Documents how to use the PR_PPC_GET_DEXCR and PR_PPC_SET_DEXCR prctl()'s
for changing a process's DEXCR or its process tree default value.
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240417112325.728010-10-bgray@linux.ibm.com