Merge tag 'v4.5-rc3' into patchwork

Linux 4.5-rc3

* tag 'v4.5-rc3': (644 commits)
  Linux 4.5-rc3
  epoll: restrict EPOLLEXCLUSIVE to POLLIN and POLLOUT
  radix-tree: fix oops after radix_tree_iter_retry
  MAINTAINERS: trim the file triggers for ABI/API
  dax: dirty inode only if required
  thp: make deferred_split_scan() work again
  mm: replace vma_lock_anon_vma with anon_vma_lock_read/write
  ocfs2/dlm: clear refmap bit of recovery lock while doing local recovery cleanup
  um: asm/page.h: remove the pte_high member from struct pte_t
  mm, hugetlb: don't require CMA for runtime gigantic pages
  mm/hugetlb: fix gigantic page initialization/allocation
  mm: downgrade VM_BUG in isolate_lru_page() to warning
  mempolicy: do not try to queue pages from !vma_migratable()
  mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress
  vmstat: make vmstat_update deferrable
  mm, vmstat: make quiet_vmstat lighter
  mm/Kconfig: correct description of DEFERRED_STRUCT_PAGE_INIT
  memblock: don't mark memblock_phys_mem_size() as __init
  dump_stack: avoid potential deadlocks
  mm: validate_mm browse_rb SMP race condition
  ...

4 files changed, 64 insertions, 24 deletions

diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 547f7f923dbc..519b5a10fd70 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -21,7 +21,7 @@
 #define ODEBUG_HASH_BITS	14
 #define ODEBUG_HASH_SIZE	(1 << ODEBUG_HASH_BITS)
 
-#define ODEBUG_POOL_SIZE	512
+#define ODEBUG_POOL_SIZE	1024
 #define ODEBUG_POOL_MIN_LEVEL	256
 
 #define ODEBUG_CHUNK_SHIFT	PAGE_SHIFT
diff --git a/lib/dump_stack.c b/lib/dump_stack.c
index 6745c6230db3..c30d07e99dba 100644
--- a/lib/dump_stack.c
+++ b/lib/dump_stack.c
@@ -25,6 +25,7 @@ static atomic_t dump_lock = ATOMIC_INIT(-1);
 
 asmlinkage __visible void dump_stack(void)
 {
+	unsigned long flags;
 	int was_locked;
 	int old;
 	int cpu;
@@ -33,9 +34,8 @@ asmlinkage __visible void dump_stack(void)
 	 * Permit this cpu to perform nested stack dumps while serialising
 	 * against other CPUs
 	 */
-	preempt_disable();
-
 retry:
+	local_irq_save(flags);
 	cpu = smp_processor_id();
 	old = atomic_cmpxchg(&dump_lock, -1, cpu);
 	if (old == -1) {
@@ -43,6 +43,7 @@ retry:
 	} else if (old == cpu) {
 		was_locked = 1;
 	} else {
+		local_irq_restore(flags);
 		cpu_relax();
 		goto retry;
 	}
@@ -52,7 +53,7 @@ retry:
 	if (!was_locked)
 		atomic_set(&dump_lock, -1);
 
-	preempt_enable();
+	local_irq_restore(flags);
 }
 #else
 asmlinkage __visible void dump_stack(void)
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index fcf5d98574ce..6b79e9026e24 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -1019,9 +1019,13 @@ radix_tree_gang_lookup(struct radix_tree_root *root, void **results,
 		return 0;
 
 	radix_tree_for_each_slot(slot, root, &iter, first_index) {
-		results[ret] = indirect_to_ptr(rcu_dereference_raw(*slot));
+		results[ret] = rcu_dereference_raw(*slot);
 		if (!results[ret])
 			continue;
+		if (radix_tree_is_indirect_ptr(results[ret])) {
+			slot = radix_tree_iter_retry(&iter);
+			continue;
+		}
 		if (++ret == max_items)
 			break;
 	}
@@ -1098,9 +1102,13 @@ radix_tree_gang_lookup_tag(struct radix_tree_root *root, void **results,
 		return 0;
 
 	radix_tree_for_each_tagged(slot, root, &iter, first_index, tag) {
-		results[ret] = indirect_to_ptr(rcu_dereference_raw(*slot));
+		results[ret] = rcu_dereference_raw(*slot);
 		if (!results[ret])
 			continue;
+		if (radix_tree_is_indirect_ptr(results[ret])) {
+			slot = radix_tree_iter_retry(&iter);
+			continue;
+		}
 		if (++ret == max_items)
 			break;
 	}
diff --git a/lib/test-string_helpers.c b/lib/test-string_helpers.c
index 98866a770770..25b5cbfb7615 100644
--- a/lib/test-string_helpers.c
+++ b/lib/test-string_helpers.c
@@ -327,36 +327,67 @@ out:
 }
 
 #define string_get_size_maxbuf 16
-#define test_string_get_size_one(size, blk_size, units, exp_result)            \
+#define test_string_get_size_one(size, blk_size, exp_result10, exp_result2)    \
 	do {                                                                   \
-		BUILD_BUG_ON(sizeof(exp_result) >= string_get_size_maxbuf);    \
-		__test_string_get_size((size), (blk_size), (units),            \
-				       (exp_result));                          \
+		BUILD_BUG_ON(sizeof(exp_result10) >= string_get_size_maxbuf);  \
+		BUILD_BUG_ON(sizeof(exp_result2) >= string_get_size_maxbuf);   \
+		__test_string_get_size((size), (blk_size), (exp_result10),     \
+				       (exp_result2));                         \
 	} while (0)
 
 
-static __init void __test_string_get_size(const u64 size, const u64 blk_size,
-					  const enum string_size_units units,
-					  const char *exp_result)
+static __init void test_string_get_size_check(const char *units,
+					      const char *exp,
+					      char *res,
+					      const u64 size,
+					      const u64 blk_size)
 {
-	char buf[string_get_size_maxbuf];
-
-	string_get_size(size, blk_size, units, buf, sizeof(buf));
-	if (!memcmp(buf, exp_result, strlen(exp_result) + 1))
+	if (!memcmp(res, exp, strlen(exp) + 1))
 		return;
 
-	buf[sizeof(buf) - 1] = '\0';
-	pr_warn("Test 'test_string_get_size_one' failed!\n");
-	pr_warn("string_get_size(size = %llu, blk_size = %llu, units = %d\n",
+	res[string_get_size_maxbuf - 1] = '\0';
+
+	pr_warn("Test 'test_string_get_size' failed!\n");
+	pr_warn("string_get_size(size = %llu, blk_size = %llu, units = %s)\n",
 		size, blk_size, units);
-	pr_warn("expected: '%s', got '%s'\n", exp_result, buf);
+	pr_warn("expected: '%s', got '%s'\n", exp, res);
+}
+
+static __init void __test_string_get_size(const u64 size, const u64 blk_size,
+					  const char *exp_result10,
+					  const char *exp_result2)
+{
+	char buf10[string_get_size_maxbuf];
+	char buf2[string_get_size_maxbuf];
+
+	string_get_size(size, blk_size, STRING_UNITS_10, buf10, sizeof(buf10));
+	string_get_size(size, blk_size, STRING_UNITS_2, buf2, sizeof(buf2));
+
+	test_string_get_size_check("STRING_UNITS_10", exp_result10, buf10,
+				   size, blk_size);
+
+	test_string_get_size_check("STRING_UNITS_2", exp_result2, buf2,
+				   size, blk_size);
 }
 
 static __init void test_string_get_size(void)
 {
-	test_string_get_size_one(16384, 512, STRING_UNITS_2, "8.00 MiB");
-	test_string_get_size_one(8192, 4096, STRING_UNITS_10, "32.7 MB");
-	test_string_get_size_one(1, 512, STRING_UNITS_10, "512 B");
+	/* small values */
+	test_string_get_size_one(0, 512, "0 B", "0 B");
+	test_string_get_size_one(1, 512, "512 B", "512 B");
+	test_string_get_size_one(1100, 1, "1.10 kB", "1.07 KiB");
+
+	/* normal values */
+	test_string_get_size_one(16384, 512, "8.39 MB", "8.00 MiB");
+	test_string_get_size_one(500118192, 512, "256 GB", "238 GiB");
+	test_string_get_size_one(8192, 4096, "33.6 MB", "32.0 MiB");
+
+	/* weird block sizes */
+	test_string_get_size_one(3000, 1900, "5.70 MB", "5.44 MiB");
+
+	/* huge values */
+	test_string_get_size_one(U64_MAX, 4096, "75.6 ZB", "64.0 ZiB");
+	test_string_get_size_one(4096, U64_MAX, "75.6 ZB", "64.0 ZiB");
 }
 
 static int __init test_string_helpers_init(void)