Another thing I've noticed are _thousands_ of these warnings:
objtool: kernel/sched/core.o: preempt_schedule_irq()+0x20: function has
unreachable instruction
objtool: kernel/sched/core.o: preempt_schedule_irq()+0x27: function has
unreachable instruction
objtool: kernel/sched/core.o: preempt_schedule_irq()+0x2c: function has
unreachable instruction
objtool: kernel/sched/core.o: preempt_schedule_irq()+0x33: function has
unreachable instruction
objtool: net/ceph/pagevec.o: ceph_put_page_vector()+0x171: function has
unreachable instruction
objtool: net/ceph/pagevec.o: ceph_put_page_vector()+0x178: function has
unreachable instruction
objtool: net/ceph/pagevec.o: ceph_put_page_vector()+0x17d: function has
unreachable instruction
objtool: net/ceph/pagevec.o: ceph_put_page_vector()+0x184: function has
unreachable instruction
objtool: net/ceph/pagevec.o: ceph_get_direct_page_vector()+0xe2: function has
unreachable instruction
objtool: net/ceph/pagevec.o: ceph_get_direct_page_vector()+0xe9: function has
unreachable instruction
objtool: net/ceph/pagevec.o: ceph_get_direct_page_vector()+0xee: function has
unreachable instruction
objtool: net/ceph/pagevec.o: ceph_get_direct_page_vector()+0xf5: function has
unreachable instruction
objtool: net/ceph/pagevec.o: zero_user_segment()+0x120: function has
unreachable instruction
objtool: net/ceph/pagevec.o: zero_user_segment()+0x127: function has
unreachable instruction
objtool: net/ceph/pagevec.o: zero_user_segment()+0x12c: function has
unreachable instruction
objtool: net/ceph/pagevec.o: zero_user_segment()+0x133: function has
unreachable instruction
that's on an x86-64 allyesconfig kernel, with objtool merged to tip:master,
using
GCC 4.9.2:
gcc version 4.9.2 20150212 (Red Hat 4.9.2-6) (GCC)
Also, please prefix such warnings with the standard compiler prefix, something
like this:
kernel/sched/core.c: warning: objtool: preempt_schedule_irq()+0x20:
function has unreachable instruction
so that scripts/tools monitoring new build warnings can pick them up
automatically?
Thanks,
Ingo
