From 80583d0cfd8ff44d60a5fa76a6bf3c08eb67c328 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 8 Dec 2023 13:46:48 -0500
Subject: [PATCH] KVM: guest-memfd: fix unused-function warning
With migration disabled, one function becomes unused:
virt/kvm/guest_memfd.c:262:12: error: 'kvm_gmem_migrate_folio' defined but not used [-Werror=unused-function]
262 | static int kvm_gmem_migrate_folio(struct address_space *mapping,
| ^~~~~~~~~~~~~~~~~~~~~~
Remove the #ifdef around the reference so that fallback_migrate_folio()
is never used. The gmem implementation of the hook is trivial; since
the gmem mapping is unmovable, the pages should not be migrated anyway.
Fixes: a7800aa80ea4 ("KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
virt/kvm/guest_memfd.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index b992723961195..c2e2371720a9c 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -300,9 +300,7 @@ static int kvm_gmem_error_page(struct address_space *mapping, struct page *page)
static const struct address_space_operations kvm_gmem_aops = {
.dirty_folio = noop_dirty_folio,
-#ifdef CONFIG_MIGRATION
.migrate_folio = kvm_gmem_migrate_folio,
-#endif
.error_remove_page = kvm_gmem_error_page,
};
--
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