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Subject[PATCH 3/3] x86/vdso: Add support for CLOCK_MONOTONIC_RAW in the vDSO
Date
This is particularly useful for Wine which needs to implement Win32
API clock functions whose values do not get adjusted by adjtimex().

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Huw Davies <huw@codeweavers.com>
---
arch/x86/entry/vsyscall/vsyscall_gtod.c | 6 ++++++
arch/x86/include/asm/vgtod.h | 3 ++-
2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/x86/entry/vsyscall/vsyscall_gtod.c b/arch/x86/entry/vsyscall/vsyscall_gtod.c
index ddc6a71df87c..fe3458caf301 100644
--- a/arch/x86/entry/vsyscall/vsyscall_gtod.c
+++ b/arch/x86/entry/vsyscall/vsyscall_gtod.c
@@ -68,6 +68,12 @@ void update_vsyscall(struct timekeeper *tk)
base->mult = tk->tkr_mono.mult;
base->shift = tk->tkr_mono.shift;

+ base = &vdata->basetime[CLOCK_MONOTONIC_RAW];
+ base->sec = tk->raw_sec;
+ base->nsec = tk->tkr_raw.xtime_nsec;
+ base->mult = tk->tkr_raw.mult;
+ base->shift = tk->tkr_raw.shift;
+
base = &vdata->basetime[CLOCK_REALTIME_COARSE];
base->sec = tk->xtime_sec;
base->nsec = tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift;
diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h
index ae0d76491595..0b76ba884e25 100644
--- a/arch/x86/include/asm/vgtod.h
+++ b/arch/x86/include/asm/vgtod.h
@@ -30,7 +30,8 @@ struct vgtod_ts {
};

#define VGTOD_BASES (CLOCK_TAI + 1)
-#define VGTOD_HRES (BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC) | BIT(CLOCK_TAI))
+#define VGTOD_HRES (BIT(CLOCK_REALTIME) | BIT(CLOCK_MONOTONIC) | \
+ BIT(CLOCK_MONOTONIC_RAW) | BIT(CLOCK_TAI))
#define VGTOD_COARSE (BIT(CLOCK_REALTIME_COARSE) | BIT(CLOCK_MONOTONIC_COARSE))

/*
--
2.17.1
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