linux-kernel - Re: [PATCH v2] mm/memblock: add missing include <linux/bootmem.h>

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Date:   Wed, 27 Jun 2018 13:05:08 +0300
From:   Mike Rapoport <rppt@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Mathieu Malaterre <malat@...ian.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tony Luck <tony.luck@...el.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Steven Sistare <steven.sistare@...cle.com>,
        Daniel Vacek <neelx@...hat.com>,
        Stefan Agner <stefan@...er.ch>, Joe Perches <joe@...ches.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/memblock: add missing include <linux/bootmem.h>

On Mon, Jun 25, 2018 at 08:07:17PM +0200, Michal Hocko wrote:
> On Mon 25-06-18 19:15:12, Mathieu Malaterre wrote:
> > Commit 26f09e9b3a06 ("mm/memblock: add memblock memory allocation apis")
> > introduced two new function definitions:
> > 
> >   memblock_virt_alloc_try_nid_nopanic()
> >   memblock_virt_alloc_try_nid()
> > 
> > Commit ea1f5f3712af ("mm: define memblock_virt_alloc_try_nid_raw")
> > introduced the following function definition:
> > 
> >   memblock_virt_alloc_try_nid_raw()
> > 
> > This commit adds an include of header file <linux/bootmem.h> to provide
> > the missing function prototypes. Silence the following gcc warning
> > (W=1):
> > 
> >   mm/memblock.c:1334:15: warning: no previous prototype for `memblock_virt_alloc_try_nid_raw' [-Wmissing-prototypes]
> >   mm/memblock.c:1371:15: warning: no previous prototype for `memblock_virt_alloc_try_nid_nopanic' [-Wmissing-prototypes]
> >   mm/memblock.c:1407:15: warning: no previous prototype for `memblock_virt_alloc_try_nid' [-Wmissing-prototypes]
> > 
> > It also adds #ifdef blockers to prevent compilation failure on mips/ia64
> > where CONFIG_NO_BOOTMEM=n. Because Makefile already does:
> > 
> >   obj-$(CONFIG_HAVE_MEMBLOCK) += memblock.o
> > 
> > The #ifdef has been simplified from:
> > 
> >   #if defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM)
> > 
> > to simply:
> > 
> >   #if defined(CONFIG_NO_BOOTMEM)
> 
> Well, I would apreciate an explanation why do we need NO_BOOTMEM guard
> in the first place rather than why HAVE_MEMBLOCK is not needed.
> 
> > Suggested-by: Tony Luck <tony.luck@...el.com>
> > Suggested-by: Michal Hocko <mhocko@...nel.org>
> > Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> 
> Anyway this looks better. I wish we can actually get rid of bootmem
> allocator which would simplify this as well but that is another topic.

There only 5 arches with bootmem left :)

I've started looking into it, but it goes slow :(
 
> Acked-by: Michal Hocko <mhocko@...e.com>
> 
> > ---
> > v2: Simplify #ifdef
> > 
> >  mm/memblock.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/mm/memblock.c b/mm/memblock.c
> > index 03d48d8835ba..611a970ac902 100644
> > --- a/mm/memblock.c
> > +++ b/mm/memblock.c
> > @@ -20,6 +20,7 @@
> >  #include <linux/kmemleak.h>
> >  #include <linux/seq_file.h>
> >  #include <linux/memblock.h>
> > +#include <linux/bootmem.h>
> >  
> >  #include <asm/sections.h>
> >  #include <linux/io.h>
> > @@ -1224,6 +1225,7 @@ phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, i
> >  	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
> >  }
> >  
> > +#if defined(CONFIG_NO_BOOTMEM)
> >  /**
> >   * memblock_virt_alloc_internal - allocate boot memory block
> >   * @size: size of memory block to be allocated in bytes
> > @@ -1431,6 +1433,7 @@ void * __init memblock_virt_alloc_try_nid(
> >  	      (u64)max_addr);
> >  	return NULL;
> >  }
> > +#endif
> >  
> >  /**
> >   * __memblock_free_early - free boot memory block
> > -- 
> > 2.11.0
> > 
> 
> -- 
> Michal Hocko
> SUSE Labs
> 

-- 
Sincerely yours,
Mike.