tree bab2cb6560f2e038ccebf891cd847f37fd61a1b8
parent 0cd5c3c80a0ebd68c08312fa7d8c13149cc61c4c
author Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com> 1233967925 -0800
committer Ingo Molnar <mingo@elte.hu> 1234174515 +0100

x86: add clflush before monitor for Intel 7400 series

For Intel 7400 series CPUs, the recommendation is to use a clflush on the
monitored address just before monitor and mwait pair [1].

This clflush makes sure that there are no false wakeups from mwait when the
monitored address was recently written to.

[1] "MONITOR/MWAIT Recommendations for Intel Xeon Processor 7400 series"
    section in specification update document of 7400 series
    http://download.intel.com/design/xeon/specupdt/32033601.pdf

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>