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SubjectRe: [PATCH] RCU: Reduce size of rcu_head 1 of 2
Andrew Morton wrote:
> > Gratuitous change to API during stable series BAD BAD BAD. If
> > you drop this it stays as is until 2.8. The extra arg in
> > unneccessary, but breaking it is worse.
> There won't be any out-of-tree users by then.

I must be misunderstanding something. If the point of the patch is to
shrink "struct rcu_head" (which it seems to do) won't that change
offsets in all sorts of things like "struct dentry"? I know we
officially don't care about binary modules but a change like that
seems pretty gratuitous for such a small gain.

This sounds like the kind of change that should either happen now or
wait for 2.7.1 (and not be backported into 2.6)

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