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lookup_hash() and lookup_one_len()

Hello,

What is the difference between lookup_hash() and lookup_one_len()?
Can I use them for the same purpose?

I was using lookup_hash(), but since kernel 2.6.15 changed
the parameters for lookup_hash(), I want to know whether
I can replace lookup_hash() with lookup_one_len() to avoid
"#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)" conditional code.
I found that using lookup_one_len() makes my code smaller
than lookup_hash(), but I'm worried that behavior might change.

Regards.

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