linux-kernel - Re: [RFC PATCH 14/29] memblock: add align parameter to memblock_alloc

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Message-Id: <20180906124944.GF27492@rapoport-lnx>
Date:   Thu, 6 Sep 2018 15:49:44 +0300
From:   Mike Rapoport <rppt@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Burton <paul.burton@...s.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tony Luck <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@...r.kernel.org
Subject: Re: [RFC PATCH 14/29] memblock: add align parameter to
 memblock_alloc_node()

On Thu, Sep 06, 2018 at 10:06:14AM +0200, Michal Hocko wrote:
> On Wed 05-09-18 18:59:29, Mike Rapoport wrote:
> > With the align parameter memblock_alloc_node() can be used as drop in
> > replacement for alloc_bootmem_pages_node().
> 
> Why do we need an additional translation later? Sparse code which is the
> only one to use it already uses memblock_alloc_try_nid elsewhere
> (sparse_mem_map_populate).

It is also used in later patches to replace alloc_bootmem* in several
places and most of them explicitly set the alignment.
 
> > Signed-off-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
> > ---
> >  include/linux/bootmem.h | 4 ++--
> >  mm/sparse.c             | 2 +-
> >  2 files changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
> > index 7d91f0f..3896af2 100644
> > --- a/include/linux/bootmem.h
> > +++ b/include/linux/bootmem.h
> > @@ -157,9 +157,9 @@ static inline void * __init memblock_alloc_from_nopanic(
> >  }
> >  
> >  static inline void * __init memblock_alloc_node(
> > -						phys_addr_t size, int nid)
> > +		phys_addr_t size, phys_addr_t align, int nid)
> >  {
> > -	return memblock_alloc_try_nid(size, 0, BOOTMEM_LOW_LIMIT,
> > +	return memblock_alloc_try_nid(size, align, BOOTMEM_LOW_LIMIT,
> >  					    BOOTMEM_ALLOC_ACCESSIBLE, nid);
> >  }
> >  
> > diff --git a/mm/sparse.c b/mm/sparse.c
> > index 04e97af..509828f 100644
> > --- a/mm/sparse.c
> > +++ b/mm/sparse.c
> > @@ -68,7 +68,7 @@ static noinline struct mem_section __ref *sparse_index_alloc(int nid)
> >  	if (slab_is_available())
> >  		section = kzalloc_node(array_size, GFP_KERNEL, nid);
> >  	else
> > -		section = memblock_alloc_node(array_size, nid);
> > +		section = memblock_alloc_node(array_size, 0, nid);
> >  
> >  	return section;
> >  }
> > -- 
> > 2.7.4
> > 
> 
> -- 
> Michal Hocko
> SUSE Labs
> 

-- 
Sincerely yours,
Mike.