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Date:   Fri, 24 Jan 2020 13:34:23 +0800
From:   Gao Xiang <>
To:     Eric Biggers <>
        Alexander Viro <>,
        Daniel Rosenberg <>,
        Gabriel Krisman Bertazi <>
Subject: Re: [PATCH] ext4: fix race conditions in ->d_compare() and ->d_hash()

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...)

Gao Xiang

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