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hugetlb: fix overcommit locking

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proc_doulongvec_minmax() calls copy_to_user()/copy_from_user(), so we can't
hold hugetlb_lock over the call.  Use a dummy variable to store the sysctl
result, like in hugetlb_sysctl_handler(), then grab the lock to update
nr_overcommit_huge_pages.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Reported-by: Miles Lane <miles.lane@gmail.com>
Cc: Adam Litke <agl@us.ibm.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nishanth Aravamudan
2008-02-13 15:03:19 -08:00
committed by Linus Torvalds
parent 2695a14d31
commit 064d9efe94
3 changed files with 7 additions and 5 deletions
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4
kernel/sysctl.c
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@ -978,8 +978,8 @@ static struct ctl_table vm_table[] = {
{
.ctl_name = CTL_UNNUMBERED,
.procname = "nr_overcommit_hugepages",
.data = &nr_overcommit_huge_pages,
.maxlen = sizeof(nr_overcommit_huge_pages),
.data = &sysctl_overcommit_huge_pages,
.maxlen = sizeof(sysctl_overcommit_huge_pages),
.mode = 0644,
.proc_handler = &hugetlb_overcommit_handler,
},