From 68fb18aacb410aff26c24a3d73d27ad496f0a548 Mon Sep 17 00:00:00 2001 From: "Srivatsa S. Bhat" Date: Mon, 30 Dec 2013 17:06:04 +0530 Subject: [PATCH] powerpc: Add debug checks to catch invalid cpu-to-node mappings There have been some weird bugs in the past where the kernel tried to associate threads of the same core to different NUMA nodes, and things went haywire after that point (as expected). But unfortunately, root-causing such issues have been quite challenging, due to the lack of appropriate debug checks in the kernel. These bugs usually lead to some odd soft-lockups in the scheduler's build-sched-domain code in the CPU hotplug path, which makes it very hard to trace it back to the incorrect cpu-to-node mappings. So add appropriate debug checks to catch such invalid cpu-to-node mappings as early as possible. Signed-off-by: Srivatsa S. Bhat Signed-off-by: Benjamin Herrenschmidt --- Reading git-format-patch failed