tree bae1a90cc162a0d5bd1a78290ffb1f445fc07d80
parent 434b3d3209a8d8dcda63c3b14815659f4671b0a8
author Ingo Molnar <mingo@elte.hu> 1194457068 +0100
committer Thomas Gleixner <tglx@apollo.(none)> 1195313220 +0100

x86: ignore the sys_getcpu() tcache parameter

dont use the vgetcpu tcache - it's causing problems with tasks
migrating, they'll see the old cache up to a jiffy after the
migration, further increasing the costs of the migration.

In the worst case they see a complete bogus information from
the tcache, when a sys_getcpu() call "invalidated" the cache
info by incrementing the jiffies _and_ the cpuid info in the
cache and the following vdso_getcpu() call happens after
vdso_jiffies have been incremented.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>