From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
dima@arista.com, avagin@gmail.com, arnd@arndb.de,
tglx@linutronix.de, vincenzo.frascino@arm.com, luto@kernel.org,
linux-arch@vger.kernel.org
Subject: [PATCH RESEND v1 2/4] lib/vdso: Add vdso_data pointer as input to __arch_get_timens_vdso_data()
Date: Wed, 31 Mar 2021 16:48:45 +0000 (UTC) [thread overview]
Message-ID: <539c4204b1baa77c55f758904a1ea239abbc7a5c.1617209142.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <cover.1617209141.git.christophe.leroy@csgroup.eu>
For the same reason as commit e876f0b69dc9 ("lib/vdso: Allow
architectures to provide the vdso data pointer"), powerpc wants to
avoid calculation of relative position to code.
As the timens_vdso_data is next page to vdso_data, provide
vdso_data pointer to __arch_get_timens_vdso_data() in order
to ease the calculation on powerpc in following patches.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/arm64/include/asm/vdso/compat_gettimeofday.h | 3 ++-
arch/arm64/include/asm/vdso/gettimeofday.h | 2 +-
arch/s390/include/asm/vdso/gettimeofday.h | 3 ++-
arch/x86/include/asm/vdso/gettimeofday.h | 3 ++-
lib/vdso/gettimeofday.c | 15 +++++++++------
5 files changed, 16 insertions(+), 10 deletions(-)
diff --git a/arch/arm64/include/asm/vdso/compat_gettimeofday.h b/arch/arm64/include/asm/vdso/compat_gettimeofday.h
index 7508b0ac1d21..ecb6fd4c3c64 100644
--- a/arch/arm64/include/asm/vdso/compat_gettimeofday.h
+++ b/arch/arm64/include/asm/vdso/compat_gettimeofday.h
@@ -155,7 +155,8 @@ static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
}
#ifdef CONFIG_TIME_NS
-static __always_inline const struct vdso_data *__arch_get_timens_vdso_data(void)
+static __always_inline
+const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
{
const struct vdso_data *ret;
diff --git a/arch/arm64/include/asm/vdso/gettimeofday.h b/arch/arm64/include/asm/vdso/gettimeofday.h
index 631ab1281633..de86230a9436 100644
--- a/arch/arm64/include/asm/vdso/gettimeofday.h
+++ b/arch/arm64/include/asm/vdso/gettimeofday.h
@@ -100,7 +100,7 @@ const struct vdso_data *__arch_get_vdso_data(void)
#ifdef CONFIG_TIME_NS
static __always_inline
-const struct vdso_data *__arch_get_timens_vdso_data(void)
+const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
{
return _timens_data;
}
diff --git a/arch/s390/include/asm/vdso/gettimeofday.h b/arch/s390/include/asm/vdso/gettimeofday.h
index ed89ef742530..383c53c3dddd 100644
--- a/arch/s390/include/asm/vdso/gettimeofday.h
+++ b/arch/s390/include/asm/vdso/gettimeofday.h
@@ -68,7 +68,8 @@ long clock_getres_fallback(clockid_t clkid, struct __kernel_timespec *ts)
}
#ifdef CONFIG_TIME_NS
-static __always_inline const struct vdso_data *__arch_get_timens_vdso_data(void)
+static __always_inline
+const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
{
return _timens_data;
}
diff --git a/arch/x86/include/asm/vdso/gettimeofday.h b/arch/x86/include/asm/vdso/gettimeofday.h
index df01d7349d79..1936f21ed8cd 100644
--- a/arch/x86/include/asm/vdso/gettimeofday.h
+++ b/arch/x86/include/asm/vdso/gettimeofday.h
@@ -58,7 +58,8 @@ extern struct ms_hyperv_tsc_page hvclock_page
#endif
#ifdef CONFIG_TIME_NS
-static __always_inline const struct vdso_data *__arch_get_timens_vdso_data(void)
+static __always_inline
+const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
{
return __timens_vdso_data;
}
diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c
index c6f6dee08746..ce2f69552003 100644
--- a/lib/vdso/gettimeofday.c
+++ b/lib/vdso/gettimeofday.c
@@ -49,13 +49,15 @@ static inline bool vdso_cycles_ok(u64 cycles)
static __always_inline int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
struct __kernel_timespec *ts)
{
- const struct vdso_data *vd = __arch_get_timens_vdso_data();
+ const struct vdso_data *vd;
const struct timens_offset *offs = &vdns->offset[clk];
const struct vdso_timestamp *vdso_ts;
u64 cycles, last, ns;
u32 seq;
s64 sec;
+ vd = vdns - (clk == CLOCK_MONOTONIC_RAW ? CS_RAW : CS_HRES_COARSE);
+ vd = __arch_get_timens_vdso_data(vd);
if (clk != CLOCK_MONOTONIC_RAW)
vd = &vd[CS_HRES_COARSE];
else
@@ -92,7 +94,8 @@ static __always_inline int do_hres_timens(const struct vdso_data *vdns, clockid_
return 0;
}
#else
-static __always_inline const struct vdso_data *__arch_get_timens_vdso_data(void)
+static __always_inline
+const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
{
return NULL;
}
@@ -162,7 +165,7 @@ static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
static __always_inline int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
struct __kernel_timespec *ts)
{
- const struct vdso_data *vd = __arch_get_timens_vdso_data();
+ const struct vdso_data *vd = __arch_get_timens_vdso_data(vdns);
const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
const struct timens_offset *offs = &vdns->offset[clk];
u64 nsec;
@@ -310,7 +313,7 @@ __cvdso_gettimeofday_data(const struct vdso_data *vd,
if (unlikely(tz != NULL)) {
if (IS_ENABLED(CONFIG_TIME_NS) &&
vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
- vd = __arch_get_timens_vdso_data();
+ vd = __arch_get_timens_vdso_data(vd);
tz->tz_minuteswest = vd[CS_HRES_COARSE].tz_minuteswest;
tz->tz_dsttime = vd[CS_HRES_COARSE].tz_dsttime;
@@ -333,7 +336,7 @@ __cvdso_time_data(const struct vdso_data *vd, __kernel_old_time_t *time)
if (IS_ENABLED(CONFIG_TIME_NS) &&
vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
- vd = __arch_get_timens_vdso_data();
+ vd = __arch_get_timens_vdso_data(vd);
t = READ_ONCE(vd[CS_HRES_COARSE].basetime[CLOCK_REALTIME].sec);
@@ -363,7 +366,7 @@ int __cvdso_clock_getres_common(const struct vdso_data *vd, clockid_t clock,
if (IS_ENABLED(CONFIG_TIME_NS) &&
vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
- vd = __arch_get_timens_vdso_data();
+ vd = __arch_get_timens_vdso_data(vd);
/*
* Convert the clockid to a bitmask and use it to check which
--
2.25.0
next prev parent reply other threads:[~2021-03-31 16:49 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-31 16:48 [PATCH RESEND v1 0/4] powerpc/vdso: Add support for time namespaces Christophe Leroy
2021-03-31 16:48 ` [PATCH RESEND v1 1/4] lib/vdso: Mark do_hres_timens() and do_coarse_timens() __always_inline() Christophe Leroy
2021-04-12 12:47 ` Thomas Gleixner
2021-04-12 12:54 ` Vincenzo Frascino
2021-03-31 16:48 ` Christophe Leroy [this message]
2021-04-05 5:00 ` [PATCH RESEND v1 2/4] lib/vdso: Add vdso_data pointer as input to __arch_get_timens_vdso_data() Andrei Vagin
2021-04-12 12:48 ` Thomas Gleixner
2021-04-12 12:56 ` Vincenzo Frascino
2021-03-31 16:48 ` [PATCH RESEND v1 3/4] powerpc/vdso: Separate vvar vma from vdso Christophe Leroy
2021-04-05 5:03 ` Andrei Vagin
2021-04-12 12:58 ` Vincenzo Frascino
2021-03-31 16:48 ` [PATCH RESEND v1 4/4] powerpc/vdso: Add support for time namespaces Christophe Leroy
2021-04-05 4:50 ` Andrei Vagin
2021-04-12 13:00 ` Vincenzo Frascino
2021-04-12 12:49 ` [PATCH RESEND v1 0/4] " Thomas Gleixner
2021-04-13 6:31 ` Michael Ellerman
2021-04-19 4:00 ` Michael Ellerman
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