomas Gleixner
2019-06-14 12:25 ` Vincenzo Frascino
2019-06-14 13:07 ` Thomas Gleixner
2019-05-30 14:15 ` [PATCH v6 04/19] arm64: Substitute gettimeofday with C implementation Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 05/19] arm64: Build vDSO with -ffixed-x18 Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 06/19] arm64: compat: Add missing syscall numbers Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 07/19] arm64: compat: Expose signal related structures Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 08/19] arm64: compat: Generate asm offsets for signals Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 09/19] lib: vdso: Add compat support Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 10/19] arm64: compat: Add vDSO Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 11/19] arm64: Refactor vDSO code Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 12/19] arm64: compat: vDSO setup for compat layer Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 13/19] arm64: elf: vDSO code page discovery Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 14/19] arm64: compat: Get sigreturn trampolines from vDSO Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 15/19] arm64: Add vDSO compat support Vincenzo Frascino
2019-06-01 9:38 ` Catalin Marinas
2019-06-04 12:10 ` Vincenzo Frascino
2019-05-30 14:15 ` [PATCH v6 16/19] arm: Add support for generic vDSO Vincenzo Frascino
2019-05-31 8:32 ` Arnd Bergmann
2019-05-30 14:15 ` [PATCH v6 17/19] mips: " Vincenzo Frascino
2019-05-31 8:34 ` Arnd Bergmann
2019-06-03 14:54 ` Mark Salyzyn
2019-06-03 17:07 ` Arnd Bergmann
2019-05-30 14:15 ` [PATCH v6 18/19] x86: " Vincenzo Frascino
2019-05-30 15:41 ` Michael Kelley
2019-06-04 12:13 ` Vincenzo Frascino
2019-06-14 11:15 ` Thomas Gleixner
2019-06-14 21:17 ` Sasha Levin
2019-05-30 14:15 ` [PATCH v6 19/19] kselftest: Extend vDSO selftest Vincenzo Frascino
2019-05-31 8:53 ` Arnd Bergmann
2019-05-31 8:46 ` [PATCH v6 00/19] Unify vDSOs across more architectures Arnd Bergmann
2019-06-04 12:04 ` Vincenzo Frascino
2019-06-04 12:12 ` Arnd Bergmann
2019-06-05 14:32 ` Vincenzo Frascino
2019-06-14 12:16 ` Thomas Gleixner
2019-06-14 12:19 ` Vincenzo Frascino
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