linux-kernel - [PATCH 1/2] mm: Move the backup x_devmap() functions to asm-generic/pgtable.h

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Message-Id: <20191115115808.21181-1-thomas_os@shipmail.org>
Date:   Fri, 15 Nov 2019 12:58:07 +0100
From:   Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Thomas Hellstrom <thellstrom@...are.com>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Matthew Wilcox" <willy@...radead.org>
Subject: [PATCH 1/2] mm: Move the backup x_devmap() functions to asm-generic/pgtable.h

From: Thomas Hellstrom <thellstrom@...are.com>

The asm-generic/pgtable.h include file appears to be the correct place
for the backup x_devmap() inline functions. Moving them here is also
necessary if we want to include x_devmap() in the [pmd|pud]_unstable
functions. So move the x_devmap() functions to asm-generic/pgtable.h

Cc: Arnd Bergmann <arnd@...db.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: "Matthew Wilcox" <willy@...radead.org>
Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
---
 include/asm-generic/pgtable.h | 15 +++++++++++++++
 include/linux/mm.h            | 15 ---------------
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 818691846c90..8efa45580fd0 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -903,6 +903,21 @@ static inline int pud_write(pud_t pud)
 }
 #endif /* pud_write */
 
+#if !defined(CONFIG_ARCH_HAS_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
+static inline int pmd_devmap(pmd_t pmd)
+{
+	return 0;
+}
+static inline int pud_devmap(pud_t pud)
+{
+	return 0;
+}
+static inline int pgd_devmap(pgd_t pgd)
+{
+	return 0;
+}
+#endif
+
 #if !defined(CONFIG_TRANSPARENT_HUGEPAGE) || \
 	(defined(CONFIG_TRANSPARENT_HUGEPAGE) && \
 	 !defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD))
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4bc93477375e..78a09ff33cd7 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -564,21 +564,6 @@ int vma_is_stack_for_current(struct vm_area_struct *vma);
 struct mmu_gather;
 struct inode;
 
-#if !defined(CONFIG_ARCH_HAS_PTE_DEVMAP) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
-static inline int pmd_devmap(pmd_t pmd)
-{
-	return 0;
-}
-static inline int pud_devmap(pud_t pud)
-{
-	return 0;
-}
-static inline int pgd_devmap(pgd_t pgd)
-{
-	return 0;
-}
-#endif
-
 /*
  * FIXME: take this include out, include page-flags.h in
  * files which need it (119 of them)
-- 
2.21.0