linux-next: manual merge of the mm-stable tree with the random tree

From: Stephen Rothwell
Date: Fri Oct 07 2022 - 01:56:02 EST

Hi all,

Today's linux-next merge of the mm-stable tree got a conflict in:


between commit:

82f33a32b4d2 ("treewide: use prandom_u32_max() when possible")

from the random tree and commit:

3e061d924fe9 ("lib/nodemask: optimize node_random for nodemask with single NUMA node")

from the mm-stable tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging. You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

Stephen Rothwell

diff --cc include/linux/nodemask.h
index 6f8a09e41cec,e66742db741c..000000000000
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@@ -504,11 -505,21 +505,20 @@@ static inline int num_node_state(enum n
static inline int node_random(const nodemask_t *maskp)
#if defined(CONFIG_NUMA) && (MAX_NUMNODES > 1)
- int w, bit = NUMA_NO_NODE;
+ int w, bit;

w = nodes_weight(*maskp);
- if (w)
+ switch (w) {
+ case 0:
+ bit = NUMA_NO_NODE;
+ break;
+ case 1:
+ bit = first_node(*maskp);
+ break;
+ default:
- bit = bitmap_ord_to_pos(maskp->bits,
- get_random_int() % w, MAX_NUMNODES);
+ bit = find_nth_bit(maskp->bits, MAX_NUMNODES, prandom_u32_max(w));
+ break;
+ }
return bit;
return 0;

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