On Thu, Jun 27, 2019 at 11:33 PM Doug Berger <open...@gmail.com> wrote:
> A timing hazard exists when an early fork/exec thread begins > exiting and sets its mm pointer to NULL while a separate core > tries to update the section information. > > This commit ensures that the mm pointer is not NULL before > setting its section parameters. The arguments provided by > commit 11ce4b33aedc ("ARM: 8672/1: mm: remove tasklist locking > from update_sections_early()") are equally valid for not > requiring grabbing the task_lock around this check. > > Fixes: 08925c2f124f ("ARM: 8464/1: Update all mm structures with section > adjustments") > Signed-off-by: Doug Berger <open...@gmail.com> Cc: sta...@vger.kernel.org ? I'm not smart enough to say whether it is the right solution, but I also want to test this on some boards I have. I suspect this may be part of the problem I have with mounting root on a USB stick on some early mpcore machines, so I might come back with a Tested-by. Yours, Linus Walleij