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[ Upstream commitd380ce7005] We need to protect the reader reading the sysctl value because the value can be changed concurrently. Fixes:1da177e4c3("Linux-2.6.12-rc2") Signed-off-by: Jason Xing <kernelxing@tencent.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>