Re: [PATCH 6.1.y] mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 2774f256e7c0219e2b0a0894af1c76bdabc4f974

WARNING: Author mismatch between patch and upstream commit:
Backport author: <jianqi.ren.cn@windriver.com>
Commit author: Byungchul Park<byungchul@sk.com>

Status in newer kernel trees:
6.14.y | Present (exact SHA1)
6.12.y | Present (exact SHA1)
6.6.y | Present (different SHA1: d6159bd4c005)

Note: The patch differs from the upstream commit:
---
1:  2774f256e7c02 ! 1:  dd7506755fcde mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index
    @@ Metadata
      ## Commit message ##
         mm/vmscan: fix a bug calling wakeup_kswapd() with a wrong zone index
     
    +    [ Upstream commit 2774f256e7c0219e2b0a0894af1c76bdabc4f974 ]
    +
         With numa balancing on, when a numa system is running where a numa node
         doesn't have its local memory so it has no managed zones, the following
         oops has been observed.  It's because wakeup_kswapd() is called with a
    @@ Commit message
         Cc: Johannes Weiner <hannes@cmpxchg.org>
         Cc: <stable@vger.kernel.org>
         Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    +    Signed-off-by: Jianqi Ren <jianqi.ren.cn@windriver.com>
    +    Signed-off-by: He Zhe <zhe.he@windriver.com>
     
      ## mm/migrate.c ##
    -@@ mm/migrate.c: static int numamigrate_isolate_folio(pg_data_t *pgdat, struct folio *folio)
    +@@ mm/migrate.c: static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
      			if (managed_zone(pgdat->node_zones + z))
      				break;
      		}
    @@ mm/migrate.c: static int numamigrate_isolate_folio(pg_data_t *pgdat, struct foli
     +		if (z < 0)
     +			return 0;
     +
    - 		wakeup_kswapd(pgdat->node_zones + z, 0,
    - 			      folio_order(folio), ZONE_MOVABLE);
    + 		wakeup_kswapd(pgdat->node_zones + z, 0, order, ZONE_MOVABLE);
      		return 0;
    + 	}
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.1.y        |  Success    |  Success   |