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Add ampere_cspmu to toctree in order to address the following warning produced when building documents: Documentation/admin-guide/perf/ampere_cspmu.rst: WARNING: document isn't included in any toctree Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Closes: https://lore.kernel.org/all/20231011172250.5a6498e5@canb.auug.org.au/ Fixes: 53a810ad3c5c ("perf: arm_cspmu: ampere_cspmu: Add support for Ampere SoC PMU") Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com> Link: https://lore.kernel.org/r/20231012074103.3772114-1-ilkka@os.amperecomputing.com Signed-off-by: Will Deacon <will@kernel.org>