• Haggai Eran's avatar
    mm: wrap calls to set_pte_at_notify with invalidate_range_start and invalidate_range_end · 6bdb913f
    Haggai Eran authored
    In order to allow sleeping during invalidate_page mmu notifier calls, we
    need to avoid calling when holding the PT lock.  In addition to its direct
    calls, invalidate_page can also be called as a substitute for a change_pte
    call, in case the notifier client hasn't implemented change_pte.
    
    This patch drops the invalidate_page call from change_pte, and instead
    wraps all calls to change_pte with invalidate_range_start and
    invalidate_range_end calls.
    
    Note that change_pte still cannot sleep after this patch, and that clients
    implementing change_pte should not take action on it in case the number of
    outstanding invalidate_range_start calls is larger than one, otherwise
    they might miss a later invalidation.
    Signed-off-by: default avatarHaggai Eran <haggaie@mellanox.com>
    Cc: Andrea Arcangeli <andrea@qumranet.com>
    Cc: Sagi Grimberg <sagig@mellanox.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
    Cc: Or Gerlitz <ogerlitz@mellanox.com>
    Cc: Haggai Eran <haggaie@mellanox.com>
    Cc: Shachar Raindel <raindel@mellanox.com>
    Cc: Liran Liss <liranl@mellanox.com>
    Cc: Christoph Lameter <cl@linux-foundation.org>
    Cc: Avi Kivity <avi@redhat.com>
    Cc: Hugh Dickins <hughd@google.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    6bdb913f
uprobes.c 39.1 KB