From: "Petr Holasek" <redacted>
To: linux-kernel@vger.kernel.org
Cc: "Petr Holasek" <redacted>, "Andi Kleen" <redacted>, "Naoya Horiguchi"
[off-list ref], "Mel Gorman" [off-list ref], "Andrew Morton" [off-list ref], "Wu Fengguang"
[off-list ref], linux-mm@kvack.org
Sent: Tuesday, February 22, 2011 9:17:04 PM
Subject: [PATCH v2] hugetlbfs: correct handling of negative input to /proc/sys/vm/nr_hugepages
When user insert negative value into /proc/sys/vm/nr_hugepages it will
result
in the setting a random number of HugePages in system (can be easily
showed
at /proc/meminfo output). This patch fixes the wrong behavior so that
the
negative input will result in nr_hugepages value unchanged.

v2: same fix was also done in hugetlb_overcommit_handler function
as suggested by reviewers.

Signed-off-by: Petr Holasek <redacted>
Reviewed-by: Naoya Horiguchi <redacted>
---
mm/hugetlb.c | 6 ++----
1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bb0b7c1..06de5aa 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c

@@ -1872,8 +1872,7 @@ static int hugetlb_sysctl_handler_common(bool

obey_mempolicy,
unsigned long tmp;
int ret;

- if (!write)
- tmp = h->max_huge_pages;
+ tmp = h->max_huge_pages;

if (write && h->order >= MAX_ORDER)
return -EINVAL;

@@ -1938,8 +1937,7 @@ int hugetlb_overcommit_handler(struct ctl_table

*table, int write,
unsigned long tmp;
int ret;

- if (!write)
- tmp = h->nr_overcommit_huge_pages;
+ tmp = h->nr_overcommit_huge_pages;

if (write && h->order >= MAX_ORDER)
return -EINVAL;
--
1.7.1
--
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