linux-kernel - [PATCH kvm-next V11 3/7] mm/mempolicy: Export memory policy symbols

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Message-ID: <20250827175247.83322-6-shivankg@amd.com>
Date: Wed, 27 Aug 2025 17:52:45 +0000
From: Shivank Garg <shivankg@....com>
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Subject: [PATCH kvm-next V11 3/7] mm/mempolicy: Export memory policy symbols

KVM guest_memfd wants to implement support for NUMA policies just like
shmem already does using the shared policy infrastructure. As
guest_memfd currently resides in KVM module code, we have to export the
relevant symbols.

In the future, guest_memfd might be moved to core-mm, at which point the
symbols no longer would have to be exported. When/if that happens is
still unclear.

Acked-by: David Hildenbrand <david@...hat.com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Signed-off-by: Shivank Garg <shivankg@....com>
---
 mm/mempolicy.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index eb83cff7db8c..3d797d47a040 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -354,6 +354,7 @@ struct mempolicy *get_task_policy(struct task_struct *p)
 
 	return &default_policy;
 }
+EXPORT_SYMBOL_FOR_MODULES(get_task_policy, "kvm");
 
 static const struct mempolicy_operations {
 	int (*create)(struct mempolicy *pol, const nodemask_t *nodes);
@@ -487,6 +488,7 @@ void __mpol_put(struct mempolicy *pol)
 		return;
 	kmem_cache_free(policy_cache, pol);
 }
+EXPORT_SYMBOL_FOR_MODULES(__mpol_put, "kvm");
 
 static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes)
 {
@@ -2885,6 +2887,7 @@ struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
 	read_unlock(&sp->lock);
 	return pol;
 }
+EXPORT_SYMBOL_FOR_MODULES(mpol_shared_policy_lookup, "kvm");
 
 static void sp_free(struct sp_node *n)
 {
@@ -3170,6 +3173,7 @@ void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol)
 		mpol_put(mpol);	/* drop our incoming ref on sb mpol */
 	}
 }
+EXPORT_SYMBOL_FOR_MODULES(mpol_shared_policy_init, "kvm");
 
 int mpol_set_shared_policy(struct shared_policy *sp,
 			struct vm_area_struct *vma, struct mempolicy *pol)
@@ -3188,6 +3192,7 @@ int mpol_set_shared_policy(struct shared_policy *sp,
 		sp_free(new);
 	return err;
 }
+EXPORT_SYMBOL_FOR_MODULES(mpol_set_shared_policy, "kvm");
 
 /* Free a backing policy store on inode delete. */
 void mpol_free_shared_policy(struct shared_policy *sp)
@@ -3206,6 +3211,7 @@ void mpol_free_shared_policy(struct shared_policy *sp)
 	}
 	write_unlock(&sp->lock);
 }
+EXPORT_SYMBOL_FOR_MODULES(mpol_free_shared_policy, "kvm");
 
 #ifdef CONFIG_NUMA_BALANCING
 static int __initdata numabalancing_override;
-- 
2.43.0