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

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Date:   Mon, 25 Jun 2018 20:07:17 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Mathieu Malaterre <malat@...ian.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, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/memblock: add missing include <linux/bootmem.h>

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.

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