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| author | Ingo Molnar <mingo@elte.hu> | 2007-02-16 10:27:34 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 17:13:57 +0100 |
| commit | 95492e4646e5de8b43d9a7908d6177fb737b61f0 (patch) | |
| tree | ae25cd206ca76f78d50ac2a206ef012e0ab1d9df /include/asm-x86_64/proto.h | |
| parent | [PATCH] Simplify the registration of clocksources (diff) | |
| download | linux-95492e4646e5de8b43d9a7908d6177fb737b61f0.tar.xz linux-95492e4646e5de8b43d9a7908d6177fb737b61f0.zip | |
[PATCH] x86: rewrite SMP TSC sync code
make the TSC synchronization code more robust, and unify it between x86_64 and
i386.
The biggest change is the removal of the 'fix up TSCs' code on x86_64 and
i386, in some rare cases it was /causing/ time-warps on SMP systems.
The new code only checks for TSC asynchronity - and if it can prove a
time-warp (if it can observe the TSC going backwards when going from one CPU
to another within a critical section), then the TSC clock-source is turned
off.
The TSC synchronization-checking code also got moved into a separate file.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-x86_64/proto.h')
| -rw-r--r-- | include/asm-x86_64/proto.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h index a6d2ff5c69b7..2ce3adf7bfdc 100644 --- a/include/asm-x86_64/proto.h +++ b/include/asm-x86_64/proto.h @@ -91,8 +91,6 @@ extern void check_efer(void); extern int unhandled_signal(struct task_struct *tsk, int sig); -extern int unsynchronized_tsc(void); - extern void select_idle_routine(const struct cpuinfo_x86 *c); extern unsigned long table_start, table_end; |