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

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Message-Id: <20180906124321.GD27492@rapoport-lnx>
Date:   Thu, 6 Sep 2018 15:43:21 +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 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.

Besides, from what I've seen, many users of memblock_phys_alloc can be
converted to the virtual variant and then we can just have memblock_alloc
everywhere in the end.

Currently there are ~70 users of memblock_virt_alloc*, but with the
bootmem -> memblock conversion we'll be adding ~140 more.

> -- 
> Michal Hocko
> SUSE Labs
> 

-- 
Sincerely yours,
Mike.