[MIPS] Make free_init_pages() arguments to be physical addresses

It allows caller of this function to not care about CKSEG0/XKPHYS
address mixes. It's now automatically done by free_init_pages().

We can now safely remove hack needed by 64 bit kernels with
CONFIG_BUILD_ELF64=n in free_initmem().
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/mm/init.c

@@ -443,15 +443,18 @@ void __init mem_init(void)
 }
 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
 
-void free_init_pages(char *what, unsigned long begin, unsigned long end)
+static void free_init_pages(char *what, unsigned long begin, unsigned long end)
 {
-	unsigned long addr;
+	unsigned long pfn;
 
-	for (addr = begin; addr < end; addr += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page((void *)addr));
-		init_page_count(virt_to_page((void *)addr));
-		memset((void *)addr, 0xcc, PAGE_SIZE);
-		free_page(addr);
+	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
+		struct page *page = pfn_to_page(pfn);
+		void *addr = phys_to_virt(PFN_PHYS(pfn));
+
+		ClearPageReserved(page);
+		init_page_count(page);
+		memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
+		__free_page(page);
 		totalram_pages++;
 	}
 	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
@@ -460,7 +463,9 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_init_pages("initrd memory", start, end);
+	free_init_pages("initrd memory",
+			virt_to_phys((void *)start),
+			virt_to_phys((void *)end));
 }
 #endif
 
@@ -468,17 +473,13 @@ extern unsigned long prom_free_prom_memory(void);
 
 void free_initmem(void)
 {
-	unsigned long start, end, freed;
+	unsigned long freed;
 
 	freed = prom_free_prom_memory();
 	if (freed)
 		printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed);
 
-	start = (unsigned long)(&__init_begin);
-	end = (unsigned long)(&__init_end);
-#ifdef CONFIG_64BIT
-	start = PAGE_OFFSET | CPHYSADDR(start);
-	end = PAGE_OFFSET | CPHYSADDR(end);
-#endif
-	free_init_pages("unused kernel memory", start, end);
+	free_init_pages("unused kernel memory",
+			__pa_symbol(&__init_begin),
+			__pa_symbol(&__init_end));
 }