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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2018-07-31 16:14:18 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-08-01 07:48:33 +0200
commitfb7d7518b0d65955f91c7b875c36eae7694c69bd (patch)
treededff29ea5e0555417a8d786686eeed70d301b59 /arch/s390
parent8cce437fbb5c1f2af2f63834fa05082596beca5d (diff)
downloadlinux-fb7d7518b0d65955f91c7b875c36eae7694c69bd.tar.bz2
s390/numa: move initial setup of node_to_cpumask_map
The numa_init_early initcall sets the node_to_cpumask_map[0] to the full cpu_possible_mask. Unfortunately this early_initcall is too late, the NUMA setup for numa=emu is done even earlier. The order of calls is numa_setup() -> emu_update_cpu_topology(), then the early_initcalls(), followed by sched_init_domains(). Starting with git commit 051f3ca02e46432c0965e8948f00c07d8a2f09c0 "sched/topology: Introduce NUMA identity node sched domain" the incorrect node_to_cpumask_map[0] really screws up the domain setup and the kernel panics with the follow oops: Cc: <stable@vger.kernel.org> # v4.15+ Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/numa/numa.c16
1 files changed, 2 insertions, 14 deletions
diff --git a/arch/s390/numa/numa.c b/arch/s390/numa/numa.c
index 06a80434cfe6..5bd374491f94 100644
--- a/arch/s390/numa/numa.c
+++ b/arch/s390/numa/numa.c
@@ -134,6 +134,8 @@ void __init numa_setup(void)
{
pr_info("NUMA mode: %s\n", mode->name);
nodes_clear(node_possible_map);
+ /* Initially attach all possible CPUs to node 0. */
+ cpumask_copy(&node_to_cpumask_map[0], cpu_possible_mask);
if (mode->setup)
mode->setup();
numa_setup_memory();
@@ -141,20 +143,6 @@ void __init numa_setup(void)
}
/*
- * numa_init_early() - Initialization initcall
- *
- * This runs when only one CPU is online and before the first
- * topology update is called for by the scheduler.
- */
-static int __init numa_init_early(void)
-{
- /* Attach all possible CPUs to node 0 for now. */
- cpumask_copy(&node_to_cpumask_map[0], cpu_possible_mask);
- return 0;
-}
-early_initcall(numa_init_early);
-
-/*
* numa_init_late() - Initialization initcall
*
* Register NUMA nodes.