* [PATCH 1/1] Move rdtsc_barrier() into the TSC vread method
@ 2009-05-25 9:02 Petr Tesarik
2009-05-28 12:18 ` [tip:x86/vdso] x86: move " tip-bot for Petr Tesarik
0 siblings, 1 reply; 2+ messages in thread
From: Petr Tesarik @ 2009-05-25 9:02 UTC (permalink / raw)
To: linux-kernel, tglx, andi; +Cc: Petr Tesarik, Ingo Molnar, stable
The *fence instructions were moved to vsyscall_64.c by commit
cb9e35dce94a1b9c59d46224e8a94377d673e204. But this breaks the
vDSO, because vread methods are also called from there.
Besides, the synchronization might be unnecessary for other
time sources than TSC.
Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
---
arch/x86/kernel/tsc.c | 11 ++++++++++-
arch/x86/kernel/vsyscall_64.c | 8 --------
2 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index d57de05..cf8611d 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -710,7 +710,16 @@ static cycle_t read_tsc(struct clocksource *cs)
#ifdef CONFIG_X86_64
static cycle_t __vsyscall_fn vread_tsc(void)
{
- cycle_t ret = (cycle_t)vget_cycles();
+ cycle_t ret;
+
+ /*
+ * Surround the RDTSC by barriers, to make sure it's not
+ * speculated to outside the seqlock critical section and
+ * does not cause time warps:
+ */
+ rdtsc_barrier();
+ ret = (cycle_t)vget_cycles();
+ rdtsc_barrier();
return ret >= __vsyscall_gtod_data.clock.cycle_last ?
ret : __vsyscall_gtod_data.clock.cycle_last;
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index 44153af..25ee06a 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -132,15 +132,7 @@ static __always_inline void do_vgettimeofday(struct timeval * tv)
return;
}
- /*
- * Surround the RDTSC by barriers, to make sure it's not
- * speculated to outside the seqlock critical section and
- * does not cause time warps:
- */
- rdtsc_barrier();
now = vread();
- rdtsc_barrier();
-
base = __vsyscall_gtod_data.clock.cycle_last;
mask = __vsyscall_gtod_data.clock.mask;
mult = __vsyscall_gtod_data.clock.mult;
--
1.6.0.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [tip:x86/vdso] x86: move rdtsc_barrier() into the TSC vread method
2009-05-25 9:02 [PATCH 1/1] Move rdtsc_barrier() into the TSC vread method Petr Tesarik
@ 2009-05-28 12:18 ` tip-bot for Petr Tesarik
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot for Petr Tesarik @ 2009-05-28 12:18 UTC (permalink / raw)
To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, stable, ptesarik, tglx
Commit-ID: 7d96fd41cadc55f4e00231c8c71b8e25c779f122
Gitweb: http://git.kernel.org/tip/7d96fd41cadc55f4e00231c8c71b8e25c779f122
Author: Petr Tesarik <ptesarik@suse.cz>
AuthorDate: Mon, 25 May 2009 11:02:02 +0200
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Thu, 28 May 2009 14:15:54 +0200
x86: move rdtsc_barrier() into the TSC vread method
The *fence instructions were moved to vsyscall_64.c by commit
cb9e35dce94a1b9c59d46224e8a94377d673e204. But this breaks the
vDSO, because vread methods are also called from there.
Besides, the synchronization might be unnecessary for other
time sources than TSC.
[ Impact: fix potential time warp in VDSO ]
Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
LKML-Reference: <9d0ea9ea0f866bdc1f4d76831221ae117f11ea67.1243241859.git.ptesarik@suse.cz>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@kernel.org>
---
arch/x86/kernel/tsc.c | 11 ++++++++++-
arch/x86/kernel/vsyscall_64.c | 8 --------
2 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index d57de05..cf8611d 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -710,7 +710,16 @@ static cycle_t read_tsc(struct clocksource *cs)
#ifdef CONFIG_X86_64
static cycle_t __vsyscall_fn vread_tsc(void)
{
- cycle_t ret = (cycle_t)vget_cycles();
+ cycle_t ret;
+
+ /*
+ * Surround the RDTSC by barriers, to make sure it's not
+ * speculated to outside the seqlock critical section and
+ * does not cause time warps:
+ */
+ rdtsc_barrier();
+ ret = (cycle_t)vget_cycles();
+ rdtsc_barrier();
return ret >= __vsyscall_gtod_data.clock.cycle_last ?
ret : __vsyscall_gtod_data.clock.cycle_last;
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index 44153af..25ee06a 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -132,15 +132,7 @@ static __always_inline void do_vgettimeofday(struct timeval * tv)
return;
}
- /*
- * Surround the RDTSC by barriers, to make sure it's not
- * speculated to outside the seqlock critical section and
- * does not cause time warps:
- */
- rdtsc_barrier();
now = vread();
- rdtsc_barrier();
-
base = __vsyscall_gtod_data.clock.cycle_last;
mask = __vsyscall_gtod_data.clock.mask;
mult = __vsyscall_gtod_data.clock.mult;
^ permalink raw reply related [flat|nested] 2+ messages in thread
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