Pavel Emelianov wrote:
This causes constructions like
down_write(&mm1->mmap_sem);
if (down_write_trylock(&mm2->mmap_sem)) {
...
up_write(&mm2->mmap_sem);
}
up_write(&mm1->mmap_sem);
generate a lockdep warning about circular locking dependence.
please show me why this is safe, especially if you intermix it with
down_read()'s... like copy_to_user and co may do.
this feels like a very unsafe construct to me...
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