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powerpc/8xx: Modify ptep_get() 

Move ptep_get() close to pte_update(), in an ifdef section already
dedicated to powerpc 8xx. This section contains explanation about
the layout of page table entries.

Also modify it to return 4 times the pte value instead of padding
with zeroes.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/9f2df6621fcaf9eba15fadc61c169d0c8e2fb849.1592481938.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-06-18 12:07:46 +00:00 committed by Michael Ellerman
parent 86590e524e
commit 105fb38124
1 changed files with 12 additions and 10 deletions
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22
arch/powerpc/include/asm/nohash/32/pgtable.h
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@ -249,6 +249,18 @@ static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, p
return old;
}
#ifdef CONFIG_PPC_16K_PAGES
#define __HAVE_ARCH_PTEP_GET
static inline pte_t ptep_get(pte_t *ptep)
{
pte_basic_t val = READ_ONCE(ptep->pte);
pte_t pte = {val, val, val, val};
return pte;
}
#endif /* CONFIG_PPC_16K_PAGES */
#else
static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
unsigned long clr, unsigned long set, int huge)
@ -284,16 +296,6 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
return __pte(pte_update(mm, addr, ptep, ~0, 0, 0));
}
#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PPC_16K_PAGES)
#define __HAVE_ARCH_PTEP_GET
static inline pte_t ptep_get(pte_t *ptep)
{
pte_t pte = {READ_ONCE(ptep->pte), 0, 0, 0};
return pte;
}
#endif
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
pte_t *ptep)