Frederic Barrat <fbar...@linux.ibm.com> writes: > With the optimizations for TLB invalidation from commit 0cef77c7798a > ("powerpc/64s/radix: flush remote CPUs out of single-threaded > mm_cpumask"), the scope of a TLBI (global vs. local) can now be > influenced by the value of the 'copros' counter of the memory context. > > When calling mm_context_remove_copro(), the 'copros' counter is > decremented first before flushing. It may have the unintended side > effect of sending local TLBIs when we explicitly need global > invalidations in this case. Thus breaking any nMMU user in a bad and > unpredictable way. > > Fix it by flushing first, before updating the 'copros' counter, so > that invalidations will be global. > > Fixes: 0cef77c7798a ("powerpc/64s/radix: flush remote CPUs out of > single-threaded mm_cpumask") > Signed-off-by: Frederic Barrat <fbar...@linux.ibm.com> > --- Tested-by: Vaibhav Jain <vaib...@linux.ibm.com>
-- Vaibhav Jain <vaib...@linux.vnet.ibm.com> Linux Technology Center, IBM India Pvt. Ltd.