1 files changed, 13 insertions, 69 deletions

diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index ca2d537e25b1..b2cdbb8a12b1 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -27,17 +27,12 @@
 #include <linux/elf-randomize.h>
 
 /*
- * Construct an artificial page offset for the mapping based on the virtual
+ * Construct an artificial page offset for the mapping based on the physical
  * address of the kernel file mapping variable.
- * If filp is zero the calculated pgoff value aliases the memory of the given
- * address. This is useful for io_uring where the mapping shall alias a kernel
- * address and a userspace adress where both the kernel and the userspace
- * access the same memory region.
  */
-#define GET_FILP_PGOFF(filp, addr)		\
-	((filp ? (((unsigned long) filp->f_mapping) >> 8)	\
-		 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)	\
-	  + (addr >> PAGE_SHIFT))
+#define GET_FILP_PGOFF(filp)		\
+	(filp ? (((unsigned long) filp->f_mapping) >> 8)	\
+		 & ((SHM_COLOUR-1) >> PAGE_SHIFT) : 0UL)
 
 static unsigned long shared_align_offset(unsigned long filp_pgoff,
 					 unsigned long pgoff)
@@ -82,7 +77,7 @@ unsigned long calc_max_stack_size(unsigned long stack_max)
  * indicating that "current" should be used instead of a passed-in
  * value from the exec bprm as done with arch_pick_mmap_layout().
  */
-static unsigned long mmap_upper_limit(struct rlimit *rlim_stack)
+unsigned long mmap_upper_limit(const struct rlimit *rlim_stack)
 {
 	unsigned long stack_base;
 
@@ -109,7 +104,9 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
 	struct vm_area_struct *vma, *prev;
 	unsigned long filp_pgoff;
 	int do_color_align;
-	struct vm_unmapped_area_info info;
+	struct vm_unmapped_area_info info = {
+		.length = len
+	};
 
 	if (unlikely(len > TASK_SIZE))
 		return -ENOMEM;
@@ -117,7 +114,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
 	do_color_align = 0;
 	if (filp || (flags & MAP_SHARED))
 		do_color_align = 1;
-	filp_pgoff = GET_FILP_PGOFF(filp, addr);
+	filp_pgoff = GET_FILP_PGOFF(filp);
 
 	if (flags & MAP_FIXED) {
 		/* Even MAP_FIXED mappings must reside within TASK_SIZE */
@@ -144,7 +141,6 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
 			return addr;
 	}
 
-	info.length = len;
 	info.align_mask = do_color_align ? (PAGE_MASK & (SHM_COLOUR - 1)) : 0;
 	info.align_offset = shared_align_offset(filp_pgoff, pgoff);
 
@@ -165,14 +161,14 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
 		 */
 	}
 
-	info.flags = 0;
-	info.low_limit = mm->mmap_legacy_base;
+	info.low_limit = mm->mmap_base;
 	info.high_limit = mmap_upper_limit(NULL);
 	return vm_unmapped_area(&info);
 }
 
 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
-	unsigned long len, unsigned long pgoff, unsigned long flags)
+	unsigned long len, unsigned long pgoff, unsigned long flags,
+	vm_flags_t vm_flags)
 {
 	return arch_get_unmapped_area_common(filp,
 			addr, len, pgoff, flags, UP);
@@ -180,64 +176,12 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 
 unsigned long arch_get_unmapped_area_topdown(struct file *filp,
 	unsigned long addr, unsigned long len, unsigned long pgoff,
-	unsigned long flags)
+	unsigned long flags, vm_flags_t vm_flags)
 {
 	return arch_get_unmapped_area_common(filp,
 			addr, len, pgoff, flags, DOWN);
 }
 
-static int mmap_is_legacy(void)
-{
-	if (current->personality & ADDR_COMPAT_LAYOUT)
-		return 1;
-
-	/* parisc stack always grows up - so a unlimited stack should
-	 * not be an indicator to use the legacy memory layout.
-	 * if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
-	 *	return 1;
-	 */
-
-	return sysctl_legacy_va_layout;
-}
-
-static unsigned long mmap_rnd(void)
-{
-	unsigned long rnd = 0;
-
-	if (current->flags & PF_RANDOMIZE)
-		rnd = get_random_u32() & MMAP_RND_MASK;
-
-	return rnd << PAGE_SHIFT;
-}
-
-unsigned long arch_mmap_rnd(void)
-{
-	return (get_random_u32() & MMAP_RND_MASK) << PAGE_SHIFT;
-}
-
-static unsigned long mmap_legacy_base(void)
-{
-	return TASK_UNMAPPED_BASE + mmap_rnd();
-}
-
-/*
- * This function, called very early during the creation of a new
- * process VM image, sets up which VM layout function to use:
- */
-void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
-{
-	mm->mmap_legacy_base = mmap_legacy_base();
-	mm->mmap_base = mmap_upper_limit(rlim_stack);
-
-	if (mmap_is_legacy()) {
-		mm->mmap_base = mm->mmap_legacy_base;
-		mm->get_unmapped_area = arch_get_unmapped_area;
-	} else {
-		mm->get_unmapped_area = arch_get_unmapped_area_topdown;
-	}
-}
-
-
 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
 	unsigned long prot, unsigned long flags, unsigned long fd,
 	unsigned long pgoff)