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[PATCH] x86-64: Fix bad assumption that dualcore cpus have synced TSCs

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This should resolve the issue seen in bugme bug #5105, where it is assumed
that dualcore x86_64 systems have synced TSCs.  This is not the case, and
alternate timesources should be used instead.

For more details, see:
http://bugzilla.kernel.org/show_bug.cgi?id=5105

Andi's earlier concerns that the TSCs should be synced on dualcore systems
have been resolved by confirmation from AMD folks that they can be
unsynced.

Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
john stultz 2005-09-27 21:45:36 -07:00 committed by Linus Torvalds
parent a9d014afc3
commit 6c132b5fe6
1 changed files with 0 additions and 3 deletions
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3
arch/x86_64/kernel/time.c
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@ -959,9 +959,6 @@ static __init int unsynchronized_tsc(void)
are handled in the OEM check above. */
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
return 0;
/* All in a single socket - should be synchronized */
if (cpus_weight(cpu_core_map[0]) == num_online_cpus())
return 0;
#endif
/* Assume multi socket systems are not synchronized */
return num_online_cpus() > 1;