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[ Upstream commit 8873aab8646194a4446117bb617cc71bddda2dee ] All these commands end up peeking into the PACA using the user originated cpu id as an index. Check the cpu id is valid in order to prevent xmon to crash. Instead of printing an error, this follows the same behavior as the "lp s #" command : ignore the buggy cpu id parameter and fall back to the #-less version of the command. Signed-off-by: Greg Kurz <groug@kaod.org> Reviewed-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/161531347060.252863.10490063933688958044.stgit@bahia.lan Signed-off-by: Sasha Levin <sashal@kernel.org> (cherry picked from commit 04b90b8d0b6929d7427551215b71901959c8e098) Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>