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SubjectRe: [PATCH] futex: cmpxchg_futex_value_locked API change
Michel Lespinasse <> wrote:

> The cmpxchg_futex_value_locked API was funny in that it returned either
> the original, user-exposed futex value OR an error code such as -EFAULT.
> This was confusing at best, and could be a source of livelocks in places
> that retry the cmpxchg_futex_value_locked after trying to fix the issue
> by running fault_in_user_writeable().
> This change makes the cmpxchg_futex_value_locked API more similar to the
> get_futex_value_locked one, returning an error code and updating the
> original value through a reference argument.
> Signed-off-by: Michel Lespinasse <>

Acked-by: David Howells <> [FRV]

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