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LoongArch: Let pmd_present() return true when splitting pmd 

When we split a pmd into ptes, pmd_present() and pmd_trans_huge() should
return true, otherwise it would be treated as a swap pmd.

This is the same as arm64 does in commit b65399f611 ("arm64/mm: Change
THP helpers to comply with generic MM semantics"), we also add a new bit
named _PAGE_PRESENT_INVALID for LoongArch.

Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Hongchen Zhang 2023-06-15 14:35:52 +08:00 committed by Huacai Chen
parent 858fd168a9
commit ddc1729b07
2 changed files with 4 additions and 1 deletions
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2
arch/loongarch/include/asm/pgtable-bits.h
View File

@ -22,12 +22,14 @@
#define _PAGE_PFN_SHIFT 12
#define _PAGE_SWP_EXCLUSIVE_SHIFT 23
#define _PAGE_PFN_END_SHIFT 48
#define _PAGE_PRESENT_INVALID_SHIFT 60
#define _PAGE_NO_READ_SHIFT 61
#define _PAGE_NO_EXEC_SHIFT 62
#define _PAGE_RPLV_SHIFT 63
/* Used by software */
#define _PAGE_PRESENT (_ULCAST_(1) << _PAGE_PRESENT_SHIFT)
#define _PAGE_PRESENT_INVALID (_ULCAST_(1) << _PAGE_PRESENT_INVALID_SHIFT)
#define _PAGE_WRITE (_ULCAST_(1) << _PAGE_WRITE_SHIFT)
#define _PAGE_ACCESSED (_ULCAST_(1) << _PAGE_ACCESSED_SHIFT)
#define _PAGE_MODIFIED (_ULCAST_(1) << _PAGE_MODIFIED_SHIFT)

3
arch/loongarch/include/asm/pgtable.h
View File

@ -213,7 +213,7 @@ static inline int pmd_bad(pmd_t pmd)
static inline int pmd_present(pmd_t pmd)
{
if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE));
return !!(pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PRESENT_INVALID));
return pmd_val(pmd) != (unsigned long)invalid_pte_table;
}
@ -558,6 +558,7 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
static inline pmd_t pmd_mkinvalid(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_PRESENT_INVALID;
pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY | _PAGE_PROTNONE);
return pmd;