linux-kernel - Re: [PATCH RFC] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY

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Date:   Wed, 25 Jan 2017 14:46:17 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     paulmck@...ux.vnet.ibm.com
Cc:     Christoph Lameter <cl@...ux.com>, willy@...radead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org
Subject: Re: [PATCH RFC] mm: Rename SLAB_DESTROY_BY_RCU to
 SLAB_TYPESAFE_BY_RCU

On Wed, 2017-01-25 at 12:07 -0800, Paul E. McKenney wrote:
> On Wed, Jan 25, 2017 at 09:04:47AM -0800, Eric Dumazet wrote:

> > 
> > Not clear why we need to change this very fine name ?
> > 
> > SLAB_DESTROY_BY_RCU was only used by few of us, we know damn well what
> > it means.
> > 
> > Consider we wont be able to change it in various web pages / archives /
> > changelogs.
> 
> The reason I proposed this change is that I ran into some people last
> week who had burned some months learning that this very fine flag
> provides only type safety, not identity safety.
> 
> Other proposals?

Bung hunting requires scrapping git log, in particular in areas touching
RCU (not exactly trivial stuff :) :) :) )

git log | grep SLAB_DESTROY_BY_RCU 

A Google search on SLAB_DESTROY_BY_RCU finds ~4600 results.

If we rename SLAB_DESTROY_BY_RCU by XXXXXXXX, someone trying to see
prior patches or articles about XXXXXXXX mistakes will find nothing.

So please leave comments giving the old name ( SLAB_DESTROY_BY_RCU ) and
save time for future hackers.

Thanks.