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In the page fault case it is ok to see if a few more unaligned bytes
can be copied from the source address. Worst case is that the page fault
will be triggered again.
Machine checks are more serious. Just give up at the point where the
main copy loop triggered the #MC and return from the copy code as if
the copy succeeded. The machine check handler will use task_work_add() to
make sure that the task is sent a SIGBUS.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201006210910.21062-5-tony.luck@intel.com
a2f73400e4