2 files changed, 12 insertions, 78 deletions

diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index c3c07d3505ba..c722400c7697 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -48,37 +48,13 @@ EXPORT_SYMBOL(zero_page_mask);
 
 static void __init setup_zero_pages(void)
 {
-	struct cpuid cpu_id;
 	unsigned int order;
 	struct page *page;
 	int i;
 
-	get_cpu_id(&cpu_id);
-	switch (cpu_id.machine) {
-	case 0x9672:	/* g5 */
-	case 0x2064:	/* z900 */
-	case 0x2066:	/* z900 */
-	case 0x2084:	/* z990 */
-	case 0x2086:	/* z990 */
-	case 0x2094:	/* z9-109 */
-	case 0x2096:	/* z9-109 */
-		order = 0;
-		break;
-	case 0x2097:	/* z10 */
-	case 0x2098:	/* z10 */
-	case 0x2817:	/* z196 */
-	case 0x2818:	/* z196 */
-		order = 2;
-		break;
-	case 0x2827:	/* zEC12 */
-	case 0x2828:	/* zEC12 */
-		order = 5;
-		break;
-	case 0x2964:	/* z13 */
-	default:
-		order = 7;
-		break;
-	}
+	/* Latest machines require a mapping granularity of 512KB */
+	order = 7;
+
 	/* Limit number of empty zero pages for small memory sizes */
 	while (order > 2 && (totalram_pages >> 10) < (1UL << order))
 		order--;
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 6e552af08c76..ea01477b4aa6 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -31,9 +31,6 @@
 #include <linux/security.h>
 #include <asm/pgalloc.h>
 
-unsigned long mmap_rnd_mask;
-static unsigned long mmap_align_mask;
-
 static unsigned long stack_maxrandom_size(void)
 {
 	if (!(current->flags & PF_RANDOMIZE))
@@ -62,10 +59,7 @@ static inline int mmap_is_legacy(void)
 
 unsigned long arch_mmap_rnd(void)
 {
-	if (is_32bit_task())
-		return (get_random_int() & 0x7ff) << PAGE_SHIFT;
-	else
-		return (get_random_int() & mmap_rnd_mask) << PAGE_SHIFT;
+	return (get_random_int() & MMAP_RND_MASK) << PAGE_SHIFT;
 }
 
 static unsigned long mmap_base_legacy(unsigned long rnd)
@@ -92,7 +86,6 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
 	struct mm_struct *mm = current->mm;
 	struct vm_area_struct *vma;
 	struct vm_unmapped_area_info info;
-	int do_color_align;
 
 	if (len > TASK_SIZE - mmap_min_addr)
 		return -ENOMEM;
@@ -108,15 +101,14 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
 			return addr;
 	}
 
-	do_color_align = 0;
-	if (filp || (flags & MAP_SHARED))
-		do_color_align = !is_32bit_task();
-
 	info.flags = 0;
 	info.length = len;
 	info.low_limit = mm->mmap_base;
 	info.high_limit = TASK_SIZE;
-	info.align_mask = do_color_align ? (mmap_align_mask << PAGE_SHIFT) : 0;
+	if (filp || (flags & MAP_SHARED))
+		info.align_mask = MMAP_ALIGN_MASK << PAGE_SHIFT;
+	else
+		info.align_mask = 0;
 	info.align_offset = pgoff << PAGE_SHIFT;
 	return vm_unmapped_area(&info);
 }
@@ -130,7 +122,6 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 	struct mm_struct *mm = current->mm;
 	unsigned long addr = addr0;
 	struct vm_unmapped_area_info info;
-	int do_color_align;
 
 	/* requested length too big for entire address space */
 	if (len > TASK_SIZE - mmap_min_addr)
@@ -148,15 +139,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 			return addr;
 	}
 
-	do_color_align = 0;
-	if (filp || (flags & MAP_SHARED))
-		do_color_align = !is_32bit_task();
-
 	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
 	info.length = len;
 	info.low_limit = max(PAGE_SIZE, mmap_min_addr);
 	info.high_limit = mm->mmap_base;
-	info.align_mask = do_color_align ? (mmap_align_mask << PAGE_SHIFT) : 0;
+	if (filp || (flags & MAP_SHARED))
+		info.align_mask = MMAP_ALIGN_MASK << PAGE_SHIFT;
+	else
+		info.align_mask = 0;
 	info.align_offset = pgoff << PAGE_SHIFT;
 	addr = vm_unmapped_area(&info);
 
@@ -254,35 +244,3 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
 		mm->get_unmapped_area = s390_get_unmapped_area_topdown;
 	}
 }
-
-static int __init setup_mmap_rnd(void)
-{
-	struct cpuid cpu_id;
-
-	get_cpu_id(&cpu_id);
-	switch (cpu_id.machine) {
-	case 0x9672:
-	case 0x2064:
-	case 0x2066:
-	case 0x2084:
-	case 0x2086:
-	case 0x2094:
-	case 0x2096:
-	case 0x2097:
-	case 0x2098:
-	case 0x2817:
-	case 0x2818:
-	case 0x2827:
-	case 0x2828:
-		mmap_rnd_mask = 0x7ffUL;
-		mmap_align_mask = 0UL;
-		break;
-	case 0x2964:	/* z13 */
-	default:
-		mmap_rnd_mask = 0x3ff80UL;
-		mmap_align_mask = 0x7fUL;
-		break;
-	}
-	return 0;
-}
-early_initcall(setup_mmap_rnd);