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powerpc/32s: Add _PAGE_WRITE to supplement _PAGE_RW

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Several places, _PAGE_RW maps to write permission and don't
always imply read. To make it more clear, do as book3s/64 in
commit c7d54842de ("powerpc/mm: Use _PAGE_READ to indicate
Read access") and use _PAGE_WRITE when more relevant.

For the time being _PAGE_WRITE is equivalent to _PAGE_RW but that
will change when _PAGE_READ gets added in following patches.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/5798782869fe4d2698f104948dabd17657b89395.1695659959.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2023-09-25 20:31:47 +02:00
committed by Michael Ellerman
parent ed815bd3fe
commit 46ebef51fd
4 changed files with 22 additions and 13 deletions
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15
arch/powerpc/include/asm/book3s/32/pgtable.h
View File

@@ -31,6 +31,8 @@
#define _PAGE_RW 0x400 /* software: user write access allowed */
#define _PAGE_SPECIAL 0x800 /* software: Special page */
#define _PAGE_WRITE _PAGE_RW
#ifdef CONFIG_PTE_64BIT
/* We never clear the high word of the pte */
#define _PTE_NONE_MASK (0xffffffff00000000ULL | _PAGE_HASHPTE)
@@ -347,7 +349,7 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)
{
pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
pte_update(mm, addr, ptep, _PAGE_WRITE, 0, 0);
}
static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
@@ -406,7 +408,11 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
}
/* Generic accessors to PTE bits */
static inline int pte_write(pte_t pte) { return !!(pte_val(pte) & _PAGE_RW);}
static inline bool pte_write(pte_t pte)
{
return !!(pte_val(pte) & _PAGE_WRITE);
}
static inline int pte_read(pte_t pte) { return 1; }
static inline int pte_dirty(pte_t pte) { return !!(pte_val(pte) & _PAGE_DIRTY); }
static inline int pte_young(pte_t pte) { return !!(pte_val(pte) & _PAGE_ACCESSED); }
@@ -469,7 +475,7 @@ static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
/* Generic modifiers for PTE bits */
static inline pte_t pte_wrprotect(pte_t pte)
{
return __pte(pte_val(pte) & ~_PAGE_RW);
return __pte(pte_val(pte) & ~_PAGE_WRITE);
}
static inline pte_t pte_exprotect(pte_t pte)
@@ -499,6 +505,9 @@ static inline pte_t pte_mkpte(pte_t pte)
static inline pte_t pte_mkwrite_novma(pte_t pte)
{
/*
* write implies read, hence set both
*/
return __pte(pte_val(pte) | _PAGE_RW);
}