linux-kernel - Re: [RFC PATCH 07/29] memblock: remove _virt from APIs returning virtual address

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Message-Id: <20180907091922.GB19153@rapoport-lnx>
Date:   Fri, 7 Sep 2018 12:19:22 +0300
From:   Mike Rapoport <rppt@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Rob Herring <robh@...nel.org>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>, davem@...emloft.net,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        mingo@...hat.com, Michael Ellerman <mpe@...erman.id.au>,
        paul.burton@...s.com, Thomas Gleixner <tglx@...utronix.de>,
        tony.luck@...el.com, linux-ia64@...r.kernel.org,
        linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
        sparclinux@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 07/29] memblock: remove _virt from APIs returning
 virtual address

On Fri, Sep 07, 2018 at 10:47:56AM +0200, Michal Hocko wrote:
> On Fri 07-09-18 11:42:12, Mike Rapoport wrote:
> > On Thu, Sep 06, 2018 at 03:46:27PM +0200, Michal Hocko wrote:
> > > On Thu 06-09-18 16:39:58, Mike Rapoport wrote:
> > > > On Thu, Sep 06, 2018 at 03:01:02PM +0200, Michal Hocko wrote:
> > > > > On Thu 06-09-18 15:43:21, Mike Rapoport wrote:
> > > > > > On Thu, Sep 06, 2018 at 09:28:00AM +0200, Michal Hocko wrote:
> > > > > > > On Wed 05-09-18 20:20:18, Mike Rapoport wrote:
> > > > > > > > On Wed, Sep 05, 2018 at 12:04:36PM -0500, Rob Herring wrote:
> > > > > > > > > On Wed, Sep 5, 2018 at 11:00 AM Mike Rapoport <rppt@...ux.vnet.ibm.com> wrote:
> > > > > > > > > >
> > > > > > > > > > The conversion is done using
> > > > > > > > > >
> > > > > > > > > > sed -i 's@...block_virt_alloc@...block_alloc@g' \
> > > > > > > > > >         $(git grep -l memblock_virt_alloc)
> > > > > > > > > 
> > > > > > > > > What's the reason to do this? It seems like a lot of churn even if a
> > > > > > > > > mechanical change.
> > > > > > > > 
> > > > > > > > I felt that memblock_virt_alloc_ is too long for a prefix, e.g:
> > > > > > > > memblock_virt_alloc_node_nopanic, memblock_virt_alloc_low_nopanic.
> > > > > > > > 
> > > > > > > > And for consistency I've changed the memblock_virt_alloc as well.
> > > > > > > 
> > > > > > > I would keep the current API unless the name is terribly misleading or
> > > > > > > it can be improved a lot. Neither seems to be the case here. So I would
> > > > > > > rather stick with the status quo.
> > > > > > 
> > > > > > I'm ok with the memblock_virt_alloc by itself, but having 'virt' in
> > > > > > 'memblock_virt_alloc_try_nid_nopanic' and 'memblock_virt_alloc_low_nopanic'
> > > > > > reduces code readability in my opinion.
> > > > > 
> > > > > Well, is _nopanic really really useful in the name. Do we even need/want
> > > > > implicit panic/nopanic semantic? The code should rather check for the
> > > > > return value and decide depending on the code path. I suspect removing
> > > > > panic/nopanic would make the API slightly lighter.
> > > >  
> > > > I agree that panic/nopanic should be removed. But I prefer to start with
> > > > equivalent replacement to make it as automated as possible and update
> > > > memblock API when the dust settles a bit.
> > > 
> > > Yes, I agree with that approach. But that also doesn't justify the
> > > renaming
> > 
> > Well, the renaming is automated :)
> 
> Yes, it is. It also adds churn to the code so I tend to prefer an
> existing naming unless it is completely misleading or incomprehensible.
> 
> Is this something to lose sleep over. Absolutely not! Does it make sense
> to discuss further? I do not think so. If you strongly believe that the
> renaming is a good thing then just do it.

I won't lose my sleep over it, but I do believe that renaming is a good thing. 
I think that in the end we'll be able to reduce the memblock allocation API
to a handful of memblock_alloc_ variants instead of ~20 we have now.

> -- 
> Michal Hocko
> SUSE Labs
> 

-- 
Sincerely yours,
Mike.