Old 32-bit AMD CPUs (all w/o L3 cache) should always return 0
for cpuid_edx(0x80000006).

For unknown reason the 32-bit implementation differed from the
64-bit implementation. See commit 67cddd94 ("i386: Add L3 cache
support to AMD CPUID4 emulation"). The current check is the
result of the x86 merge.
Signed-off-by: NAndreas Herrmann <andreas.herrmann3@amd.com>
Cc: Andi Kleen <andi@firstfloor.org>
LKML-Reference: <20100902133710.GA5449@loge.amd.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>