[PATCH] mm: Move p?d_alloc_track to separate header file

[PATCH] mm: Move p?d_alloc_track to separate header file

[Joerg Roedel]

From: Joerg Roedel <jroedel@suse.de>

The functions are only used in two source files, so there is no need
for them to be in the global <linux/mm.h> header. Move them to the new
<linux/pgalloc-track.h> header and include it only where needed.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 include/linux/mm.h            | 45 -------------------------------
 include/linux/pgalloc-track.h | 51 +++++++++++++++++++++++++++++++++++
 lib/ioremap.c                 |  1 +
 mm/vmalloc.c                  |  1 +
 4 files changed, 53 insertions(+), 45 deletions(-)
 create mode 100644 include/linux/pgalloc-track.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9d6042178ca7..22d8b2a2c9bc 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2092,51 +2092,11 @@ static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d,
 		NULL : pud_offset(p4d, address);
 }
 
-static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
-				     unsigned long address,
-				     pgtbl_mod_mask *mod_mask)
-
-{
-	if (unlikely(pgd_none(*pgd))) {
-		if (__p4d_alloc(mm, pgd, address))
-			return NULL;
-		*mod_mask |= PGTBL_PGD_MODIFIED;
-	}
-
-	return p4d_offset(pgd, address);
-}
-
-static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
-				     unsigned long address,
-				     pgtbl_mod_mask *mod_mask)
-{
-	if (unlikely(p4d_none(*p4d))) {
-		if (__pud_alloc(mm, p4d, address))
-			return NULL;
-		*mod_mask |= PGTBL_P4D_MODIFIED;
-	}
-
-	return pud_offset(p4d, address);
-}
-
 static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
 {
 	return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
 		NULL: pmd_offset(pud, address);
 }
-
-static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
-				     unsigned long address,
-				     pgtbl_mod_mask *mod_mask)
-{
-	if (unlikely(pud_none(*pud))) {
-		if (__pmd_alloc(mm, pud, address))
-			return NULL;
-		*mod_mask |= PGTBL_PUD_MODIFIED;
-	}
-
-	return pmd_offset(pud, address);
-}
 #endif /* CONFIG_MMU */
 
 #if USE_SPLIT_PTE_PTLOCKS
@@ -2252,11 +2212,6 @@ static inline void pgtable_pte_page_dtor(struct page *page)
 	((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \
 		NULL: pte_offset_kernel(pmd, address))
 
-#define pte_alloc_kernel_track(pmd, address, mask)			\
-	((unlikely(pmd_none(*(pmd))) &&					\
-	  (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
-		NULL: pte_offset_kernel(pmd, address))
-
 #if USE_SPLIT_PMD_PTLOCKS
 
 static struct page *pmd_to_page(pmd_t *pmd)
diff --git a/include/linux/pgalloc-track.h b/include/linux/pgalloc-track.h
new file mode 100644
index 000000000000..1dcc865029a2
--- /dev/null
+++ b/include/linux/pgalloc-track.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_PGALLLC_TRACK_H
+#define _LINUX_PGALLLC_TRACK_H
+
+#if defined(CONFIG_MMU)
+static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
+				     unsigned long address,
+				     pgtbl_mod_mask *mod_mask)
+{
+	if (unlikely(pgd_none(*pgd))) {
+		if (__p4d_alloc(mm, pgd, address))
+			return NULL;
+		*mod_mask |= PGTBL_PGD_MODIFIED;
+	}
+
+	return p4d_offset(pgd, address);
+}
+
+static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
+				     unsigned long address,
+				     pgtbl_mod_mask *mod_mask)
+{
+	if (unlikely(p4d_none(*p4d))) {
+		if (__pud_alloc(mm, p4d, address))
+			return NULL;
+		*mod_mask |= PGTBL_P4D_MODIFIED;
+	}
+
+	return pud_offset(p4d, address);
+}
+
+static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
+				     unsigned long address,
+				     pgtbl_mod_mask *mod_mask)
+{
+	if (unlikely(pud_none(*pud))) {
+		if (__pmd_alloc(mm, pud, address))
+			return NULL;
+		*mod_mask |= PGTBL_PUD_MODIFIED;
+	}
+
+	return pmd_offset(pud, address);
+}
+#endif /* CONFIG_MMU */
+
+#define pte_alloc_kernel_track(pmd, address, mask)			\
+	((unlikely(pmd_none(*(pmd))) &&					\
+	  (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
+		NULL: pte_offset_kernel(pmd, address))
+
+#endif /* _LINUX_PGALLLC_TRACK_H */
diff --git a/lib/ioremap.c b/lib/ioremap.c
index ad485f08173b..608fcccd21c8 100644
--- a/lib/ioremap.c
+++ b/lib/ioremap.c
@@ -11,6 +11,7 @@
 #include <linux/sched.h>
 #include <linux/io.h>
 #include <linux/export.h>
+#include <linux/pgalloc-track.h>
 #include <asm/cacheflush.h>
 #include <asm/pgtable.h>
 
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3091c2ca60df..edc43f003165 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -35,6 +35,7 @@
 #include <linux/bitops.h>
 #include <linux/rbtree_augmented.h>
 #include <linux/overflow.h>
+#include <linux/pgalloc-track.h>
 
 #include <linux/uaccess.h>
 #include <asm/tlbflush.h>
-- 
2.26.2

Re: [PATCH] mm: Move p?d_alloc_track to separate header file

[Mike Rapoport]

On Tue, Jun 09, 2020 at 02:05:33PM +0200, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@suse.de>
> 
> The functions are only used in two source files, so there is no need
> for them to be in the global <linux/mm.h> header. Move them to the new
> <linux/pgalloc-track.h> header and include it only where needed.
> 
> Signed-off-by: Joerg Roedel <jroedel@suse.de>

Acked-by: Mike Rapoport <rppt@linux.ibm.com>

> ---
>  include/linux/mm.h            | 45 -------------------------------
>  include/linux/pgalloc-track.h | 51 +++++++++++++++++++++++++++++++++++
>  lib/ioremap.c                 |  1 +
>  mm/vmalloc.c                  |  1 +
>  4 files changed, 53 insertions(+), 45 deletions(-)
>  create mode 100644 include/linux/pgalloc-track.h
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 9d6042178ca7..22d8b2a2c9bc 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2092,51 +2092,11 @@ static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d,
>  		NULL : pud_offset(p4d, address);
>  }
>  
> -static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
> -				     unsigned long address,
> -				     pgtbl_mod_mask *mod_mask)
> -
> -{
> -	if (unlikely(pgd_none(*pgd))) {
> -		if (__p4d_alloc(mm, pgd, address))
> -			return NULL;
> -		*mod_mask |= PGTBL_PGD_MODIFIED;
> -	}
> -
> -	return p4d_offset(pgd, address);
> -}
> -
> -static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
> -				     unsigned long address,
> -				     pgtbl_mod_mask *mod_mask)
> -{
> -	if (unlikely(p4d_none(*p4d))) {
> -		if (__pud_alloc(mm, p4d, address))
> -			return NULL;
> -		*mod_mask |= PGTBL_P4D_MODIFIED;
> -	}
> -
> -	return pud_offset(p4d, address);
> -}
> -
>  static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
>  {
>  	return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
>  		NULL: pmd_offset(pud, address);
>  }
> -
> -static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
> -				     unsigned long address,
> -				     pgtbl_mod_mask *mod_mask)
> -{
> -	if (unlikely(pud_none(*pud))) {
> -		if (__pmd_alloc(mm, pud, address))
> -			return NULL;
> -		*mod_mask |= PGTBL_PUD_MODIFIED;
> -	}
> -
> -	return pmd_offset(pud, address);
> -}
>  #endif /* CONFIG_MMU */
>  
>  #if USE_SPLIT_PTE_PTLOCKS
> @@ -2252,11 +2212,6 @@ static inline void pgtable_pte_page_dtor(struct page *page)
>  	((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \
>  		NULL: pte_offset_kernel(pmd, address))
>  
> -#define pte_alloc_kernel_track(pmd, address, mask)			\
> -	((unlikely(pmd_none(*(pmd))) &&					\
> -	  (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
> -		NULL: pte_offset_kernel(pmd, address))
> -
>  #if USE_SPLIT_PMD_PTLOCKS
>  
>  static struct page *pmd_to_page(pmd_t *pmd)
> diff --git a/include/linux/pgalloc-track.h b/include/linux/pgalloc-track.h
> new file mode 100644
> index 000000000000..1dcc865029a2
> --- /dev/null
> +++ b/include/linux/pgalloc-track.h
> @@ -0,0 +1,51 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_PGALLLC_TRACK_H
> +#define _LINUX_PGALLLC_TRACK_H
> +
> +#if defined(CONFIG_MMU)
> +static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
> +				     unsigned long address,
> +				     pgtbl_mod_mask *mod_mask)
> +{
> +	if (unlikely(pgd_none(*pgd))) {
> +		if (__p4d_alloc(mm, pgd, address))
> +			return NULL;
> +		*mod_mask |= PGTBL_PGD_MODIFIED;
> +	}
> +
> +	return p4d_offset(pgd, address);
> +}
> +
> +static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
> +				     unsigned long address,
> +				     pgtbl_mod_mask *mod_mask)
> +{
> +	if (unlikely(p4d_none(*p4d))) {
> +		if (__pud_alloc(mm, p4d, address))
> +			return NULL;
> +		*mod_mask |= PGTBL_P4D_MODIFIED;
> +	}
> +
> +	return pud_offset(p4d, address);
> +}
> +
> +static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
> +				     unsigned long address,
> +				     pgtbl_mod_mask *mod_mask)
> +{
> +	if (unlikely(pud_none(*pud))) {
> +		if (__pmd_alloc(mm, pud, address))
> +			return NULL;
> +		*mod_mask |= PGTBL_PUD_MODIFIED;
> +	}
> +
> +	return pmd_offset(pud, address);
> +}
> +#endif /* CONFIG_MMU */
> +
> +#define pte_alloc_kernel_track(pmd, address, mask)			\
> +	((unlikely(pmd_none(*(pmd))) &&					\
> +	  (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
> +		NULL: pte_offset_kernel(pmd, address))
> +
> +#endif /* _LINUX_PGALLLC_TRACK_H */
> diff --git a/lib/ioremap.c b/lib/ioremap.c
> index ad485f08173b..608fcccd21c8 100644
> --- a/lib/ioremap.c
> +++ b/lib/ioremap.c
> @@ -11,6 +11,7 @@
>  #include <linux/sched.h>
>  #include <linux/io.h>
>  #include <linux/export.h>
> +#include <linux/pgalloc-track.h>
>  #include <asm/cacheflush.h>
>  #include <asm/pgtable.h>
>  
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 3091c2ca60df..edc43f003165 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -35,6 +35,7 @@
>  #include <linux/bitops.h>
>  #include <linux/rbtree_augmented.h>
>  #include <linux/overflow.h>
> +#include <linux/pgalloc-track.h>
>  
>  #include <linux/uaccess.h>
>  #include <asm/tlbflush.h>
> -- 
> 2.26.2
> 

-- 
Sincerely yours,
Mike.

Re: [PATCH] mm: Move p?d_alloc_track to separate header file

[Christophe Leroy]

Le 09/06/2020 à 14:05, Joerg Roedel a écrit :
> From: Joerg Roedel <jroedel@suse.de>
> 
> The functions are only used in two source files, so there is no need
> for them to be in the global <linux/mm.h> header. Move them to the new
> <linux/pgalloc-track.h> header and include it only where needed.

Do you mean we will now create a new header file for any new couple on 
functions based on where they are used ?

Can you explain why this change is needed or is a plus ?

Christophe

> 
> Signed-off-by: Joerg Roedel <jroedel@suse.de>
> ---
>   include/linux/mm.h            | 45 -------------------------------
>   include/linux/pgalloc-track.h | 51 +++++++++++++++++++++++++++++++++++
>   lib/ioremap.c                 |  1 +
>   mm/vmalloc.c                  |  1 +
>   4 files changed, 53 insertions(+), 45 deletions(-)
>   create mode 100644 include/linux/pgalloc-track.h
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 9d6042178ca7..22d8b2a2c9bc 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2092,51 +2092,11 @@ static inline pud_t *pud_alloc(struct mm_struct *mm, p4d_t *p4d,
>   		NULL : pud_offset(p4d, address);
>   }
>   
> -static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
> -				     unsigned long address,
> -				     pgtbl_mod_mask *mod_mask)
> -
> -{
> -	if (unlikely(pgd_none(*pgd))) {
> -		if (__p4d_alloc(mm, pgd, address))
> -			return NULL;
> -		*mod_mask |= PGTBL_PGD_MODIFIED;
> -	}
> -
> -	return p4d_offset(pgd, address);
> -}
> -
> -static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
> -				     unsigned long address,
> -				     pgtbl_mod_mask *mod_mask)
> -{
> -	if (unlikely(p4d_none(*p4d))) {
> -		if (__pud_alloc(mm, p4d, address))
> -			return NULL;
> -		*mod_mask |= PGTBL_P4D_MODIFIED;
> -	}
> -
> -	return pud_offset(p4d, address);
> -}
> -
>   static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
>   {
>   	return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))?
>   		NULL: pmd_offset(pud, address);
>   }
> -
> -static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
> -				     unsigned long address,
> -				     pgtbl_mod_mask *mod_mask)
> -{
> -	if (unlikely(pud_none(*pud))) {
> -		if (__pmd_alloc(mm, pud, address))
> -			return NULL;
> -		*mod_mask |= PGTBL_PUD_MODIFIED;
> -	}
> -
> -	return pmd_offset(pud, address);
> -}
>   #endif /* CONFIG_MMU */
>   
>   #if USE_SPLIT_PTE_PTLOCKS
> @@ -2252,11 +2212,6 @@ static inline void pgtable_pte_page_dtor(struct page *page)
>   	((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \
>   		NULL: pte_offset_kernel(pmd, address))
>   
> -#define pte_alloc_kernel_track(pmd, address, mask)			\
> -	((unlikely(pmd_none(*(pmd))) &&					\
> -	  (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
> -		NULL: pte_offset_kernel(pmd, address))
> -
>   #if USE_SPLIT_PMD_PTLOCKS
>   
>   static struct page *pmd_to_page(pmd_t *pmd)
> diff --git a/include/linux/pgalloc-track.h b/include/linux/pgalloc-track.h
> new file mode 100644
> index 000000000000..1dcc865029a2
> --- /dev/null
> +++ b/include/linux/pgalloc-track.h
> @@ -0,0 +1,51 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_PGALLLC_TRACK_H
> +#define _LINUX_PGALLLC_TRACK_H
> +
> +#if defined(CONFIG_MMU)
> +static inline p4d_t *p4d_alloc_track(struct mm_struct *mm, pgd_t *pgd,
> +				     unsigned long address,
> +				     pgtbl_mod_mask *mod_mask)
> +{
> +	if (unlikely(pgd_none(*pgd))) {
> +		if (__p4d_alloc(mm, pgd, address))
> +			return NULL;
> +		*mod_mask |= PGTBL_PGD_MODIFIED;
> +	}
> +
> +	return p4d_offset(pgd, address);
> +}
> +
> +static inline pud_t *pud_alloc_track(struct mm_struct *mm, p4d_t *p4d,
> +				     unsigned long address,
> +				     pgtbl_mod_mask *mod_mask)
> +{
> +	if (unlikely(p4d_none(*p4d))) {
> +		if (__pud_alloc(mm, p4d, address))
> +			return NULL;
> +		*mod_mask |= PGTBL_P4D_MODIFIED;
> +	}
> +
> +	return pud_offset(p4d, address);
> +}
> +
> +static inline pmd_t *pmd_alloc_track(struct mm_struct *mm, pud_t *pud,
> +				     unsigned long address,
> +				     pgtbl_mod_mask *mod_mask)
> +{
> +	if (unlikely(pud_none(*pud))) {
> +		if (__pmd_alloc(mm, pud, address))
> +			return NULL;
> +		*mod_mask |= PGTBL_PUD_MODIFIED;
> +	}
> +
> +	return pmd_offset(pud, address);
> +}
> +#endif /* CONFIG_MMU */
> +
> +#define pte_alloc_kernel_track(pmd, address, mask)			\
> +	((unlikely(pmd_none(*(pmd))) &&					\
> +	  (__pte_alloc_kernel(pmd) || ({*(mask)|=PGTBL_PMD_MODIFIED;0;})))?\
> +		NULL: pte_offset_kernel(pmd, address))
> +
> +#endif /* _LINUX_PGALLLC_TRACK_H */
> diff --git a/lib/ioremap.c b/lib/ioremap.c
> index ad485f08173b..608fcccd21c8 100644
> --- a/lib/ioremap.c
> +++ b/lib/ioremap.c
> @@ -11,6 +11,7 @@
>   #include <linux/sched.h>
>   #include <linux/io.h>
>   #include <linux/export.h>
> +#include <linux/pgalloc-track.h>
>   #include <asm/cacheflush.h>
>   #include <asm/pgtable.h>
>   
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 3091c2ca60df..edc43f003165 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -35,6 +35,7 @@
>   #include <linux/bitops.h>
>   #include <linux/rbtree_augmented.h>
>   #include <linux/overflow.h>
> +#include <linux/pgalloc-track.h>
>   
>   #include <linux/uaccess.h>
>   #include <asm/tlbflush.h>
> 

Re: [PATCH] mm: Move p?d_alloc_track to separate header file

[Stephen Rothwell]

[-- Attachment #1: Type: text/plain, Size: 919 bytes --]

Hi Christophe,

On Tue, 9 Jun 2020 17:24:14 +0200 Christophe Leroy <christophe.leroy@csgroup.eu> wrote:
>
> Le 09/06/2020 à 14:05, Joerg Roedel a écrit :
> > From: Joerg Roedel <jroedel@suse.de>
> > 
> > The functions are only used in two source files, so there is no need
> > for them to be in the global <linux/mm.h> header. Move them to the new
> > <linux/pgalloc-track.h> header and include it only where needed.  
> 
> Do you mean we will now create a new header file for any new couple on 
> functions based on where they are used ?
> 
> Can you explain why this change is needed or is a plus ?

Well at a minimum, it means 45 lines less to be parsed every time the
linux/mm is included (in at last count, 1996 places some of which are
include files included by other files).  And, as someone who does a lot
of builds every day, I am in favour of that :-)

-- 
Cheers,
Stephen Rothwell

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Re: [PATCH] mm: Move p?d_alloc_track to separate header file

[Andrew Morton]

On Tue,  9 Jun 2020 14:05:33 +0200 Joerg Roedel <joro@8bytes.org> wrote:

> From: Joerg Roedel <jroedel@suse.de>
> 
> The functions are only used in two source files, so there is no need
> for them to be in the global <linux/mm.h> header. Move them to the new
> <linux/pgalloc-track.h> header and include it only where needed.
> 
> ...
>
> new file mode 100644
> index 000000000000..1dcc865029a2
> --- /dev/null
> +++ b/include/linux/pgalloc-track.h
> @@ -0,0 +1,51 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_PGALLLC_TRACK_H
> +#define _LINUX_PGALLLC_TRACK_H

hm, no #includes.  I guess this is OK, given the limited use.

But it does make one wonder whether ioremap.c should be moved from lib/
to mm/ and this file should be moved from include/linux/ to mm/.

Oh well.

Re: [PATCH] mm: Move p?d_alloc_track to separate header file

[Stephen Rothwell]

[-- Attachment #1: Type: text/plain, Size: 669 bytes --]

Hi Joerg,

Sorry for the late reply.

On Tue,  9 Jun 2020 14:05:33 +0200 Joerg Roedel <joro@8bytes.org> wrote:
>
> diff --git a/include/linux/pgalloc-track.h b/include/linux/pgalloc-track.h
> new file mode 100644
> index 000000000000..1dcc865029a2
> --- /dev/null
> +++ b/include/linux/pgalloc-track.h
> @@ -0,0 +1,51 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#ifndef _LINUX_PGALLLC_TRACK_H
> +#define _LINUX_PGALLLC_TRACK_H
> +

Maybe this could have a comment that it should always be included after
mm.h or we could add enough to make it standalone (even just an include
of mm.h would probably be enough).

-- 
Cheers,
Stephen Rothwell

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Re: [PATCH] mm: Move p?d_alloc_track to separate header file

[Mike Rapoport]

On Wed, Jun 17, 2020 at 06:12:26PM -0700, Andrew Morton wrote:
> On Tue,  9 Jun 2020 14:05:33 +0200 Joerg Roedel <joro@8bytes.org> wrote:
> 
> > From: Joerg Roedel <jroedel@suse.de>
> > 
> > The functions are only used in two source files, so there is no need
> > for them to be in the global <linux/mm.h> header. Move them to the new
> > <linux/pgalloc-track.h> header and include it only where needed.
> > 
> > ...
> >
> > new file mode 100644
> > index 000000000000..1dcc865029a2
> > --- /dev/null
> > +++ b/include/linux/pgalloc-track.h
> > @@ -0,0 +1,51 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +#ifndef _LINUX_PGALLLC_TRACK_H
> > +#define _LINUX_PGALLLC_TRACK_H
> 
> hm, no #includes.  I guess this is OK, given the limited use.
> 
> But it does make one wonder whether ioremap.c should be moved from lib/
> to mm/ and this file should be moved from include/linux/ to mm/.

It makes sense, but I am anyway planning consolidation of pgalloc.h, so
most probably pgalloc-track will not survive until 5.9-rc1 :)

If you think that it worth moving ioremap.c to mm/ regardless of chrun,
I can send a patch for that.

> Oh well.

-- 
Sincerely yours,
Mike.