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Date: Fri, 14 Jun 2019 13:10:58 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: Vincenzo Frascino <vincenzo.frascino@....com>
cc: linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Arnd Bergmann <arnd@...db.de>,
Russell King <linux@...linux.org.uk>,
Ralf Baechle <ralf@...ux-mips.org>,
Paul Burton <paul.burton@...s.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Mark Salyzyn <salyzyn@...roid.com>,
Peter Collingbourne <pcc@...gle.com>,
Shuah Khan <shuah@...nel.org>,
Dmitry Safonov <0x7f454c46@...il.com>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Huw Davies <huw@...eweavers.com>
Subject: Re: [PATCH v6 03/19] kernel: Unify update_vsyscall implementation
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,
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);
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