Arjan van de Ven wrote:
> Pavel Emelianov wrote:
>> I've already caught a fake warning when trying to write-lock
>> an mm->mmap_sem with another mm's mmap_sem write-locked. With the
>> patch attached everything works, fine.
>>
> btw why is that a fake warning? what is your guarantee that you never
> ever do it in the opposite direction from the other thread as well?
>
down_write(&mm->mmap_sem);
if (down_write_trylock(&another_mm->mmap_sem)) {
...
up_write(...);
}
up_write(&mm->mmap_sem);
will never deadlock as if I have another thread is doing
down_write(&another_mm->mmap_sem);
if (down_write_trylock(&mm->mmap_sem)) {
...
up_write(...);
}
up_write(&another_mm->mmap_sem);
booth will fail to trylock and go on.
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