[066/166] powernv/memtrace: always online added memory blocks

Commit Message

Andrew Morton April 7, 2020, 3:07 a.m. UTC

From: David Hildenbrand <[e-mail]>
Subject: powernv/memtrace: always online added memory blocks

Let's always try to online the re-added memory blocks.  In case
add_memory() already onlined the added memory blocks, the first
device_online() call will fail and stop processing the remaining memory
blocks.

This avoids manually having to check memhp_auto_online.

Note: PPC always onlines all hotplugged memory directly from the kernel as
well - something that is handled by user space on other architectures.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: David Hildenbrand <[e-mail]>
Acked-by: Michal Hocko <[e-mail]>
Reviewed-by: Wei Yang <[e-mail]>
Reviewed-by: Baoquan He <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Oscar Salvador <[e-mail]>
Cc: "Rafael J. Wysocki" <[e-mail]>
Cc: Eduardo Habkost <[e-mail]>
Cc: Haiyang Zhang <[e-mail]>
Cc: Igor Mammedov <[e-mail]>
Cc: "K. Y. Srinivasan" <[e-mail]>
Cc: Stephen Hemminger <[e-mail]>
Cc: Vitaly Kuznetsov <[e-mail]>
Cc: Wei Liu <[e-mail]>
Cc: Yumei Huang <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 arch/powerpc/platforms/powernv/memtrace.c |   14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

Patch

--- a/arch/powerpc/platforms/powernv/memtrace.c~powernv-memtrace-always-online-added-memory-blocks
+++ a/arch/powerpc/platforms/powernv/memtrace.c
@@ -231,16 +231,10 @@  static int memtrace_online(void)
 			continue;
 		}
 
-		/*
-		 * If kernel isn't compiled with the auto online option
-		 * we need to online the memory ourselves.
-		 */
-		if (!memhp_auto_online) {
-			lock_device_hotplug();
-			walk_memory_blocks(ent->start, ent->size, NULL,
-					   online_mem_block);
-			unlock_device_hotplug();
-		}
+		lock_device_hotplug();
+		walk_memory_blocks(ent->start, ent->size, NULL,
+				   online_mem_block);
+		unlock_device_hotplug();
 
 		/*
 		 * Memory was added successfully so clean up references to it