[PATCH v2 2/2] hugetlb: Fix return value of __setup handlers

[Peng Liu]

When __setup() return '0', using invalid option values causes the
entire kernel boot option string to be reported as Unknown. Hugetlb
calls __setup() and will return '0' when set invalid parameter
string.

The following phenomenon is observed:
 cmdline:
  hugepagesz=1Y hugepages=1
 dmesg:
  HugeTLB: unsupported hugepagesz=1Y
  HugeTLB: hugepages=1 does not follow a valid hugepagesz, ignoring
  Unknown kernel command line parameters "hugepagesz=1Y hugepages=1"

Since hugetlb will print warn or error information before return for
invalid parameter string, just use return '1' to avoid print again.

Signed-off-by: Peng Liu <liupeng256@xxxxxxxxxx>
---
 mm/hugetlb.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 9cd746432ca9..6dde34c115c9 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4131,12 +4131,11 @@ static int __init hugepages_setup(char *s)
 	int count;
 	unsigned long tmp;
 	char *p = s;
-	int ret = 1;
 
 	if (!parsed_valid_hugepagesz) {
 		pr_warn("HugeTLB: hugepages=%s does not follow a valid hugepagesz, ignoring\n", s);
 		parsed_valid_hugepagesz = true;
-		return 0;
+		return 1;
 	}
 
 	/*
@@ -4152,7 +4151,7 @@ static int __init hugepages_setup(char *s)
 
 	if (mhp == last_mhp) {
 		pr_warn("HugeTLB: hugepages= specified twice without interleaving hugepagesz=, ignoring hugepages=%s\n", s);
-		return 0;
+		return 1;
 	}
 
 	while (*p) {
@@ -4163,7 +4162,7 @@ static int __init hugepages_setup(char *s)
 		if (p[count] == ':') {
 			if (!hugetlb_node_alloc_supported()) {
 				pr_warn("HugeTLB: architecture can't support node specific alloc, ignoring!\n");
-				return 0;
+				return 1;
 			}
 			if (tmp >= nr_online_nodes)
 				goto invalid;
@@ -4201,11 +4200,10 @@ static int __init hugepages_setup(char *s)
 
 	last_mhp = mhp;
 
-	return ret;
+	return 1;
 
 invalid:
 	pr_warn("HugeTLB: Invalid hugepages parameter %s\n", p);
-	ret = 0;
 	goto out;
 }
 __setup("hugepages=", hugepages_setup);
@@ -4227,7 +4225,7 @@ static int __init hugepagesz_setup(char *s)
 
 	if (!arch_hugetlb_valid_size(size)) {
 		pr_err("HugeTLB: unsupported hugepagesz=%s\n", s);
-		return 0;
+		return 1;
 	}
 
 	h = size_to_hstate(size);
@@ -4242,7 +4240,7 @@ static int __init hugepagesz_setup(char *s)
 		if (!parsed_default_hugepagesz ||  h != &default_hstate ||
 		    default_hstate.max_huge_pages) {
 			pr_warn("HugeTLB: hugepagesz=%s specified twice, ignoring\n", s);
-			return 0;
+			return 1;
 		}
 
 		/*
@@ -4273,14 +4271,14 @@ static int __init default_hugepagesz_setup(char *s)
 	parsed_valid_hugepagesz = false;
 	if (parsed_default_hugepagesz) {
 		pr_err("HugeTLB: default_hugepagesz previously specified, ignoring %s\n", s);
-		return 0;
+		return 1;
 	}
 
 	size = (unsigned long)memparse(s, NULL);
 
 	if (!arch_hugetlb_valid_size(size)) {
 		pr_err("HugeTLB: unsupported default_hugepagesz=%s\n", s);
-		return 0;
+		return 1;
 	}
 
 	hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT);
-- 
2.18.0.huawei.25