linux-kernel - [PATCH RFC v7 2/8] mm/mempolicy: Export memory policy symbols

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Message-ID: <20250408112402.181574-3-shivankg@amd.com>
Date: Tue, 8 Apr 2025 11:23:56 +0000
From: Shivank Garg <shivankg@....com>
To: <seanjc@...gle.com>, <david@...hat.com>, <vbabka@...e.cz>,
	<willy@...radead.org>, <akpm@...ux-foundation.org>, <shuah@...nel.org>,
	<pbonzini@...hat.com>
CC: <ackerleytng@...gle.com>, <paul@...l-moore.com>, <jmorris@...ei.org>,
	<serge@...lyn.com>, <pvorel@...e.cz>, <bfoster@...hat.com>,
	<tabba@...gle.com>, <vannapurve@...gle.com>, <chao.gao@...el.com>,
	<bharata@....com>, <nikunj@....com>, <michael.day@....com>,
	<yan.y.zhao@...el.com>, <Neeraj.Upadhyay@....com>, <thomas.lendacky@....com>,
	<michael.roth@....com>, <aik@....com>, <jgg@...dia.com>,
	<kalyazin@...zon.com>, <peterx@...hat.com>, <shivankg@....com>,
	<linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <linux-security-module@...r.kernel.org>,
	<kvm@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
	<linux-coco@...ts.linux.dev>
Subject: [PATCH RFC v7 2/8] 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 b28a1e6ae096..18182dd38fc1 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -245,6 +245,7 @@ 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);
@@ -378,6 +379,7 @@ 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)
 {
@@ -2767,6 +2769,7 @@ 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)
 {
@@ -3052,6 +3055,7 @@ 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)
@@ -3070,6 +3074,7 @@ 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)
@@ -3088,6 +3093,7 @@ 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;
-- 
2.34.1