These changes are the raw update to linux-4.4.6-rt14. Kernel sources

are taken from kernel.org, and rt patch from the rt wiki download page.

During the rebasing, the following patch collided:

Force tick interrupt and get rid of softirq magic(I70131fb85).

Collisions have been removed because its logic was found on the
source already.

Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>

1 files changed, 45 insertions, 116 deletions

diff --git a/kernel/mm/nommu.c b/kernel/mm/nommu.c
index e544508e2..92be862c8 100644
--- a/kernel/mm/nommu.c
+++ b/kernel/mm/nommu.c
@@ -42,22 +42,6 @@
 #include <asm/mmu_context.h>
 #include "internal.h"
 
-#if 0
-#define kenter(FMT, ...) \
-	printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
-#define kleave(FMT, ...) \
-	printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
-#define kdebug(FMT, ...) \
-	printk(KERN_DEBUG "xxx" FMT"yyy\n", ##__VA_ARGS__)
-#else
-#define kenter(FMT, ...) \
-	no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
-#define kleave(FMT, ...) \
-	no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
-#define kdebug(FMT, ...) \
-	no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
-#endif
-
 void *high_memory;
 EXPORT_SYMBOL(high_memory);
 struct page *mem_map;
@@ -340,12 +324,12 @@ long vwrite(char *buf, char *addr, unsigned long count)
 }
 
 /*
- *	vmalloc  -  allocate virtually continguos memory
+ *	vmalloc  -  allocate virtually contiguous memory
  *
  *	@size:		allocation size
  *
  *	Allocate enough pages to cover @size from the page level
- *	allocator and map them into continguos kernel virtual space.
+ *	allocator and map them into contiguous kernel virtual space.
  *
  *	For tight control over page level allocator and protection flags
  *	use __vmalloc() instead.
@@ -357,12 +341,12 @@ void *vmalloc(unsigned long size)
 EXPORT_SYMBOL(vmalloc);
 
 /*
- *	vzalloc - allocate virtually continguos memory with zero fill
+ *	vzalloc - allocate virtually contiguous memory with zero fill
  *
  *	@size:		allocation size
  *
  *	Allocate enough pages to cover @size from the page level
- *	allocator and map them into continguos kernel virtual space.
+ *	allocator and map them into contiguous kernel virtual space.
  *	The memory allocated is set to zero.
  *
  *	For tight control over page level allocator and protection flags
@@ -436,7 +420,7 @@ void *vmalloc_exec(unsigned long size)
  *	@size:		allocation size
  *
  *	Allocate enough 32bit PA addressable pages to cover @size from the
- *	page level allocator and map them into continguos kernel virtual space.
+ *	page level allocator and map them into contiguous kernel virtual space.
  */
 void *vmalloc_32(unsigned long size)
 {
@@ -594,16 +578,16 @@ static noinline void validate_nommu_regions(void)
 		return;
 
 	last = rb_entry(lastp, struct vm_region, vm_rb);
-	BUG_ON(unlikely(last->vm_end <= last->vm_start));
-	BUG_ON(unlikely(last->vm_top < last->vm_end));
+	BUG_ON(last->vm_end <= last->vm_start);
+	BUG_ON(last->vm_top < last->vm_end);
 
 	while ((p = rb_next(lastp))) {
 		region = rb_entry(p, struct vm_region, vm_rb);
 		last = rb_entry(lastp, struct vm_region, vm_rb);
 
-		BUG_ON(unlikely(region->vm_end <= region->vm_start));
-		BUG_ON(unlikely(region->vm_top < region->vm_end));
-		BUG_ON(unlikely(region->vm_start < last->vm_top));
+		BUG_ON(region->vm_end <= region->vm_start);
+		BUG_ON(region->vm_top < region->vm_end);
+		BUG_ON(region->vm_start < last->vm_top);
 
 		lastp = p;
 	}
@@ -665,11 +649,7 @@ static void free_page_series(unsigned long from, unsigned long to)
 	for (; from < to; from += PAGE_SIZE) {
 		struct page *page = virt_to_page(from);
 
-		kdebug("- free %lx", from);
 		atomic_long_dec(&mmap_pages_allocated);
-		if (page_count(page) != 1)
-			kdebug("free page %p: refcount not one: %d",
-			       page, page_count(page));
 		put_page(page);
 	}
 }
@@ -683,8 +663,6 @@ static void free_page_series(unsigned long from, unsigned long to)
 static void __put_nommu_region(struct vm_region *region)
 	__releases(nommu_region_sem)
 {
-	kenter("%p{%d}", region, region->vm_usage);
-
 	BUG_ON(!nommu_region_tree.rb_node);
 
 	if (--region->vm_usage == 0) {
@@ -697,10 +675,8 @@ static void __put_nommu_region(struct vm_region *region)
 
 		/* IO memory and memory shared directly out of the pagecache
 		 * from ramfs/tmpfs mustn't be released here */
-		if (region->vm_flags & VM_MAPPED_COPY) {
-			kdebug("free series");
+		if (region->vm_flags & VM_MAPPED_COPY)
 			free_page_series(region->vm_start, region->vm_top);
-		}
 		kmem_cache_free(vm_region_jar, region);
 	} else {
 		up_write(&nommu_region_sem);
@@ -744,8 +720,6 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
 	struct address_space *mapping;
 	struct rb_node **p, *parent, *rb_prev;
 
-	kenter(",%p", vma);
-
 	BUG_ON(!vma->vm_region);
 
 	mm->map_count++;
@@ -813,8 +787,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
 	struct mm_struct *mm = vma->vm_mm;
 	struct task_struct *curr = current;
 
-	kenter("%p", vma);
-
 	protect_vma(vma, 0);
 
 	mm->map_count--;
@@ -854,7 +826,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
  */
 static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma)
 {
-	kenter("%p", vma);
 	if (vma->vm_ops && vma->vm_ops->close)
 		vma->vm_ops->close(vma);
 	if (vma->vm_file)
@@ -957,12 +928,8 @@ static int validate_mmap_request(struct file *file,
 	int ret;
 
 	/* do the simple checks first */
-	if (flags & MAP_FIXED) {
-		printk(KERN_DEBUG
-		       "%d: Can't do fixed-address/overlay mmap of RAM\n",
-		       current->pid);
+	if (flags & MAP_FIXED)
 		return -EINVAL;
-	}
 
 	if ((flags & MAP_TYPE) != MAP_PRIVATE &&
 	    (flags & MAP_TYPE) != MAP_SHARED)
@@ -1060,8 +1027,7 @@ static int validate_mmap_request(struct file *file,
 			    ) {
 				capabilities &= ~NOMMU_MAP_DIRECT;
 				if (flags & MAP_SHARED) {
-					printk(KERN_WARNING
-					       "MAP_SHARED not completely supported on !MMU\n");
+					pr_warn("MAP_SHARED not completely supported on !MMU\n");
 					return -EINVAL;
 				}
 			}
@@ -1069,7 +1035,7 @@ static int validate_mmap_request(struct file *file,
 
 		/* handle executable mappings and implied executable
 		 * mappings */
-		if (file->f_path.mnt->mnt_flags & MNT_NOEXEC) {
+		if (path_noexec(&file->f_path)) {
 			if (prot & PROT_EXEC)
 				return -EPERM;
 		} else if ((prot & PROT_READ) && !(prot & PROT_EXEC)) {
@@ -1205,16 +1171,12 @@ static int do_mmap_private(struct vm_area_struct *vma,
 	 *   we're allocating is smaller than a page
 	 */
 	order = get_order(len);
-	kdebug("alloc order %d for %lx", order, len);
-
 	total = 1 << order;
 	point = len >> PAGE_SHIFT;
 
 	/* we don't want to allocate a power-of-2 sized page set */
-	if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) {
+	if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages)
 		total = point;
-		kdebug("try to alloc exact %lu pages", total);
-	}
 
 	base = alloc_pages_exact(total << PAGE_SHIFT, GFP_KERNEL);
 	if (!base)
@@ -1271,32 +1233,29 @@ enomem:
 /*
  * handle mapping creation for uClinux
  */
-unsigned long do_mmap_pgoff(struct file *file,
-			    unsigned long addr,
-			    unsigned long len,
-			    unsigned long prot,
-			    unsigned long flags,
-			    unsigned long pgoff,
-			    unsigned long *populate)
+unsigned long do_mmap(struct file *file,
+			unsigned long addr,
+			unsigned long len,
+			unsigned long prot,
+			unsigned long flags,
+			vm_flags_t vm_flags,
+			unsigned long pgoff,
+			unsigned long *populate)
 {
 	struct vm_area_struct *vma;
 	struct vm_region *region;
 	struct rb_node *rb;
-	unsigned long capabilities, vm_flags, result;
+	unsigned long capabilities, result;
 	int ret;
 
-	kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff);
-
 	*populate = 0;
 
 	/* decide whether we should attempt the mapping, and if so what sort of
 	 * mapping */
 	ret = validate_mmap_request(file, addr, len, prot, flags, pgoff,
 				    &capabilities);
-	if (ret < 0) {
-		kleave(" = %d [val]", ret);
+	if (ret < 0)
 		return ret;
-	}
 
 	/* we ignore the address hint */
 	addr = 0;
@@ -1304,7 +1263,7 @@ unsigned long do_mmap_pgoff(struct file *file,
 
 	/* we've determined that we can make the mapping, now translate what we
 	 * now know into VMA flags */
-	vm_flags = determine_vm_flags(file, prot, flags, capabilities);
+	vm_flags |= determine_vm_flags(file, prot, flags, capabilities);
 
 	/* we're going to need to record the mapping */
 	region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL);
@@ -1383,11 +1342,9 @@ unsigned long do_mmap_pgoff(struct file *file,
 			vma->vm_start = start;
 			vma->vm_end = start + len;
 
-			if (pregion->vm_flags & VM_MAPPED_COPY) {
-				kdebug("share copy");
+			if (pregion->vm_flags & VM_MAPPED_COPY)
 				vma->vm_flags |= VM_MAPPED_COPY;
-			} else {
-				kdebug("share mmap");
+			else {
 				ret = do_mmap_shared_file(vma);
 				if (ret < 0) {
 					vma->vm_region = NULL;
@@ -1467,7 +1424,6 @@ share:
 
 	up_write(&nommu_region_sem);
 
-	kleave(" = %lx", result);
 	return result;
 
 error_just_free:
@@ -1479,27 +1435,24 @@ error:
 	if (vma->vm_file)
 		fput(vma->vm_file);
 	kmem_cache_free(vm_area_cachep, vma);
-	kleave(" = %d", ret);
 	return ret;
 
 sharing_violation:
 	up_write(&nommu_region_sem);
-	printk(KERN_WARNING "Attempt to share mismatched mappings\n");
+	pr_warn("Attempt to share mismatched mappings\n");
 	ret = -EINVAL;
 	goto error;
 
 error_getting_vma:
 	kmem_cache_free(vm_region_jar, region);
-	printk(KERN_WARNING "Allocation of vma for %lu byte allocation"
-	       " from process %d failed\n",
-	       len, current->pid);
+	pr_warn("Allocation of vma for %lu byte allocation from process %d failed\n",
+			len, current->pid);
 	show_free_areas(0);
 	return -ENOMEM;
 
 error_getting_region:
-	printk(KERN_WARNING "Allocation of vm region for %lu byte allocation"
-	       " from process %d failed\n",
-	       len, current->pid);
+	pr_warn("Allocation of vm region for %lu byte allocation from process %d failed\n",
+			len, current->pid);
 	show_free_areas(0);
 	return -ENOMEM;
 }
@@ -1544,7 +1497,7 @@ SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg)
 
 	if (copy_from_user(&a, arg, sizeof(a)))
 		return -EFAULT;
-	if (a.offset & ~PAGE_MASK)
+	if (offset_in_page(a.offset))
 		return -EINVAL;
 
 	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
@@ -1563,8 +1516,6 @@ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma,
 	struct vm_region *region;
 	unsigned long npages;
 
-	kenter("");
-
 	/* we're only permitted to split anonymous regions (these should have
 	 * only a single usage on the region) */
 	if (vma->vm_file)
@@ -1628,8 +1579,6 @@ static int shrink_vma(struct mm_struct *mm,
 {
 	struct vm_region *region;
 
-	kenter("");
-
 	/* adjust the VMA's pointers, which may reposition it in the MM's tree
 	 * and list */
 	delete_vma_from_mm(vma);
@@ -1669,8 +1618,6 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 	unsigned long end;
 	int ret;
 
-	kenter(",%lx,%zx", start, len);
-
 	len = PAGE_ALIGN(len);
 	if (len == 0)
 		return -EINVAL;
@@ -1682,11 +1629,9 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 	if (!vma) {
 		static int limit;
 		if (limit < 5) {
-			printk(KERN_WARNING
-			       "munmap of memory not mmapped by process %d"
-			       " (%s): 0x%lx-0x%lx\n",
-			       current->pid, current->comm,
-			       start, start + len - 1);
+			pr_warn("munmap of memory not mmapped by process %d (%s): 0x%lx-0x%lx\n",
+					current->pid, current->comm,
+					start, start + len - 1);
 			limit++;
 		}
 		return -EINVAL;
@@ -1695,38 +1640,27 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 	/* we're allowed to split an anonymous VMA but not a file-backed one */
 	if (vma->vm_file) {
 		do {
-			if (start > vma->vm_start) {
-				kleave(" = -EINVAL [miss]");
+			if (start > vma->vm_start)
 				return -EINVAL;
-			}
 			if (end == vma->vm_end)
 				goto erase_whole_vma;
 			vma = vma->vm_next;
 		} while (vma);
-		kleave(" = -EINVAL [split file]");
 		return -EINVAL;
 	} else {
 		/* the chunk must be a subset of the VMA found */
 		if (start == vma->vm_start && end == vma->vm_end)
 			goto erase_whole_vma;
-		if (start < vma->vm_start || end > vma->vm_end) {
-			kleave(" = -EINVAL [superset]");
+		if (start < vma->vm_start || end > vma->vm_end)
 			return -EINVAL;
-		}
-		if (start & ~PAGE_MASK) {
-			kleave(" = -EINVAL [unaligned start]");
+		if (offset_in_page(start))
 			return -EINVAL;
-		}
-		if (end != vma->vm_end && end & ~PAGE_MASK) {
-			kleave(" = -EINVAL [unaligned split]");
+		if (end != vma->vm_end && offset_in_page(end))
 			return -EINVAL;
-		}
 		if (start != vma->vm_start && end != vma->vm_end) {
 			ret = split_vma(mm, vma, start, 1);
-			if (ret < 0) {
-				kleave(" = %d [split]", ret);
+			if (ret < 0)
 				return ret;
-			}
 		}
 		return shrink_vma(mm, vma, start, end);
 	}
@@ -1734,7 +1668,6 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 erase_whole_vma:
 	delete_vma_from_mm(vma);
 	delete_vma(mm, vma);
-	kleave(" = 0");
 	return 0;
 }
 EXPORT_SYMBOL(do_munmap);
@@ -1766,8 +1699,6 @@ void exit_mmap(struct mm_struct *mm)
 	if (!mm)
 		return;
 
-	kenter("");
-
 	mm->total_vm = 0;
 
 	while ((vma = mm->mmap)) {
@@ -1776,8 +1707,6 @@ void exit_mmap(struct mm_struct *mm)
 		delete_vma(mm, vma);
 		cond_resched();
 	}
-
-	kleave("");
 }
 
 unsigned long vm_brk(unsigned long addr, unsigned long len)
@@ -1807,7 +1736,7 @@ static unsigned long do_mremap(unsigned long addr,
 	if (old_len == 0 || new_len == 0)
 		return (unsigned long) -EINVAL;
 
-	if (addr & ~PAGE_MASK)
+	if (offset_in_page(addr))
 		return -EINVAL;
 
 	if (flags & MREMAP_FIXED && new_addr != addr)
@@ -2157,7 +2086,7 @@ static int __meminit init_user_reserve(void)
 	sysctl_user_reserve_kbytes = min(free_kbytes / 32, 1UL << 17);
 	return 0;
 }
-module_init(init_user_reserve)
+subsys_initcall(init_user_reserve);
 
 /*
  * Initialise sysctl_admin_reserve_kbytes.
@@ -2178,4 +2107,4 @@ static int __meminit init_admin_reserve(void)
 	sysctl_admin_reserve_kbytes = min(free_kbytes / 32, 1UL << 13);
 	return 0;
 }
-module_init(init_admin_reserve)
+subsys_initcall(init_admin_reserve);