documentation: Record limitations of bitfields and small variables
This commit documents the fact that it is not safe to use bitfields
as shared variables in synchronization algorithms. It also documents
that CPUs must provide one-byte and two-byte normal load and store
instructions in order to be supported by the Linux kernel. (Michael
Cree has agreed to the resulting non-support of pre-EV56 Alpha CPUs:
https://lkml.org/lkml/2014/9/5/143.)
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
1 file changed
