remove unneeded includes in sys/kern
ok mpi@ miod@

If you use sys/param.h, you don't need sys/types.h

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

add back inverted poison patterns. keep high bits, but twiddle low bits.

The last poison change is awesome, it is triggering use after free bugs.
Some of them aren't too difficult to find and fix, but others are turning
out to be deeply hidden. The timing is poor -- disa

The last poison change is awesome, it is triggering use after free bugs.
Some of them aren't too difficult to find and fix, but others are turning
out to be deeply hidden. The timing is poor -- disable this for now.
We need to revisit this right after tree unlock.

show more ...

also use inverted poison patterns, to mix things up. ok deraadt miod

Repair compilability after the recent uvmexp changes, especially for
not compile-time-known page size platforms.

decouple struct uvmexp into a new file, so that uvm_extern.h and sysctl.h
don't need to be married.
ok guenther miod beck jsing kettenis

consistent use of uint32_t for poison values

Return the poison value in poison_check() and not the modified value.

ok tedu@

unfortunately the sparc pagesize handling also requires uvm_extern.h

tiny change to support two poison values based on page addr

according to pedro, ids work better with the ending $

i missed this file too.

separate memory poisoning code to a new file and make it usable kernel wide
ok deraadt