• Hugh Dickins's avatar
    memcg: fix mem_cgroup_print_bad_page · 90b3feae
    Hugh Dickins authored
    If DEBUG_VM, mem_cgroup_print_bad_page() is called whenever bad_page()
    shows a "Bad page state" message, removes page from circulation, adds a
    taint and continues.  This is at a very low level, often when a spinlock
    is held (sometimes when page table lock is held, for example).
    
    We want to recover from this badness, not make it worse: we must not
    kmalloc memory here, we must not do a cgroup path lookup via dubious
    pointers.  No doubt that code was useful to debug a particular case at one
    time, and may be again, but take it out of the mainline kernel.
    Signed-off-by: default avatarHugh Dickins <hughd@google.com>
    Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
    Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Michal Hocko <mhocko@suse.cz>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    90b3feae
memcontrol.c 142 KB