11 fixes, based on 4340fa55298d17049e71c7a34e04647379c269f3:

Subject: mm: fix overflow in vm_map_ram()
Subject: kdump: fix dmesg gdbmacro to work with record based printk
Subject: mm: check the return value of lookup_page_ext for all call sites
Subject: reiserfs: avoid uninitialized variable use
Subject: memcg: add RCU locking around css_for_each_descendant_pre() in memcg_offline_kmem()
Subject: mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
Subject: checkpatch: reduce git commit description style false positives
Subject: mm, page_alloc: prevent infinite loop in buffered_rmqueue()
Subject: mm, oom_reaper: do not use siglock in try_oom_reaper()
Subject: mm, page_alloc: reset zonelist iterator after resetting fair zone allocation policy
Subject: mm, page_alloc: recalculate the preferred zoneref if the context can ignore memory policies