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 --- a/arch/mips/include/asm/pgtable.h
  32 +++ b/arch/mips/include/asm/pgtable.h
  33 @@ -632,6 +632,7 @@ static inline pmd_t pmd_mkdirty(pmd_t pm
  34         return pmd;
  35  }
  36
  37 +#define pmd_young pmd_young
  38  static inline int pmd_young(pmd_t pmd)
  39  {
  40         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
  41 --- a/arch/riscv/include/asm/pgtable.h
  42 +++ b/arch/riscv/include/asm/pgtable.h
  43 @@ -535,6 +535,7 @@ static inline int pmd_dirty(pmd_t pmd)
  44         return pte_dirty(pmd_pte(pmd));
  45  }
  46
  47 +#define pmd_young pmd_young
  48  static inline int pmd_young(pmd_t pmd)
  49  {
  50         return pte_young(pmd_pte(pmd));
  51 --- a/arch/s390/include/asm/pgtable.h
  52 +++ b/arch/s390/include/asm/pgtable.h
  53 @@ -748,6 +748,7 @@ static inline int pmd_dirty(pmd_t pmd)
  54         return (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) != 0;
  55  }
  56
  57 +#define pmd_young pmd_young
  58  static inline int pmd_young(pmd_t pmd)
  59  {
  60         return (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0;
  61 --- a/arch/sparc/include/asm/pgtable_64.h
  62 +++ b/arch/sparc/include/asm/pgtable_64.h
  63 @@ -712,6 +712,7 @@ static inline unsigned long pmd_dirty(pm
  64         return pte_dirty(pte);
  65  }
  66
  67 +#define pmd_young pmd_young
  68  static inline unsigned long pmd_young(pmd_t pmd)
  69  {
  70         pte_t pte = __pte(pmd_val(pmd));
  71 --- a/arch/x86/include/asm/pgtable.h
  72 +++ b/arch/x86/include/asm/pgtable.h
  73 @@ -136,6 +136,7 @@ static inline int pmd_dirty(pmd_t pmd)
  74         return pmd_flags(pmd) & _PAGE_DIRTY;
  75  }
  76
  77 +#define pmd_young pmd_young
  78  static inline int pmd_young(pmd_t pmd)
  79  {
  80         return pmd_flags(pmd) & _PAGE_ACCESSED;
  81 --- a/include/linux/pgtable.h
  82 +++ b/include/linux/pgtable.h
  83 @@ -164,6 +164,13 @@ static inline pte_t *virt_to_kpte(unsign
  84         return pmd_none(*pmd) ? NULL : pte_offset_kernel(pmd, vaddr);
  85  }
  86
  87 +#ifndef pmd_young
  88 +static inline int pmd_young(pmd_t pmd)
  89 +{
  90 +       return 0;
  91 +}
  92 +#endif
  93 +
  94  #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
  95  extern int ptep_set_access_flags(struct vm_area_struct *vma,
  96                                  unsigned long address, pte_t *ptep,