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

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Date:   Tue, 26 Jun 2018 08:14:13 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     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, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mm/memblock: add missing include <linux/bootmem.h>

On Mon, Jun 25, 2018 at 8:07 PM Michal Hocko <mhocko@...nel.org> 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.

Right, I am missing the explicit reference to commit 6cc22dc08a247b
("revert "mm/memblock: add missing include <linux/bootmem.h>""), I can
tweak the commit message in a v3.

> > 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.
>
> Acked-by: Michal Hocko <mhocko@...e.com>

Thanks !

> > ---
> > 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