From a25c8a9cd0c30518d9c6208cbbb44b4ec8ff0bf9 Mon Sep 17 00:00:00 2001
From: Nick Piggin <npiggin@suse.de>
Date: Wed, 23 Jul 2008 21:27:52 -0700
Subject: [PATCH] --- yaml --- r: 105313 b: refs/heads/master c:
 e11bfbfcb08ef4223b863799897c19cdf7c5bc00 h: refs/heads/master i:   105311:
 97e2260a1ff33cd57f7a14198106986eaf9f3828 v: v3

---
 [refs]                                    |  2 +-
 trunk/Documentation/kernel-parameters.txt |  7 +++++++
 trunk/mm/hugetlb.c                        | 23 +++++++++++++++++------
 3 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/[refs] b/[refs]
index 19e8bdbae875..5047edc79bd4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b4718e628dbf68a2dee23b5709e2aa3190409c56
+refs/heads/master: e11bfbfcb08ef4223b863799897c19cdf7c5bc00
diff --git a/trunk/Documentation/kernel-parameters.txt b/trunk/Documentation/kernel-parameters.txt
index d55fd88fd0a9..30278e9e5211 100644
--- a/trunk/Documentation/kernel-parameters.txt
+++ b/trunk/Documentation/kernel-parameters.txt
@@ -783,6 +783,13 @@ and is between 256 and 4096 characters. It is defined in the file
 			CPU supports the "pdpe1gb" cpuinfo flag)
 			Note that 1GB pages can only be allocated at boot time
 			using hugepages= and not freed afterwards.
+	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.
 
 	i8042.direct	[HW] Put keyboard port into non-translated mode
 	i8042.dumbkbd	[HW] Pretend that controller can only read data from
diff --git a/trunk/mm/hugetlb.c b/trunk/mm/hugetlb.c
index 107c1ce223cb..2a2f6e869401 100644
--- a/trunk/mm/hugetlb.c
+++ b/trunk/mm/hugetlb.c
@@ -34,6 +34,7 @@ struct hstate hstates[HUGE_MAX_HSTATE];
 /* 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;
 
 #define for_each_hstate(h) \
 	for ((h) = hstates; (h) < &hstates[max_hstate]; (h)++)
@@ -1288,11 +1289,14 @@ static int __init hugetlb_init(void)
 {
 	BUILD_BUG_ON(HPAGE_SHIFT == 0);
 
-	if (!size_to_hstate(HPAGE_SIZE)) {
-		hugetlb_add_hstate(HUGETLB_PAGE_ORDER);
-		parsed_hstate->max_huge_pages = default_hstate_max_huge_pages;
+	if (!size_to_hstate(default_hstate_size)) {
+		default_hstate_size = HPAGE_SIZE;
+		if (!size_to_hstate(default_hstate_size))
+			hugetlb_add_hstate(HUGETLB_PAGE_ORDER);
 	}
-	default_hstate_idx = size_to_hstate(HPAGE_SIZE) - hstates;
+	default_hstate_idx = size_to_hstate(default_hstate_size) - hstates;
+	if (default_hstate_max_huge_pages)
+		default_hstate.max_huge_pages = default_hstate_max_huge_pages;
 
 	hugetlb_init_hstates();
 
@@ -1332,7 +1336,7 @@ void __init hugetlb_add_hstate(unsigned order)
 	parsed_hstate = h;
 }
 
-static int __init hugetlb_setup(char *s)
+static int __init hugetlb_nrpages_setup(char *s)
 {
 	unsigned long *mhp;
 	static unsigned long *last_mhp;
@@ -1367,7 +1371,14 @@ static int __init hugetlb_setup(char *s)
 
 	return 1;
 }
-__setup("hugepages=", hugetlb_setup);
+__setup("hugepages=", hugetlb_nrpages_setup);
+
+static int __init hugetlb_default_setup(char *s)
+{
+	default_hstate_size = memparse(s, &s);
+	return 1;
+}
+__setup("default_hugepagesz=", hugetlb_default_setup);
 
 static unsigned int cpuset_mems_nr(unsigned int *array)
 {