[RFC,v5,2/4] mm/mempolicy: export memory policy symbols

Commit Message

Shivank Garg Feb. 19, 2025, 10:15 a.m. UTC

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 <[e-mail]>
Signed-off-by: Shivank Garg <[e-mail]>
---
 mm/mempolicy.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index bbaadbeeb291..d9c5dcdadcd0 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -214,6 +214,7 @@  struct mempolicy *get_task_policy(struct task_struct *p)
 
 	return &default_policy;
 }
+EXPORT_SYMBOL_GPL(get_task_policy);
 
 static const struct mempolicy_operations {
 	int (*create)(struct mempolicy *pol, const nodemask_t *nodes);
@@ -347,6 +348,7 @@  void __mpol_put(struct mempolicy *pol)
 		return;
 	kmem_cache_free(policy_cache, pol);
 }
+EXPORT_SYMBOL_GPL(__mpol_put);
 
 static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes)
 {
@@ -2736,6 +2738,7 @@  struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
 	read_unlock(&sp->lock);
 	return pol;
 }
+EXPORT_SYMBOL_GPL(mpol_shared_policy_lookup);
 
 static void sp_free(struct sp_node *n)
 {
@@ -3021,6 +3024,7 @@  void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol)
 		mpol_put(mpol);	/* drop our incoming ref on sb mpol */
 	}
 }
+EXPORT_SYMBOL_GPL(mpol_shared_policy_init);
 
 int mpol_set_shared_policy(struct shared_policy *sp,
 			struct vm_area_struct *vma, struct mempolicy *pol)
@@ -3039,6 +3043,7 @@  int mpol_set_shared_policy(struct shared_policy *sp,
 		sp_free(new);
 	return err;
 }
+EXPORT_SYMBOL_GPL(mpol_set_shared_policy);
 
 /* Free a backing policy store on inode delete. */
 void mpol_free_shared_policy(struct shared_policy *sp)
@@ -3057,6 +3062,7 @@  void mpol_free_shared_policy(struct shared_policy *sp)
 	}
 	write_unlock(&sp->lock);
 }
+EXPORT_SYMBOL_GPL(mpol_free_shared_policy);
 
 #ifdef CONFIG_NUMA_BALANCING
 static int __initdata numabalancing_override;