[MM]: Add set_pte_at() which takes 'mm' and 'addr' args.

I'm taking a slightly different approach this time around so things
are easier to integrate.  Here is the first patch which builds the
infrastructure.  Basically:

1) Add set_pte_at() which is set_pte() with 'mm' and 'addr' arguments
   added.  All generic code uses set_pte_at().

   Most platforms simply get this define:
	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

   I chose this method over simply changing all set_pte() call sites
   because many platforms implement this in assembler and it would
   take forever to preserve the build and stabilize things if modifying
   that was necessary.

   Soon, with platform maintainer's help, we can kill of set_pte() entirely.
   To be honest, there are only a handful of set_pte() call sites in the
   arch specific code.

   Actually, in this patch ppc64 is completely set_pte() free and does not
   define it.

2) pte_clear() gets 'mm' and 'addr' arguments now.
   This had a cascading effect on many ptep_test_and_*() routines.  Specifically:
   a) ptep_test_and_clear_{young,dirty}() now take 'vma' and 'address' args.
   b) ptep_get_and_clear now take 'mm' and 'address' args.
   c) ptep_mkdirty was deleted, unused by any code.
   d) ptep_set_wrprotect now takes 'mm' and 'address' args.

I've tested this patch as follows:

1) compile and run tested on sparc64/SMP
2) compile tested on:
   a) ppc64/SMP
   b) i386 both with and without PAE enabled

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/arm/mm/consistent.c b/arch/arm/mm/consistent.c
index 3c2bde8e357b..36c7961bc1bd 100644
--- a/arch/arm/mm/consistent.c
+++ b/arch/arm/mm/consistent.c
@@ -322,7 +322,7 @@ EXPORT_SYMBOL(dma_mmap_writecombine);
 void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle)
 {
 	struct vm_region *c;
-	unsigned long flags;
+	unsigned long flags, addr;
 	pte_t *ptep;
 
 	size = PAGE_ALIGN(size);
@@ -341,11 +341,13 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
 	}
 
 	ptep = consistent_pte + CONSISTENT_OFFSET(c->vm_start);
+	addr = c->vm_start;
 	do {
-		pte_t pte = ptep_get_and_clear(ptep);
+		pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
 		unsigned long pfn;
 
 		ptep++;
+		addr += PAGE_SIZE;
 
 		if (!pte_none(pte) && pte_present(pte)) {
 			pfn = pte_pfn(pte);