linux-kernel - [PATCH v2 1/2] hugetlb: Fix hugepages

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Message-ID: <20220401101232.2790280-2-liupeng256@huawei.com>
Date:   Fri, 1 Apr 2022 10:12:31 +0000
From:   Peng Liu <liupeng256@...wei.com>
To:     <mike.kravetz@...cle.com>, <akpm@...ux-foundation.org>,
        <yaozhenguo1@...il.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
CC:     <liupeng256@...wei.com>
Subject: [PATCH v2 1/2] hugetlb: Fix hugepages_setup when deal with pernode

Hugepages can be specified to pernode since "hugetlbfs: extend
the definition of hugepages parameter to support node allocation",
but the following problem is observed.

Confusing behavior is observed when both 1G and 2M hugepage is set
after "numa=off".
 cmdline hugepage settings:
  hugepagesz=1G hugepages=0:3,1:3
  hugepagesz=2M hugepages=0:1024,1:1024
 results:
  HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
  HugeTLB registered 2.00 MiB page size, pre-allocated 1024 pages

Furthermore, confusing behavior can be also observed when invalid
node behind valid node.

To fix this, hugetlb_hstate_alloc_pages should be called even when
hugepages_setup going to invalid.

Cc: <stable@...r.kernel.org>
Fixes: b5389086ad7b ("hugetlbfs: extend the definition of hugepages parameter to support node allocation")
Signed-off-by: Peng Liu <liupeng256@...wei.com>
---
 mm/hugetlb.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index b34f50156f7e..9cd746432ca9 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4131,6 +4131,7 @@ 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);
@@ -4189,6 +4190,7 @@ static int __init hugepages_setup(char *s)
 		}
 	}

+out:
 	/*
 	 * Global state is always initialized later in hugetlb_init.
 	 * But we need to allocate gigantic hstates here early to still
@@ -4199,11 +4201,12 @@ static int __init hugepages_setup(char *s)

 	last_mhp = mhp;

-	return 1;
+	return ret;

 invalid:
 	pr_warn("HugeTLB: Invalid hugepages parameter %s\n", p);
-	return 0;
+	ret = 0;
+	goto out;
 }
 __setup("hugepages=", hugepages_setup);

-- 
2.18.0.huawei.25