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由 Michael Ellerman 提交于
Move the core logic into a helper, so we can use it for changing permissions other than _PAGE_WRITE. Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au> Reviewed-by: NBalbir Singh <bsingharora@gmail.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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