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

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

[Mathieu Malaterre]

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@intel.com>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
---
 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)
 /**
  * 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

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

[Michal Hocko]

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@intel.com>
> Signed-off-by: Mathieu Malaterre <malat@debian.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

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

[Mathieu Malaterre]

On Mon, Jun 25, 2018 at 4:03 PM Michal Hocko <mhocko@kernel.org> wrote:
>
> 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@intel.com>
> > Signed-off-by: Mathieu Malaterre <malat@debian.org>
>
> I was not aware of -Wmissing-prototypes

(not tested) sparse would report something like:

symbol 'memblock_virt_alloc_try_nid_raw' was not declared. Should it be static?

> > ---
> >  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.

Right, that can be simplified. I took it directly from Tony. I
originally found it more readable since it matched sentinels used for
the prototypes in <linux/bootmem.h>

$ grep -B 7 memblock_virt_alloc_try_nid_raw include/linux/bootmem.h | head -1
#if defined(CONFIG_HAVE_MEMBLOCK) && defined(CONFIG_NO_BOOTMEM)

I'll send a v2 shortly.

> >  /**
> >   * 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

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

[Mathieu Malaterre]

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)

Suggested-by: Tony Luck <tony.luck@intel.com>
Suggested-by: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
---
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

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

[Michal Hocko]

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@intel.com>
> Suggested-by: Michal Hocko <mhocko@kernel.org>
> Signed-off-by: Mathieu Malaterre <malat@debian.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@suse.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

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

[Mathieu Malaterre]

On Mon, Jun 25, 2018 at 8:07 PM Michal Hocko <mhocko@kernel.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@intel.com>
> > Suggested-by: Michal Hocko <mhocko@kernel.org>
> > Signed-off-by: Mathieu Malaterre <malat@debian.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@suse.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

[PATCH v3] mm/memblock: add missing include <linux/bootmem.h>

[Mathieu Malaterre]

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]

Also adds #ifdef blockers to prevent compilation failure on mips/ia64 where
CONFIG_NO_BOOTMEM=n as could be seen in commit commit 6cc22dc08a24 ("revert
"mm/memblock: add missing include <linux/bootmem.h>"").

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)

Suggested-by: Tony Luck <tony.luck@intel.com>
Suggested-by: Michal Hocko <mhocko@kernel.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Mathieu Malaterre <malat@debian.org>
---
v3: Add missing reference to commit 6cc22dc08a24
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

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

[Mike Rapoport]

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@intel.com>
> > Suggested-by: Michal Hocko <mhocko@kernel.org>
> > Signed-off-by: Mathieu Malaterre <malat@debian.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@suse.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.

Re: [PATCH v3] mm/memblock: add missing include <linux/bootmem.h>

[Tony Luck]

On Tue, Jun 26, 2018 at 11:44 AM, Mathieu Malaterre <malat@debian.org> wrote:
> 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)

Is this sitting in a queue somewhere ready to go to Linus?

I don't see it upstream yet.

>
> Suggested-by: Tony Luck <tony.luck@intel.com>
> Suggested-by: Michal Hocko <mhocko@kernel.org>
> Acked-by: Michal Hocko <mhocko@suse.com>
> Signed-off-by: Mathieu Malaterre <malat@debian.org>
> ---
> v3: Add missing reference to commit 6cc22dc08a24
> 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
>

Re: [PATCH v3] mm/memblock: add missing include <linux/bootmem.h>

[Andrew Morton]

On Fri, 20 Jul 2018 12:16:05 -0700 Tony Luck <tony.luck@gmail.com> wrote:

> On Tue, Jun 26, 2018 at 11:44 AM, Mathieu Malaterre <malat@debian.org> wrote:
> > 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)
> 
> Is this sitting in a queue somewhere ready to go to Linus?

linux-next ;)

> I don't see it upstream yet.

For some brainfarty reason I had it for 4.19-rc1.  Shall send it in
today.