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

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Date:   Mon, 25 Jun 2018 16:03:46 +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] mm/memblock: add missing include <linux/bootmem.h> and
 #ifdef

On Fri 22-06-18 23:05:41, 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]
> 
> As seen in commit 6cc22dc08a24 ("revert "mm/memblock: add missing include
> <linux/bootmem.h>"") #ifdef blockers were missing which lead to compilation
> failure on mips/ia64 where CONFIG_NO_BOOTMEM=n.
> 
> Suggested-by: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>

I was not aware of -Wmissing-prototypes

> ---
>  mm/memblock.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 4c98672bc3e2..f4b6766d7907 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>
> @@ -1226,6 +1227,7 @@ 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_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM)

Why do you need CONFIG_HAVE_MEMBLOCK dependency?
mm/Makefile says
obj-$(CONFIG_HAVE_MEMBLOCK) += memblock.o

so we even do not compile this code for !HAVE_MEMBLOCK AFAICS.

>  /**
>   * memblock_virt_alloc_internal - allocate boot memory block
>   * @size: size of memory block to be allocated in bytes
> @@ -1433,6 +1435,7 @@ 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