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mm/mempolicy: Export memory policy symbols

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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@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Shivank Garg <shivankg@amd.com>
Tested-by: Ashish Kalra <ashish.kalra@amd.com>
Link: https://lore.kernel.org/r/20250827175247.83322-6-shivankg@amd.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Shivank Garg
2025-08-27 17:52:45 +00:00
committed by Sean Christopherson
parent 16a542e223
commit f634f10809
1 changed files with 6 additions and 0 deletions
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6
mm/mempolicy.c
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@@ -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 @@ put_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;