Re: [PATCH] ext4: fix race conditions in ->d_compare() and ->d_hash()

[Gao Xiang <hsiangkao@xxxxxxx>]

On Thu, Jan 23, 2020 at 09:16:01PM -0800, Eric Biggers wrote:

[]

> So we need READ_ONCE() to ensure that a consistent value is used.

By the way, my understanding is all pointer could be accessed
atomicly guaranteed by compiler. In my opinion, we generally
use READ_ONCE() on pointers for other uses (such as, avoid
accessing a variable twice due to compiler optimization and
it will break some logic potentially or need some data
dependency barrier...)

Thanks,
Gao Xiang