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* [patch 089/158] mm/vmalloc: respect passed gfp_mask when doing preloading
@ 2019-12-01  1:54 akpm
  0 siblings, 0 replies; only message in thread
From: akpm @ 2019-12-01  1:54 UTC (permalink / raw)
  To: akpm, bigeasy, dwagner, hdanton, linux-mm, mhocko, mm-commits,
	oleksiy.avramchenko, peterz, rostedt, tglx, torvalds, urezki,

From: "Uladzislau Rezki (Sony)" <>
Subject: mm/vmalloc: respect passed gfp_mask when doing preloading

Allocation functions should comply with the given gfp_mask as much as
possible.  The preallocation code in alloc_vmap_area doesn't follow that
pattern and it is using a hardcoded GFP_KERNEL.  Although this doesn't
really make much difference because vmalloc is not GFP_NOWAIT compliant in
general (e.g.  page table allocations are GFP_KERNEL) there is no reason
to spread that bad habit and it is good to fix the antipattern.

[ rewrite changelog]
Signed-off-by: Uladzislau Rezki (Sony) <>
Acked-by: Michal Hocko <>
Cc: Daniel Wagner <>
Cc: Hillf Danton <>
Cc: Matthew Wilcox <>
Cc: Oleksiy Avramchenko <>
Cc: Peter Zijlstra <>
Cc: Sebastian Andrzej Siewior <>
Cc: Steven Rostedt <>
Cc: Thomas Gleixner <>
Signed-off-by: Andrew Morton <>

 mm/vmalloc.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/mm/vmalloc.c~mm-vmalloc-respect-passed-gfp_mask-when-do-preloading
+++ a/mm/vmalloc.c
@@ -1063,9 +1063,9 @@ static struct vmap_area *alloc_vmap_area
 		return ERR_PTR(-EBUSY);
+	gfp_mask = gfp_mask & GFP_RECLAIM_MASK;
-	va = kmem_cache_alloc_node(vmap_area_cachep,
-			gfp_mask & GFP_RECLAIM_MASK, node);
+	va = kmem_cache_alloc_node(vmap_area_cachep, gfp_mask, node);
 	if (unlikely(!va))
 		return ERR_PTR(-ENOMEM);
@@ -1073,7 +1073,7 @@ static struct vmap_area *alloc_vmap_area
 	 * Only scan the relevant parts containing pointers to other objects
 	 * to avoid false negatives.
-	kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask & GFP_RECLAIM_MASK);
+	kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask);
@@ -1099,7 +1099,7 @@ retry:
 		 * Just proceed as it is. If needed "overflow" path
 		 * will refill the cache we allocate from.
-		pva = kmem_cache_alloc_node(vmap_area_cachep, GFP_KERNEL, node);
+		pva = kmem_cache_alloc_node(vmap_area_cachep, gfp_mask, node);

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2019-12-01  1:54 [patch 089/158] mm/vmalloc: respect passed gfp_mask when doing preloading akpm

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