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Subject[PATCH v3 2/2] powerpc/32: drop get_pteptr()
Date
Commit 8d30c14cab30 ("powerpc/mm: Rework I$/D$ coherency (v3)") and
commit 90ac19a8b21b ("[POWERPC] Abolish iopa(), mm_ptov(),
io_block_mapping() from arch/powerpc") removed the use of get_pteptr()
outside of mm/pgtable_32.c

In mm/pgtable_32.c, the only user of get_pteptr() is change_page_attr()
which operates on kernel context and on lowmem pages only.

Make virt_to_kpte() available outside of mm/mem.c and use it instead
of get_pteptr(), and drop get_pteptr()

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
v3: new
---
arch/powerpc/include/asm/pgtable.h | 5 +++++
arch/powerpc/mm/mem.c | 5 -----
arch/powerpc/mm/pgtable_32.c | 39 ++------------------------------------
3 files changed, 7 insertions(+), 42 deletions(-)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index b5e358c0ea7e..25588edc7601 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -51,6 +51,11 @@ static inline pmd_t *pmd_ptr_k(unsigned long va)
{
return pmd_offset(pud_offset(pgd_offset_k(va), va), va);
}
+
+static inline pte_t *virt_to_kpte(unsigned long vaddr)
+{
+ return pte_offset_kernel(pmd_ptr_k(vaddr), vaddr);
+}
#endif

#include <asm/tlbflush.h>
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 942d41b88aa6..da6708a46ce9 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -65,11 +65,6 @@ pte_t *kmap_pte;
EXPORT_SYMBOL(kmap_pte);
pgprot_t kmap_prot;
EXPORT_SYMBOL(kmap_prot);
-
-static inline pte_t *virt_to_kpte(unsigned long vaddr)
-{
- return pte_offset_kernel(pmd_ptr_k(vaddr), vaddr);
-}
#endif

pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 7d50cc01bbea..4e1e5237c16c 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -121,44 +121,9 @@ void __init mapin_ram(void)
}
}

-/* Scan the real Linux page tables and return a PTE pointer for
- * a virtual address in a context.
- * Returns true (1) if PTE was found, zero otherwise. The pointer to
- * the PTE pointer is unmodified if PTE is not found.
- */
-static int
-get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)
-{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- int retval = 0;
-
- pgd = pgd_offset(mm, addr & PAGE_MASK);
- if (pgd) {
- pud = pud_offset(pgd, addr & PAGE_MASK);
- if (pud && pud_present(*pud)) {
- pmd = pmd_offset(pud, addr & PAGE_MASK);
- if (pmd_present(*pmd)) {
- pte = pte_offset_map(pmd, addr & PAGE_MASK);
- if (pte) {
- retval = 1;
- *ptep = pte;
- if (pmdp)
- *pmdp = pmd;
- /* XXX caller needs to do pte_unmap, yuck */
- }
- }
- }
- }
- return(retval);
-}
-
static int __change_page_attr_noflush(struct page *page, pgprot_t prot)
{
pte_t *kpte;
- pmd_t *kpmd;
unsigned long address;

BUG_ON(PageHighMem(page));
@@ -166,10 +131,10 @@ static int __change_page_attr_noflush(struct page *page, pgprot_t prot)

if (v_block_mapped(address))
return 0;
- if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
+ kpte = virt_to_kpte(address);
+ if (!kpte)
return -EINVAL;
__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
- pte_unmap(kpte);

return 0;
}
--
2.13.3
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