linux-kernel - Re: [PATCH v2 6/6] arm, unicore32: remove early

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Date:   Mon, 3 Dec 2018 18:55:04 +0200
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        davem@...emloft.net, gxt@....edu.cn,
        Greentime Hu <green.hu@...il.com>, jonas@...thpole.se,
        Michael Ellerman <mpe@...erman.id.au>, mhocko@...e.com,
        Michal Simek <monstr@...str.eu>, msalter@...hat.com,
        Paul Mackerras <paulus@...ba.org>, dalias@...c.org,
        linux@...linux.org.uk, stefan.kristiansson@...nalahti.fi,
        shorne@...il.com, deanbo422@...il.com, ysato@...rs.sourceforge.jp,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-c6x-dev@...ux-c6x.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm@...ck.org, linux-sh@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, openrisc@...ts.librecores.org,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH v2 6/6] arm, unicore32: remove early_alloc*() wrappers

On Mon, Dec 03, 2018 at 10:27:02AM -0600, Rob Herring wrote:
> On Mon, Dec 3, 2018 at 9:48 AM Mike Rapoport <rppt@...ux.ibm.com> wrote:
> >
> > On arm and unicore32i the early_alloc_aligned() and and early_alloc() are
> > oneliner wrappers for memblock_alloc.
> >
> > Replace their usage with direct call to memblock_alloc.
> >
> > Suggested-by: Christoph Hellwig <hch@...radead.org>
> > Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> > ---
> >  arch/arm/mm/mmu.c       | 11 +++--------
> >  arch/unicore32/mm/mmu.c | 12 ++++--------
> >  2 files changed, 7 insertions(+), 16 deletions(-)
> >
> > diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
> > index 0a04c9a5..57de0dd 100644
> > --- a/arch/arm/mm/mmu.c
> > +++ b/arch/arm/mm/mmu.c
> > @@ -719,14 +719,9 @@ EXPORT_SYMBOL(phys_mem_access_prot);
> >
> >  #define vectors_base() (vectors_high() ? 0xffff0000 : 0)
> >
> > -static void __init *early_alloc_aligned(unsigned long sz, unsigned long align)
> > -{
> > -       return memblock_alloc(sz, align);
> > -}
> > -
> >  static void __init *early_alloc(unsigned long sz)
> 
> Why not get rid of this wrapper like you do on unicore?

ARM has early_alloc() and late_alloc() callbacks which in the end are
passed as a parameter to alloc_init_pXd() functions. 

Removing early_alloc() would require refactoring all the page table
allocation code.
 
> >  {
> > -       return early_alloc_aligned(sz, sz);
> > +       return memblock_alloc(sz, sz);
> >  }
> 

-- 
Sincerely yours,
Mike.