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powerpc/mm: use pte helpers in generic code

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Get rid of platform specific _PAGE_XXXX in powerpc common code and
use helpers instead.

mm/dump_linuxpagetables.c will be handled separately

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2018-10-09 13:51:56 +00:00
committed by Michael Ellerman
parent 34eb138ed7
commit 26973fa5ac
7 changed files with 41 additions and 45 deletions
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9
arch/powerpc/include/asm/book3s/32/pgtable.h
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@@ -331,17 +331,14 @@ static inline bool pte_ci(pte_t pte)
#define pte_access_permitted pte_access_permitted
static inline bool pte_access_permitted(pte_t pte, bool write)
{
unsigned long pteval = pte_val(pte);
/*
* A read-only access is controlled by _PAGE_USER bit.
* We have _PAGE_READ set for WRITE and EXECUTE
*/
unsigned long need_pte_bits = _PAGE_PRESENT | _PAGE_USER;
if (!pte_present(pte) || !pte_user(pte) || !pte_read(pte))
return false;
if (write)
need_pte_bits |= _PAGE_WRITE;
if ((pteval & need_pte_bits) != need_pte_bits)
if (write && !pte_write(pte))
return false;
return true;