@@ -96,6 +96,14 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd)
#endif
}
+static inline void pte_alloc_clear(pte_t *pte)
+{
+ int i;
+
+ for (i = 0; i < PTRS_PER_PTE; i++)
+ pte[i] = __pte(0);
+}
+
__init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
pte_t *pte;
@@ -109,18 +117,24 @@ __init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long add
if (pte)
clear_page(pte);
}
+ if (pte && !pte_none(*pte))
+ pte_alloc_clear(pte);
return pte;
}
pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
struct page *ptepage;
+ pte_t *pte;
gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO;
ptepage = alloc_pages(flags, 0);
if (!ptepage)
return NULL;
+ pte = (pte_t *)pfn_to_kaddr(page_to_pfn(ptepage));
+ if (!pte_none(*pte))
+ pte_alloc_clear(pte);
if (!pgtable_page_ctor(ptepage)) {
__free_page(ptepage);
return NULL;
Some HW invert some PTE bits. In some case, __pte(0) is not 0 so the PTEs shall be properly set prior to being used. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> --- arch/powerpc/mm/pgtable_32.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)