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powerpc/inst: Fix sparse detection on get_user_instr()
[ Upstream commit b3a9e52 ] get_user_instr() lacks sparse detection for the __user tag. This is because __gui_ptr is assigned with a cast. Fix that by adding a __chk_user_ptr() Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/0320e5b41a794fd456ab8c5993bbfadcf9e1d8b4.1621516826.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin <sashal@kernel.org>
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