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SubjectRe: rcu_read_lock lost its compiler barrier
On Sat, Jun 1, 2019 at 10:56 PM Herbert Xu <herbert@gondor.apana.org.au> wrote:
>
> You can't then go and decide to remove the compiler barrier! To do
> that you'd need to audit every single use of rcu_read_lock in the
> kernel to ensure that they're not depending on the compiler barrier.

What's the possible case where it would matter when there is no preemption?

Linus

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