[to-be-updated] ia64-fix-clock_getreclock_monotonic-to-report-itc-frequency.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: ia64: fix clock_getre(CLOCK_MONOTONIC) to report ITC frequency
has been removed from the -mm tree.  Its filename was
     ia64-fix-clock_getreclock_monotonic-to-report-itc-frequency.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: Sergei Trofimovich <slyich@gmail.com>
Subject: ia64: fix clock_getre(CLOCK_MONOTONIC) to report ITC frequency
Date: Mon, 15 Aug 2022 06:49:44 +0100

clock_gettime(CLOCK_MONOTONIC, &tp) is very precise on ia64 as it uses
ITC (similar to rdtsc on x86). It's not quite a hrtimer as it is a few
times slower than 1ns. Usually 2-3ns.

clock_getres(CLOCK_MONOTONIC, &res) never reflected that fact and
reported 0.04s precision (1/HZ value).

In https://bugs.gentoo.org/596382 gstreamer's test suite failed loudly
when it noticed precision discrepancy.

Before the change:

    clock_getres(CLOCK_MONOTONIC, &res) reported 250Hz precision.

After the change:

    clock_getres(CLOCK_MONOTONIC, &res) reports ITC (400Mhz) precision.

The patch is based on matoro's fix. It adds a bit of explanation why we
need to special-case arch-specific clock_getres().

Link: https://lkml.kernel.org/r/20220815054944.4130786-1-slyich@gmail.com
Signed-off-by: Sergei Trofimovich <slyich@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/ia64/kernel/sys_ia64.c           |   26 ++++++++++++++++++++++++
 arch/ia64/kernel/syscalls/syscall.tbl |    2 -
 2 files changed, 27 insertions(+), 1 deletion(-)

--- a/arch/ia64/kernel/syscalls/syscall.tbl~ia64-fix-clock_getreclock_monotonic-to-report-itc-frequency
+++ a/arch/ia64/kernel/syscalls/syscall.tbl
@@ -240,7 +240,7 @@
 228	common	timer_delete			sys_timer_delete
 229	common	clock_settime			sys_clock_settime
 230	common	clock_gettime			sys_clock_gettime
-231	common	clock_getres			sys_clock_getres
+231	common	clock_getres			ia64_clock_getres
 232	common	clock_nanosleep			sys_clock_nanosleep
 233	common	fstatfs64			sys_fstatfs64
 234	common	statfs64			sys_statfs64
--- a/arch/ia64/kernel/sys_ia64.c~ia64-fix-clock_getreclock_monotonic-to-report-itc-frequency
+++ a/arch/ia64/kernel/sys_ia64.c
@@ -166,3 +166,29 @@ ia64_mremap (unsigned long addr, unsigne
 		force_successful_syscall_return();
 	return addr;
 }
+
+asmlinkage long
+ia64_clock_getres(const clockid_t which_clock, struct __kernel_timespec __user *tp)
+{
+	/*
+	 * ia64's clock_gettime() syscall is implemented as a vdso call
+	 * fsys_clock_gettime(). Currently it handles only
+	 * CLOCK_REALTIME and CLOCK_MONOTONIC. Both are based on
+	 * 'ar.itc' counter which gets incremented at a constant
+	 * frequency. It's usually 400MHz, ~2.5x times slower than CPU
+	 * clock frequency. Which is almost a 1ns hrtimer, but not quite.
+	 *
+	 * Let's special-case these timers to report correct precision
+	 * based on ITC frequency and not HZ frequency for supported
+	 * clocks.
+	 */
+	switch (which_clock) {
+		case CLOCK_REALTIME:
+		case CLOCK_MONOTONIC:
+			s64 tick_ns = DIV_ROUND_UP(NSEC_PER_SEC, local_cpu_data->itc_freq);
+			struct timespec64 rtn_tp = ns_to_timespec64(tick_ns);
+			return put_timespec64(&rtn_tp, tp);
+	}
+
+	return sys_clock_getres(which_clock, tp);
+}
_

Patches currently in -mm which might be from slyich@gmail.com are