linux-kernel - [RFC PATCH v4 2/3] mm/mempolicy: export memory policy symbols

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Message-ID: <20250210063227.41125-3-shivankg@amd.com>
Date: Mon, 10 Feb 2025 06:32:28 +0000
From: Shivank Garg <shivankg@....com>
To: <akpm@...ux-foundation.org>, <willy@...radead.org>, <pbonzini@...hat.com>
CC: <linux-fsdevel@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
	<linux-coco@...ts.linux.dev>, <chao.gao@...el.com>, <seanjc@...gle.com>,
	<ackerleytng@...gle.com>, <david@...hat.com>, <vbabka@...e.cz>,
	<bharata@....com>, <nikunj@....com>, <michael.day@....com>,
	<Neeraj.Upadhyay@....com>, <thomas.lendacky@....com>, <michael.roth@....com>,
	<shivankg@....com>
Subject: [RFC PATCH v4 2/3] mm/mempolicy: export memory policy symbols

Export memory policy related symbols needed by the KVM guest-memfd to
implement NUMA policy support.

These symbols are required to implement per-memory region NUMA policies
for guest memory, allowing VMMs to control guest memory placement across
NUMA nodes.

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 bbaadbeeb291..9c15780cfa63 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(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(__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(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(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(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(mpol_free_shared_policy);
 
 #ifdef CONFIG_NUMA_BALANCING
 static int __initdata numabalancing_override;
-- 
2.34.1