mm: move p?d_alloc_track to separate header file

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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Matthew Wilcox <willy@infradead.org>
Link: http://lkml.kernel.org/r/20200609120533.25867-1-joro@8bytes.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/mm.h

@@ -2103,51 +2103,11 @@ 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
@@ -2263,11 +2223,6 @@ 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)

mm/ioremap.c

@@ -13,6 +13,8 @@
 #include <linux/export.h>
 #include <asm/cacheflush.h>
 
+#include "pgalloc-track.h"
+
 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
 static int __read_mostly ioremap_p4d_capable;
 static int __read_mostly ioremap_pud_capable;

mm/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 */

mm/vmalloc.c

@@ -41,6 +41,7 @@
 #include <asm/shmparam.h>
 
 #include "internal.h"
+#include "pgalloc-track.h"
 
 bool is_vmalloc_addr(const void *x)
 {