diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f2a93c8679e8..8cd78cc87a1c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -834,12 +834,15 @@
 			See also Documentation/networking/decnet.txt.
 
 	default_hugepagesz=
-			[same as hugepagesz=] The size of the default
-			HugeTLB page size. This is the size represented by
-			the legacy /proc/ hugepages APIs, used for SHM, and
-			default size when mounting hugetlbfs filesystems.
-			Defaults to the default architecture's huge page size
-			if not specified.
+			[HW] The size of the default HugeTLB page. This is
+			the size represented by the legacy /proc/ hugepages
+			APIs.  In addition, this is the default hugetlb size
+			used for shmget(), mmap() and mounting hugetlbfs
+			filesystems.  If not specified, defaults to the
+			architecture's default huge page size.  Huge page
+			sizes are architecture dependent.  See also
+			Documentation/admin-guide/mm/hugetlbpage.rst.
+			Format: size[KMG]
 
 	deferred_probe_timeout=
 			[KNL] Debugging option to set a timeout in seconds for
@@ -1479,13 +1482,24 @@
 			hugepages using the cma allocator. If enabled, the
 			boot-time allocation of gigantic hugepages is skipped.
 
-	hugepages=	[HW,X86-32,IA-64] HugeTLB pages to allocate at boot.
-	hugepagesz=	[HW,IA-64,PPC,X86-64] The size of the HugeTLB pages.
-			On x86-64 and powerpc, this option can be specified
-			multiple times interleaved with hugepages= to reserve
-			huge pages of different sizes. Valid pages sizes on
-			x86-64 are 2M (when the CPU supports "pse") and 1G
-			(when the CPU supports the "pdpe1gb" cpuinfo flag).
+	hugepages=	[HW] Number of HugeTLB pages to allocate at boot.
+			If this follows hugepagesz (below), it specifies
+			the number of pages of hugepagesz to be allocated.
+			If this is the first HugeTLB parameter on the command
+			line, it specifies the number of pages to allocate for
+			the default huge page size.  See also
+			Documentation/admin-guide/mm/hugetlbpage.rst.
+			Format: <integer>
+
+	hugepagesz=
+			[HW] The size of the HugeTLB pages.  This is used in
+			conjunction with hugepages (above) to allocate huge
+			pages of a specific size at boot.  The pair
+			hugepagesz=X hugepages=Y can be specified once for
+			each supported huge page size. Huge page sizes are
+			architecture dependent.  See also
+			Documentation/admin-guide/mm/hugetlbpage.rst.
+			Format: size[KMG]
 
 	hung_task_panic=
 			[KNL] Should the hung task detector generate panics.
diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst
index 1cc0bc78d10e..5026e58826e2 100644
--- a/Documentation/admin-guide/mm/hugetlbpage.rst
+++ b/Documentation/admin-guide/mm/hugetlbpage.rst
@@ -100,6 +100,41 @@ with a huge page size selection parameter "hugepagesz=<size>".  <size> must
 be specified in bytes with optional scale suffix [kKmMgG].  The default huge
 page size may be selected with the "default_hugepagesz=<size>" boot parameter.
 
+Hugetlb boot command line parameter semantics
+hugepagesz - Specify a huge page size.  Used in conjunction with hugepages
+	parameter to preallocate a number of huge pages of the specified
+	size.  Hence, hugepagesz and hugepages are typically specified in
+	pairs such as:
+		hugepagesz=2M hugepages=512
+	hugepagesz can only be specified once on the command line for a
+	specific huge page size.  Valid huge page sizes are architecture
+	dependent.
+hugepages - Specify the number of huge pages to preallocate.  This typically
+	follows a valid hugepagesz or default_hugepagesz parameter.  However,
+	if hugepages is the first or only hugetlb command line parameter it
+	implicitly specifies the number of huge pages of default size to
+	allocate.  If the number of huge pages of default size is implicitly
+	specified, it can not be overwritten by a hugepagesz,hugepages
+	parameter pair for the default size.
+	For example, on an architecture with 2M default huge page size:
+		hugepages=256 hugepagesz=2M hugepages=512
+	will result in 256 2M huge pages being allocated and a warning message
+	indicating that the hugepages=512 parameter is ignored.  If a hugepages
+	parameter is preceded by an invalid hugepagesz parameter, it will
+	be ignored.
+default_hugepagesz - Specify the default huge page size.  This parameter can
+	only be specified once on the command line.  default_hugepagesz can
+	optionally be followed by the hugepages parameter to preallocate a
+	specific number of huge pages of default size.  The number of default
+	sized huge pages to preallocate can also be implicitly specified as
+	mentioned in the hugepages section above.  Therefore, on an
+	architecture with 2M default huge page size:
+		hugepages=256
+		default_hugepagesz=2M hugepages=256
+		hugepages=256 default_hugepagesz=2M
+	will all result in 256 2M huge pages being allocated.  Valid default
+	huge page size is architecture dependent.
+
 When multiple huge page sizes are supported, ``/proc/sys/vm/nr_hugepages``
 indicates the current number of pre-allocated huge pages of the default size.
 Thus, one can use the following command to dynamically allocate/deallocate
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 0e6eb755ae94..e272ebc2b5cb 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -59,8 +59,8 @@ __initdata LIST_HEAD(huge_boot_pages);
 /* for command line parsing */
 static struct hstate * __initdata parsed_hstate;
 static unsigned long __initdata default_hstate_max_huge_pages;
-static unsigned long __initdata default_hstate_size;
 static bool __initdata parsed_valid_hugepagesz = true;
+static bool __initdata parsed_default_hugepagesz;
 
 /*
  * Protects updates to hugepage_freelists, hugepage_activelist, nr_huge_pages,
@@ -3060,7 +3060,7 @@ static void __init hugetlb_sysfs_init(void)
 		err = hugetlb_sysfs_add_hstate(h, hugepages_kobj,
 					 hstate_kobjs, &hstate_attr_group);
 		if (err)
-			pr_err("Hugetlb: Unable to add hstate %s", h->name);
+			pr_err("HugeTLB: Unable to add hstate %s", h->name);
 	}
 }
 
@@ -3164,7 +3164,7 @@ static void hugetlb_register_node(struct node *node)
 						nhs->hstate_kobjs,
 						&per_node_hstate_attr_group);
 		if (err) {
-			pr_err("Hugetlb: Unable to add hstate %s for node %d\n",
+			pr_err("HugeTLB: Unable to add hstate %s for node %d\n",
 				h->name, node->dev.id);
 			hugetlb_unregister_node(node);
 			break;
@@ -3215,19 +3215,35 @@ static int __init hugetlb_init(void)
 	if (!hugepages_supported())
 		return 0;
 
-	if (!size_to_hstate(default_hstate_size)) {
-		if (default_hstate_size != 0) {
-			pr_err("HugeTLB: unsupported default_hugepagesz %lu. Reverting to %lu\n",
-			       default_hstate_size, HPAGE_SIZE);
+	/*
+	 * Make sure HPAGE_SIZE (HUGETLB_PAGE_ORDER) hstate exists.  Some
+	 * architectures depend on setup being done here.
+	 */
+	hugetlb_add_hstate(HUGETLB_PAGE_ORDER);
+	if (!parsed_default_hugepagesz) {
+		/*
+		 * If we did not parse a default huge page size, set
+		 * default_hstate_idx to HPAGE_SIZE hstate. And, if the
+		 * number of huge pages for this default size was implicitly
+		 * specified, set that here as well.
+		 * Note that the implicit setting will overwrite an explicit
+		 * setting.  A warning will be printed in this case.
+		 */
+		default_hstate_idx = hstate_index(size_to_hstate(HPAGE_SIZE));
+		if (default_hstate_max_huge_pages) {
+			if (default_hstate.max_huge_pages) {
+				char buf[32];
+
+				string_get_size(huge_page_size(&default_hstate),
+					1, STRING_UNITS_2, buf, 32);
+				pr_warn("HugeTLB: Ignoring hugepages=%lu associated with %s page size\n",
+					default_hstate.max_huge_pages, buf);
+				pr_warn("HugeTLB: Using hugepages=%lu for number of default huge pages\n",
+					default_hstate_max_huge_pages);
+			}
+			default_hstate.max_huge_pages =
+				default_hstate_max_huge_pages;
 		}
-
-		default_hstate_size = HPAGE_SIZE;
-		hugetlb_add_hstate(HUGETLB_PAGE_ORDER);
-	}
-	default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size));
-	if (default_hstate_max_huge_pages) {
-		if (!default_hstate.max_huge_pages)
-			default_hstate.max_huge_pages = default_hstate_max_huge_pages;
 	}
 
 	hugetlb_cma_check();
@@ -3287,20 +3303,34 @@ void __init hugetlb_add_hstate(unsigned int order)
 	parsed_hstate = h;
 }
 
-static int __init hugetlb_nrpages_setup(char *s)
+/*
+ * hugepages command line processing
+ * hugepages normally follows a valid hugepagsz or default_hugepagsz
+ * specification.  If not, ignore the hugepages value.  hugepages can also
+ * be the first huge page command line  option in which case it implicitly
+ * specifies the number of huge pages for the default size.
+ */
+static int __init hugepages_setup(char *s)
 {
 	unsigned long *mhp;
 	static unsigned long *last_mhp;
 
+	if (!hugepages_supported()) {
+		pr_warn("HugeTLB: huge pages not supported, ignoring hugepages = %s\n", s);
+		return 0;
+	}
+
 	if (!parsed_valid_hugepagesz) {
-		pr_warn("hugepages = %s preceded by "
-			"an unsupported hugepagesz, ignoring\n", s);
+		pr_warn("HugeTLB: hugepages=%s does not follow a valid hugepagesz, ignoring\n", s);
 		parsed_valid_hugepagesz = true;
-		return 1;
+		return 0;
 	}
+
 	/*
-	 * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter yet,
-	 * so this hugepages= parameter goes to the "default hstate".
+	 * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter
+	 * yet, so this hugepages= parameter goes to the "default hstate".
+	 * Otherwise, it goes with the previously parsed hugepagesz or
+	 * default_hugepagesz.
 	 */
 	else if (!hugetlb_max_hstate)
 		mhp = &default_hstate_max_huge_pages;
@@ -3308,8 +3338,8 @@ static int __init hugetlb_nrpages_setup(char *s)
 		mhp = &parsed_hstate->max_huge_pages;
 
 	if (mhp == last_mhp) {
-		pr_warn("hugepages= specified twice without interleaving hugepagesz=, ignoring\n");
-		return 1;
+		pr_warn("HugeTLB: hugepages= specified twice without interleaving hugepagesz=, ignoring hugepages=%s\n", s);
+		return 0;
 	}
 
 	if (sscanf(s, "%lu", mhp) <= 0)
@@ -3327,42 +3357,109 @@ static int __init hugetlb_nrpages_setup(char *s)
 
 	return 1;
 }
-__setup("hugepages=", hugetlb_nrpages_setup);
+__setup("hugepages=", hugepages_setup);
 
+/*
+ * hugepagesz command line processing
+ * A specific huge page size can only be specified once with hugepagesz.
+ * hugepagesz is followed by hugepages on the command line.  The global
+ * variable 'parsed_valid_hugepagesz' is used to determine if prior
+ * hugepagesz argument was valid.
+ */
 static int __init hugepagesz_setup(char *s)
 {
 	unsigned long size;
+	struct hstate *h;
+
+	parsed_valid_hugepagesz = false;
+	if (!hugepages_supported()) {
+		pr_warn("HugeTLB: huge pages not supported, ignoring hugepagesz = %s\n", s);
+		return 0;
+	}
 
 	size = (unsigned long)memparse(s, NULL);
 
 	if (!arch_hugetlb_valid_size(size)) {
-		parsed_valid_hugepagesz = false;
-		pr_err("HugeTLB: unsupported hugepagesz %s\n", s);
+		pr_err("HugeTLB: unsupported hugepagesz=%s\n", s);
 		return 0;
 	}
 
-	if (size_to_hstate(size)) {
-		pr_warn("HugeTLB: hugepagesz %s specified twice, ignoring\n", s);
-		return 0;
+	h = size_to_hstate(size);
+	if (h) {
+		/*
+		 * hstate for this size already exists.  This is normally
+		 * an error, but is allowed if the existing hstate is the
+		 * default hstate.  More specifically, it is only allowed if
+		 * the number of huge pages for the default hstate was not
+		 * previously specified.
+		 */
+		if (!parsed_default_hugepagesz ||  h != &default_hstate ||
+		    default_hstate.max_huge_pages) {
+			pr_warn("HugeTLB: hugepagesz=%s specified twice, ignoring\n", s);
+			return 0;
+		}
+
+		/*
+		 * No need to call hugetlb_add_hstate() as hstate already
+		 * exists.  But, do set parsed_hstate so that a following
+		 * hugepages= parameter will be applied to this hstate.
+		 */
+		parsed_hstate = h;
+		parsed_valid_hugepagesz = true;
+		return 1;
 	}
 
 	hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT);
+	parsed_valid_hugepagesz = true;
 	return 1;
 }
 __setup("hugepagesz=", hugepagesz_setup);
 
+/*
+ * default_hugepagesz command line input
+ * Only one instance of default_hugepagesz allowed on command line.
+ */
 static int __init default_hugepagesz_setup(char *s)
 {
 	unsigned long size;
 
+	parsed_valid_hugepagesz = false;
+	if (!hugepages_supported()) {
+		pr_warn("HugeTLB: huge pages not supported, ignoring default_hugepagesz = %s\n", s);
+		return 0;
+	}
+
+	if (parsed_default_hugepagesz) {
+		pr_err("HugeTLB: default_hugepagesz previously specified, ignoring %s\n", s);
+		return 0;
+	}
+
 	size = (unsigned long)memparse(s, NULL);
 
 	if (!arch_hugetlb_valid_size(size)) {
-		pr_err("HugeTLB: unsupported default_hugepagesz %s\n", s);
+		pr_err("HugeTLB: unsupported default_hugepagesz=%s\n", s);
 		return 0;
 	}
 
-	default_hstate_size = size;
+	hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT);
+	parsed_valid_hugepagesz = true;
+	parsed_default_hugepagesz = true;
+	default_hstate_idx = hstate_index(size_to_hstate(size));
+
+	/*
+	 * The number of default huge pages (for this size) could have been
+	 * specified as the first hugetlb parameter: hugepages=X.  If so,
+	 * then default_hstate_max_huge_pages is set.  If the default huge
+	 * page size is gigantic (>= MAX_ORDER), then the pages must be
+	 * allocated here from bootmem allocator.
+	 */
+	if (default_hstate_max_huge_pages) {
+		default_hstate.max_huge_pages = default_hstate_max_huge_pages;
+		if (hstate_is_gigantic(&default_hstate))
+			hugetlb_hstate_alloc_pages(&default_hstate);
+		default_hstate_max_huge_pages = 0;
+	}
+
 	return 1;
 }
 __setup("default_hugepagesz=", default_hugepagesz_setup);
