[PATCH 4/5] mm/hotplug: Avoid RCU stalls when removing large amounts of memory

[Alastair D'Silva]

From: Alastair D'Silva <alastair@xxxxxxxxxxx>

When removing sufficiently large amounts of memory, we trigger RCU stall
detection. By periodically calling cond_resched(), we avoid bogus stall
warnings.

Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx>
---
 mm/memory_hotplug.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index e096c987d261..382b3a0c9333 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -578,6 +578,9 @@ void __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
 		__remove_section(zone, __pfn_to_section(pfn), map_offset,
 				 altmap);
 		map_offset = 0;
+
+		if (!(i & 0x0FFF))
+			cond_resched();
 	}
 
 	set_zone_contiguous(zone);
-- 
2.21.0