The patch titled
Subject: memory hotplug: reset pgdat->kswapd to NULL if creating kernel thread fails
has been removed from the -mm tree. Its filename was
memory-hotplug-reset-pgdat-kswapd-to-null-if-creating-kernel-thread-fails.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Wen Congyang <wency@xxxxxxxxxxxxxx>
Subject: memory hotplug: reset pgdat->kswapd to NULL if creating kernel thread fails
If kthread_run() fails, pgdat->kswapd contains errno. When we stop this
thread, we only check whether pgdat->kswapd is NULL and access it. If it
contains errno, it will cause page fault. Reset pgdat->kswapd to NULL
when creating kernel thread fails can avoid this problem.
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
Reviewed-by: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 1 +
1 file changed, 1 insertion(+)
diff -puN mm/vmscan.c~memory-hotplug-reset-pgdat-kswapd-to-null-if-creating-kernel-thread-fails mm/vmscan.c
--- a/mm/vmscan.c~memory-hotplug-reset-pgdat-kswapd-to-null-if-creating-kernel-thread-fails
+++ a/mm/vmscan.c
@@ -3102,6 +3102,7 @@ int kswapd_run(int nid)
/* failure at boot is fatal */
BUG_ON(system_state == SYSTEM_BOOTING);
printk("Failed to start kswapd on node %d\n",nid);
+ pgdat->kswapd = NULL;
ret = -1;
}
return ret;
_
Patches currently in -mm which might be from wency@xxxxxxxxxxxxxx are
origin.patch
cpu_hotplug-unmap-cpu2node-when-the-cpu-is-hotremoved.patch
acpi_memhotplugc-fix-memory-leak-when-memory-device-is-unbound-from-the-module-acpi_memhotplug.patch
acpi_memhotplugc-free-memory-device-if-acpi_memory_enable_device-failed.patch
acpi_memhotplugc-remove-memory-info-from-list-before-freeing-it.patch
acpi_memhotplugc-dont-allow-to-eject-the-memory-device-if-it-is-being-used.patch
acpi_memhotplugc-bind-the-memory-device-when-the-driver-is-being-loaded.patch
acpi_memhotplugc-auto-bind-the-memory-device-which-is-hotplugged-before-the-driver-is-loaded.patch
x86-numa-dont-check-if-node-is-numa_no_node.patch
mm-page_alloc-use-get_freepage_migratetype-instead-of-page_private.patch
mm-remain-migratetype-in-freed-page.patch
memory-hotplug-bug-fix-race-between-isolation-and-allocation.patch
memory-hotplug-fix-pages-missed-by-race-rather-than-failing.patch
mm-page_alloc-refactor-out-__alloc_contig_migrate_alloc.patch
memory-hotplug-dont-replace-lowmem-pages-with-highmem.patch
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