target/linux/generic/backport-5.15/020-v6.1-17-mm-add-dummy-pmd_young-for-architectures-not-having-.patch

   1 From c5ec455ebd2b488d91de9d8915a0c8036a2a04dd Mon Sep 17 00:00:00 2001
   2 From: Juergen Gross <jgross@suse.com>
   3 Date: Wed, 30 Nov 2022 14:49:41 -0800
   4 Subject: [PATCH 17/29] mm: add dummy pmd_young() for architectures not having
   5  it
   6
   7 In order to avoid #ifdeffery add a dummy pmd_young() implementation as a
   8 fallback.  This is required for the later patch "mm: introduce
   9 arch_has_hw_nonleaf_pmd_young()".
  10
  11 Link: https://lkml.kernel.org/r/fd3ac3cd-7349-6bbd-890a-71a9454ca0b3@suse.com
  12 Signed-off-by: Juergen Gross <jgross@suse.com>
  13 Acked-by: Yu Zhao <yuzhao@google.com>
  14 Cc: Borislav Petkov <bp@alien8.de>
  15 Cc: Dave Hansen <dave.hansen@linux.intel.com>
  16 Cc: Geert Uytterhoeven <geert@linux-m68k.org>
  17 Cc: "H. Peter Anvin" <hpa@zytor.com>
  18 Cc: Ingo Molnar <mingo@redhat.com>
  19 Cc: Sander Eikelenboom <linux@eikelenboom.it>
  20 Cc: Thomas Gleixner <tglx@linutronix.de>
  21 Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
  22 ---
  23  arch/mips/include/asm/pgtable.h     | 1 +
  24  arch/riscv/include/asm/pgtable.h    | 1 +
  25  arch/s390/include/asm/pgtable.h     | 1 +
  26  arch/sparc/include/asm/pgtable_64.h | 1 +
  27  arch/x86/include/asm/pgtable.h      | 1 +
  28  include/linux/pgtable.h             | 7 +++++++
  29  6 files changed, 12 insertions(+)
  30
  31 diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
  32 index 804889b70965..89ab8b4cf971 100644
  33 --- a/arch/mips/include/asm/pgtable.h
  34 +++ b/arch/mips/include/asm/pgtable.h
  35 @@ -632,6 +632,7 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd)
  36         return pmd;
  37  }
  38
  39 +#define pmd_young pmd_young
  40  static inline int pmd_young(pmd_t pmd)
  41  {
  42         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
  43 diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
  44 index 39b550310ec6..4a64e03dcdd4 100644
  45 --- a/arch/riscv/include/asm/pgtable.h
  46 +++ b/arch/riscv/include/asm/pgtable.h
  47 @@ -531,6 +531,7 @@ static inline int pmd_dirty(pmd_t pmd)
  48         return pte_dirty(pmd_pte(pmd));
  49  }
  50
  51 +#define pmd_young pmd_young
  52  static inline int pmd_young(pmd_t pmd)
  53  {
  54         return pte_young(pmd_pte(pmd));
  55 diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
  56 index b61426c9ef17..55ff4f22da2d 100644
  57 --- a/arch/s390/include/asm/pgtable.h
  58 +++ b/arch/s390/include/asm/pgtable.h
  59 @@ -748,6 +748,7 @@ static inline int pmd_dirty(pmd_t pmd)
  60         return (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) != 0;
  61  }
  62
  63 +#define pmd_young pmd_young
  64  static inline int pmd_young(pmd_t pmd)
  65  {
  66         return (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0;
  67 diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h
  68 index 4679e45c8348..bfd10179c137 100644
  69 --- a/arch/sparc/include/asm/pgtable_64.h
  70 +++ b/arch/sparc/include/asm/pgtable_64.h
  71 @@ -712,6 +712,7 @@ static inline unsigned long pmd_dirty(pmd_t pmd)
  72         return pte_dirty(pte);
  73  }
  74
  75 +#define pmd_young pmd_young
  76  static inline unsigned long pmd_young(pmd_t pmd)
  77  {
  78         pte_t pte = __pte(pmd_val(pmd));
  79 diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
  80 index 01a1763123ff..c4b64ee357fd 100644
  81 --- a/arch/x86/include/asm/pgtable.h
  82 +++ b/arch/x86/include/asm/pgtable.h
  83 @@ -136,6 +136,7 @@ static inline int pmd_dirty(pmd_t pmd)
  84         return pmd_flags(pmd) & _PAGE_DIRTY;
  85  }
  86
  87 +#define pmd_young pmd_young
  88  static inline int pmd_young(pmd_t pmd)
  89  {
  90         return pmd_flags(pmd) & _PAGE_ACCESSED;
  91 diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
  92 index e6889556e0bf..dec3d890e814 100644
  93 --- a/include/linux/pgtable.h
  94 +++ b/include/linux/pgtable.h
  95 @@ -164,6 +164,13 @@ static inline pte_t *virt_to_kpte(unsigned long vaddr)
  96         return pmd_none(*pmd) ? NULL : pte_offset_kernel(pmd, vaddr);
  97  }
  98
  99 +#ifndef pmd_young
 100 +static inline int pmd_young(pmd_t pmd)
 101 +{
 102 +       return 0;
 103 +}
 104 +#endif
 105 +
 106  #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 107  extern int ptep_set_access_flags(struct vm_area_struct *vma,
 108                                  unsigned long address, pte_t *ptep,
 109 --
 110 2.40.0
 111