ARC: mm: preps ahead of HIGHMEM support

Before we plug in highmem support, some of code needs to be ready for it
 - copy_user_highpage() needs to be using the kmap_atomic API
 - mk_pte() can't assume page_address()
 - do_page_fault() can't assume VMALLOC_END is end of kernel vaddr space

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

2 files changed, 21 insertions, 8 deletions

diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index ae3b772..521fb2b 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -806,8 +806,8 @@ void flush_anon_page(struct vm_area_struct *vma, struct page *page,
 void copy_user_highpage(struct page *to, struct page *from,
 	unsigned long u_vaddr, struct vm_area_struct *vma)
 {
-	unsigned long kfrom = (unsigned long)page_address(from);
-	unsigned long kto = (unsigned long)page_address(to);
+	void *kfrom = kmap_atomic(from);
+	void *kto = kmap_atomic(to);
 	int clean_src_k_mappings = 0;
 
 	/*
@@ -817,13 +817,16 @@ void copy_user_highpage(struct page *to, struct page *from,
 	 *
 	 * Note that while @u_vaddr refers to DST page's userspace vaddr, it is
 	 * equally valid for SRC page as well
+	 *
+	 * For !VIPT cache, all of this gets compiled out as
+	 * addr_not_cache_congruent() is 0
 	 */
 	if (page_mapped(from) && addr_not_cache_congruent(kfrom, u_vaddr)) {
-		__flush_dcache_page(kfrom, u_vaddr);
+		__flush_dcache_page((unsigned long)kfrom, u_vaddr);
 		clean_src_k_mappings = 1;
 	}
 
-	copy_page((void *)kto, (void *)kfrom);
+	copy_page(kto, kfrom);
 
 	/*
 	 * Mark DST page K-mapping as dirty for a later finalization by
@@ -840,11 +843,14 @@ void copy_user_highpage(struct page *to, struct page *from,
 	 * sync the kernel mapping back to physical page
 	 */
 	if (clean_src_k_mappings) {
-		__flush_dcache_page(kfrom, kfrom);
+		__flush_dcache_page((unsigned long)kfrom, (unsigned long)kfrom);
 		set_bit(PG_dc_clean, &from->flags);
 	} else {
 		clear_bit(PG_dc_clean, &from->flags);
 	}
+
+	kunmap_atomic(kto);
+	kunmap_atomic(kfrom);
 }
 
 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page)
diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
index d948e4e9..af63f4a 100644
--- a/arch/arc/mm/fault.c
+++ b/arch/arc/mm/fault.c
@@ -18,7 +18,14 @@
 #include <asm/pgalloc.h>
 #include <asm/mmu.h>
 
-static int handle_vmalloc_fault(unsigned long address)
+/*
+ * kernel virtual address is required to implement vmalloc/pkmap/fixmap
+ * Refer to asm/processor.h for System Memory Map
+ *
+ * It simply copies the PMD entry (pointer to 2nd level page table or hugepage)
+ * from swapper pgdir to task pgdir. The 2nd level table/page is thus shared
+ */
+noinline static int handle_kernel_vaddr_fault(unsigned long address)
 {
 	/*
 	 * Synchronize this task's top level page-table
@@ -72,8 +79,8 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
 	 * only copy the information from the master page table,
 	 * nothing more.
 	 */
-	if (address >= VMALLOC_START && address <= VMALLOC_END) {
-		ret = handle_vmalloc_fault(address);
+	if (address >= VMALLOC_START) {
+		ret = handle_kernel_vaddr_fault(address);
 		if (unlikely(ret))
 			goto bad_area_nosemaphore;
 		else