From 9fee021d15ddd884d40d1540913474e8112313fe Mon Sep 17 00:00:00 2001
From: Vaishali Thakkar <vaishali.thakkar@oracle.com>
Date: Thu, 19 May 2016 17:11:04 -0700
Subject: mm/hugetlb: introduce hugetlb_bad_size()

When any unsupported hugepage size is specified, 'hugepagesz=' and
'hugepages=' should be ignored during command line parsing until any
supported hugepage size is found.  But currently incorrect number of
hugepages are allocated when unsupported size is specified as it fails
to ignore the 'hugepages=' command.

Test case:

Note that this is specific to x86 architecture.

Boot the kernel with command line option 'hugepagesz=256M hugepages=X'.
After boot, dmesg output shows that X number of hugepages of the size 2M
is pre-allocated instead of 0.

So, to handle such command line options, introduce new routine
hugetlb_bad_size.  The routine hugetlb_bad_size sets the global variable
parsed_valid_hugepagesz.  We are using parsed_valid_hugepagesz to save
the state when unsupported hugepagesize is found so that we can ignore
the 'hugepages=' parameters after that and then reset the variable when
supported hugepage size is found.

The routine hugetlb_bad_size can be called while setting 'hugepagesz='
parameter in an architecture specific code.

Signed-off-by: Vaishali Thakkar <vaishali.thakkar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Cc: Dominik Dingel <dingel@linux.vnet.ibm.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/hugetlb.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'mm/hugetlb.c')

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index fb37ef810655..0adb74d0a4e1 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -51,6 +51,7 @@ __initdata LIST_HEAD(huge_boot_pages);
 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;
 
 /*
  * Protects updates to hugepage_freelists, hugepage_activelist, nr_huge_pages,
@@ -2659,6 +2660,11 @@ static int __init hugetlb_init(void)
 subsys_initcall(hugetlb_init);
 
 /* Should be called on processing a hugepagesz=... option */
+void __init hugetlb_bad_size(void)
+{
+	parsed_valid_hugepagesz = false;
+}
+
 void __init hugetlb_add_hstate(unsigned int order)
 {
 	struct hstate *h;
@@ -2691,11 +2697,17 @@ static int __init hugetlb_nrpages_setup(char *s)
 	unsigned long *mhp;
 	static unsigned long *last_mhp;
 
+	if (!parsed_valid_hugepagesz) {
+		pr_warn("hugepages = %s preceded by "
+			"an unsupported hugepagesz, ignoring\n", s);
+		parsed_valid_hugepagesz = true;
+		return 1;
+	}
 	/*
 	 * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter yet,
 	 * so this hugepages= parameter goes to the "default hstate".
 	 */
-	if (!hugetlb_max_hstate)
+	else if (!hugetlb_max_hstate)
 		mhp = &default_hstate_max_huge_pages;
 	else
 		mhp = &parsed_hstate->max_huge_pages;
-- 
cgit