K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2010-01-09T11:28:01.459590Z
K 7
svn:log
V 555
Set md_ldt (pointer to the LDT) after md_ldt_sd (system segment
descriptor for the LDT) is populated. md_ldt is used by context-switch
code as indicator that LDT segment register shall be loaded with
GUSERLDT segment instead of 0, so context switch at the wrong time may
cause attempt to load non-populated descriptor.

Use store with the barrier to prevent other CPUs from seeing updated
md_ldt but not seeing updated md_ldt_sd. Multithreaded process may
context-switch to another thread of the process on another CPU and read
md_ldt.

MFC after:	1 week

END