x86/speculation/l1tf: Document l1tf in sysfs
The vulnerabilties/l1tf attribute was added by commit
17dbca119312
"x86/speculation/l1tf: Add sysfs reporting for l1tf", which has
already been backported to 3.16, but only documented in commit
d90a7a0ec83f "x86/bugs, kvm: Introduce boot-time control of L1TF
mitigations", which has not and probbaly won't be.
Add just that line of documentation for now.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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