The patch titled
Subject: mips: mm: add p?d_leaf() definitions
has been added to the -mm tree. Its filename is
mips-mm-add-pd_leaf-definitions.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mips-mm-add-pd_leaf-definitions.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mips-mm-add-pd_leaf-definitions.patch
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------------------------------------------------------
From: Steven Price <steven.price@xxxxxxx>
Subject: mips: mm: add p?d_leaf() definitions
walk_page_range() is going to be allowed to walk page tables other than
those of user space. For this it needs to know when it has reached a
'leaf' entry in the page tables. This information is provided by the
p?d_leaf() functions/macros.
For mips, we only support large pages on 64 bit.
For 64 bit if _PAGE_HUGE is defined we can simply look for it. When not
defined we can be confident that there are no leaf pages in existence and
fall back on the generic implementation (added in a later patch) which
returns 0.
Link: http://lkml.kernel.org/r/20190722154210.42799-5-steven.price@xxxxxxx
Signed-off-by: Steven Price <steven.price@xxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/mips/include/asm/pgtable-64.h | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/arch/mips/include/asm/pgtable-64.h~mips-mm-add-pd_leaf-definitions
+++ a/arch/mips/include/asm/pgtable-64.h
@@ -273,6 +273,10 @@ static inline int pmd_present(pmd_t pmd)
return pmd_val(pmd) != (unsigned long) invalid_pte_table;
}
+#ifdef _PAGE_HUGE
+#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
+#endif
+
static inline void pmd_clear(pmd_t *pmdp)
{
pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
@@ -297,6 +301,10 @@ static inline int pud_present(pud_t pud)
return pud_val(pud) != (unsigned long) invalid_pmd_table;
}
+#ifdef _PAGE_HUGE
+#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
+#endif
+
static inline void pud_clear(pud_t *pudp)
{
pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
_
Patches currently in -mm which might be from steven.price@xxxxxxx are
arc-mm-add-pd_leaf-definitions.patch
arm-mm-add-pd_leaf-definitions.patch
arm64-mm-add-pd_leaf-definitions.patch
mips-mm-add-pd_leaf-definitions.patch
powerpc-mm-add-pd_leaf-definitions.patch
riscv-mm-add-pd_leaf-definitions.patch
s390-mm-add-pd_leaf-definitions.patch
sparc-mm-add-pd_leaf-definitions.patch
x86-mm-add-pd_leaf-definitions.patch
mm-add-generic-pd_leaf-macros.patch
mm-pagewalk-add-p4d_entry-and-pgd_entry.patch
mm-pagewalk-allow-walking-without-vma.patch
mm-pagewalk-add-test_pd-callbacks.patch
x86-mm-dont-display-pages-which-arent-present-in-debugfs.patch
x86-mm-point-to-struct-seq_file-from-struct-pg_state.patch
x86-mmefi-convert-ptdump_walk_pgd_level-to-take-a-mm_struct.patch
x86-mm-convert-ptdump_walk_pgd_level_debugfs-to-take-an-mm_struct.patch
x86-mm-convert-ptdump_walk_pgd_level_core-to-take-an-mm_struct.patch
mm-add-generic-ptdump.patch
x86-mm-convert-dump_pagetables-to-use-walk_page_range.patch
arm64-mm-convert-mm-dumpc-to-use-walk_page_range.patch
