From b4b7ff4b08e691656c9d77c758fc355833128ac0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 20 Jan 2016 14:01:31 -0300
Subject: Linux-libre 4.4-gnu

---
 arch/s390/mm/mmap.c | 60 ++++++++---------------------------------------------
 1 file changed, 9 insertions(+), 51 deletions(-)

(limited to 'arch/s390/mm/mmap.c')

diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 6e552af08..ea01477b4 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);
-- 
cgit v1.2.3-54-g00ecf