8 files changed, 63 insertions, 13 deletions

diff --git a/lib/Makefile b/lib/Makefile
index 7512dc978f1..0211d2bd5e1 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -10,7 +10,7 @@ endif
 lib-y := ctype.o string.o vsprintf.o cmdline.o \
 	 rbtree.o radix-tree.o dump_stack.o timerqueue.o\
 	 idr.o int_sqrt.o extable.o \
-	 sha1.o md5.o irq_regs.o reciprocal_div.o argv_split.o \
+	 sha1.o md5.o irq_regs.o argv_split.o \
 	 proportions.o flex_proportions.o ratelimit.o show_mem.o \
 	 is_single_threaded.o plist.o decompress.o kobject_uevent.o \
 	 earlycpio.o
@@ -26,7 +26,7 @@ obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
 	 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
 	 gcd.o lcm.o list_sort.o uuid.o flex_array.o iovec.o clz_ctz.o \
 	 bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o kfifo.o \
-	 percpu-refcount.o percpu_ida.o hash.o rhashtable.o
+	 percpu-refcount.o percpu_ida.o hash.o rhashtable.o reciprocal_div.o
 obj-y += string_helpers.o
 obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
 obj-y += kstrtox.o
diff --git a/lib/bitmap.c b/lib/bitmap.c
index cd250a2e14c..b499ab6ada2 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -131,7 +131,9 @@ void __bitmap_shift_right(unsigned long *dst,
 		lower = src[off + k];
 		if (left && off + k == lim - 1)
 			lower &= mask;
-		dst[k] = upper << (BITS_PER_LONG - rem) | lower >> rem;
+		dst[k] = lower >> rem;
+		if (rem)
+			dst[k] |= upper << (BITS_PER_LONG - rem);
 		if (left && k == lim - 1)
 			dst[k] &= mask;
 	}
@@ -172,7 +174,9 @@ void __bitmap_shift_left(unsigned long *dst,
 		upper = src[k];
 		if (left && k == lim - 1)
 			upper &= (1UL << left) - 1;
-		dst[k + off] = lower  >> (BITS_PER_LONG - rem) | upper << rem;
+		dst[k + off] = upper << rem;
+		if (rem)
+			dst[k + off] |= lower >> (BITS_PER_LONG - rem);
 		if (left && k + off == lim - 1)
 			dst[k + off] &= (1UL << left) - 1;
 	}
diff --git a/lib/cmdline.c b/lib/cmdline.c
index 76a712e6e20..8f13cf73c2e 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -160,3 +160,32 @@ unsigned long long memparse(const char *ptr, char **retptr)
 	return ret;
 }
 EXPORT_SYMBOL(memparse);
+
+/**
+ *	parse_option_str - Parse a string and check an option is set or not
+ *	@str: String to be parsed
+ *	@option: option name
+ *
+ *	This function parses a string containing a comma-separated list of
+ *	strings like a=b,c.
+ *
+ *	Return true if there's such option in the string, or return false.
+ */
+bool parse_option_str(const char *str, const char *option)
+{
+	while (*str) {
+		if (!strncmp(str, option, strlen(option))) {
+			str += strlen(option);
+			if (!*str || *str == ',')
+				return true;
+		}
+
+		while (*str && *str != ',')
+			str++;
+
+		if (*str == ',')
+			str++;
+	}
+
+	return false;
+}
diff --git a/lib/genalloc.c b/lib/genalloc.c
index cce4dd68c40..2e65d206b01 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -598,6 +598,7 @@ struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
 
 	return pool;
 }
+EXPORT_SYMBOL(devm_gen_pool_create);
 
 /**
  * dev_get_gen_pool - Obtain the gen_pool (if any) for a device
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 081be3ba9ea..624a0b7c05e 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -230,7 +230,7 @@ int rhashtable_expand(struct rhashtable *ht, gfp_t flags)
 	ht->shift++;
 
 	/* For each new bucket, search the corresponding old bucket
-	 * for the first entry that hashes to the new bucket, and
+	 * for the first entry that hashes to the new bucket, and
 	 * link the new bucket to that entry. Since all the entries
 	 * which will end up in the new bucket appear in the same
 	 * old bucket, this constructs an entirely valid new hash
@@ -248,8 +248,8 @@ int rhashtable_expand(struct rhashtable *ht, gfp_t flags)
 	}
 
 	/* Publish the new table pointer. Lookups may now traverse
-	 * the new table, but they will not benefit from any
-	 * additional efficiency until later steps unzip the buckets.
+	 * the new table, but they will not benefit from any
+	 * additional efficiency until later steps unzip the buckets.
 	 */
 	rcu_assign_pointer(ht->tbl, new_tbl);
 
@@ -306,14 +306,14 @@ int rhashtable_shrink(struct rhashtable *ht, gfp_t flags)
 
 	ht->shift--;
 
-	/* Link each bucket in the new table to the first bucket
+	/* Link each bucket in the new table to the first bucket
 	 * in the old table that contains entries which will hash
 	 * to the new bucket.
 	 */
 	for (i = 0; i < ntbl->size; i++) {
 		ntbl->buckets[i] = tbl->buckets[i];
 
-		/* Link each bucket in the new table to the first bucket
+		/* Link each bucket in the new table to the first bucket
 		 * in the old table that contains entries which will hash
 		 * to the new bucket.
 		 */
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 9cdf62f8acc..c9f2e8c6ccc 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -203,10 +203,10 @@ void __sg_free_table(struct sg_table *table, unsigned int max_ents,
 		}
 
 		table->orig_nents -= sg_size;
-		if (!skip_first_chunk) {
-			free_fn(sgl, alloc_size);
+		if (skip_first_chunk)
 			skip_first_chunk = false;
-		}
+		else
+			free_fn(sgl, alloc_size);
 		sgl = next;
 	}
 
diff --git a/lib/show_mem.c b/lib/show_mem.c
index 09225796991..5e256271b47 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -28,7 +28,7 @@ void show_mem(unsigned int filter)
 				continue;
 
 			total += zone->present_pages;
-			reserved = zone->present_pages - zone->managed_pages;
+			reserved += zone->present_pages - zone->managed_pages;
 
 			if (is_highmem_idx(zoneid))
 				highmem += zone->present_pages;
diff --git a/lib/string.c b/lib/string.c
index 2fc20aa06f8..10063300b83 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -598,6 +598,22 @@ void *memset(void *s, int c, size_t count)
 EXPORT_SYMBOL(memset);
 #endif
 
+/**
+ * memzero_explicit - Fill a region of memory (e.g. sensitive
+ *		      keying data) with 0s.
+ * @s: Pointer to the start of the area.
+ * @count: The size of the area.
+ *
+ * memzero_explicit() doesn't need an arch-specific version as
+ * it just invokes the one of memset() implicitly.
+ */
+void memzero_explicit(void *s, size_t count)
+{
+	memset(s, 0, count);
+	OPTIMIZER_HIDE_VAR(s);
+}
+EXPORT_SYMBOL(memzero_explicit);
+
 #ifndef __HAVE_ARCH_MEMCPY
 /**
  * memcpy - Copy one area of memory to another