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Cédric pointed out that XIVE IPI information exported via sysfs (debug/powerpc/xive) display empty lines for processors which are not online. Switch to using for_each_online_cpu() so that information is displayed for online-only processors. Reported-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Sachin Sant <sachinp@linux.ibm.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/164146703333.19039.10920919226094771665.sendpatchset@MacBook-Pro.local