diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-09-25 06:19:19 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-09-25 06:19:19 +0200 |
| commit | 8c1c6c7588b2faf9dd45fb3cfb7497fd09bbfe7c (patch) | |
| tree | 50a7ddcfd7e7b1a7e4fb656bb88a036dbcff4bd6 /mm/memory_hotplug.c | |
| parent | 38225f2ef2f4263fc65acae63fdd4e8489c9ffcf (diff) | |
| parent | 171d4ff79f965c1f164705ef0aaea102a6ad238b (diff) | |
Merge branch 'master' of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into dma-mapping-for-next
Pull in the latest 5.9 tree for the commit to revert the
V4L2_FLAG_MEMORY_NON_CONSISTENT uapi addition.
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index e9d5ab5d3ca09..b11a269e23561 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1575,6 +1575,20 @@ static int __ref __offline_pages(unsigned long start_pfn, /* check again */ ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, check_pages_isolated_cb); + /* + * per-cpu pages are drained in start_isolate_page_range, but if + * there are still pages that are not free, make sure that we + * drain again, because when we isolated range we might + * have raced with another thread that was adding pages to pcp + * list. + * + * Forward progress should be still guaranteed because + * pages on the pcp list can only belong to MOVABLE_ZONE + * because has_unmovable_pages explicitly checks for + * PageBuddy on freed pages on other zones. + */ + if (ret) + drain_all_pages(zone); } while (ret); /* Ok, all of our target is isolated. |