ARM: make_coherent: avoid recalculating the pfn for the modified page
We already know the pfn for the page to be modified in make_coherent,
so let's stop recalculating it unnecessarily.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
index 8e9bc51..ae88f2c 100644
--- a/arch/arm/mm/fault-armv.c
+++ b/arch/arm/mm/fault-armv.c
@@ -37,7 +37,7 @@
* without CONFIG_CPU_CACHE_VIPT) cannot support split page_table_lock.
*/
static int do_adjust_pte(struct vm_area_struct *vma, unsigned long address,
- pte_t *ptep)
+ unsigned long pfn, pte_t *ptep)
{
pte_t entry = *ptep;
int ret;
@@ -52,7 +52,6 @@
* fault (ie, is old), we can safely ignore any issues.
*/
if (ret && (pte_val(entry) & L_PTE_MT_MASK) != shared_pte_mask) {
- unsigned long pfn = pte_pfn(entry);
flush_cache_page(vma, address, pfn);
outer_flush_range((pfn << PAGE_SHIFT),
(pfn << PAGE_SHIFT) + PAGE_SIZE);
@@ -65,7 +64,8 @@
return ret;
}
-static int adjust_pte(struct vm_area_struct *vma, unsigned long address)
+static int adjust_pte(struct vm_area_struct *vma, unsigned long address,
+ unsigned long pfn)
{
spinlock_t *ptl;
pgd_t *pgd;
@@ -90,7 +90,7 @@
pte = pte_offset_map_nested(pmd, address);
spin_lock(ptl);
- ret = do_adjust_pte(vma, address, pte);
+ ret = do_adjust_pte(vma, address, pfn, pte);
spin_unlock(ptl);
pte_unmap_nested(pte);
@@ -127,11 +127,11 @@
if (!(mpnt->vm_flags & VM_MAYSHARE))
continue;
offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT;
- aliases += adjust_pte(mpnt, mpnt->vm_start + offset);
+ aliases += adjust_pte(mpnt, mpnt->vm_start + offset, pfn);
}
flush_dcache_mmap_unlock(mapping);
if (aliases)
- adjust_pte(vma, addr);
+ adjust_pte(vma, addr, pfn);
else
flush_cache_page(vma, addr, pfn);
}
