From: Paul Durrant <pdurrant@amazon.com>
Date: Fri, 24 Jan 2020 15:31:03 +0000 (+0000)
Subject: xen/mm: remove donate_page()
X-Git-Tag: archive/raspbian/4.14.0+80-gd101b417b7-1+rpi1^2~63^2~810
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=f190e634daba1a40570700b3e7697d497874c66f;p=xen.git

xen/mm: remove donate_page()

This function was only ever used by TMEM, so had its sole caller dropped by
c/s c492e19fdd "xen: remove tmem from hypervisor".

Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: George Dunlap <george.dunlap@citrix.com>
Acked-by: Julien Grall <julien@xen.org>
---

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 4d6c971f37..727107eefa 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1353,12 +1353,6 @@ void arch_dump_shared_mem_info(void)
 {
 }
 
-int donate_page(struct domain *d, struct page_info *page, unsigned int memflags)
-{
-    ASSERT_UNREACHABLE();
-    return -ENOSYS;
-}
-
 int steal_page(
     struct domain *d, struct page_info *page, unsigned int memflags)
 {
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 654190e9e9..f50c065af3 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4184,47 +4184,6 @@ long do_mmu_update(
 }
 #endif /* CONFIG_PV */
 
-int donate_page(
-    struct domain *d, struct page_info *page, unsigned int memflags)
-{
-    const struct domain *owner = dom_xen;
-
-    spin_lock(&d->page_alloc_lock);
-
-    if ( is_xen_heap_page(page) || ((owner = page_get_owner(page)) != NULL) )
-        goto fail;
-
-    if ( d->is_dying )
-        goto fail;
-
-    if ( page->count_info & ~(PGC_allocated | 1) )
-        goto fail;
-
-    if ( !(memflags & MEMF_no_refcount) )
-    {
-        if ( d->tot_pages >= d->max_pages )
-            goto fail;
-        if ( unlikely(domain_adjust_tot_pages(d, 1) == 1) )
-            get_knownalive_domain(d);
-    }
-
-    page->count_info = PGC_allocated | 1;
-    page_set_owner(page, d);
-    page_list_add_tail(page,&d->page_list);
-
-    spin_unlock(&d->page_alloc_lock);
-    return 0;
-
- fail:
-    spin_unlock(&d->page_alloc_lock);
-    gdprintk(XENLOG_WARNING, "Bad donate mfn %" PRI_mfn
-             " to d%d (owner d%d) caf=%08lx taf=%" PRtype_info "\n",
-             mfn_x(page_to_mfn(page)), d->domain_id,
-             owner ? owner->domain_id : DOMID_INVALID,
-             page->count_info, page->u.inuse.type_info);
-    return -EINVAL;
-}
-
 /*
  * Steal page will attempt to remove `page` from domain `d`.  Upon
  * return, `page` will be in a state similar to the state of a page
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index 8d0ddfb60c..d0d095d9c7 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -599,8 +599,6 @@ int xenmem_add_to_physmap(struct domain *d, struct xen_add_to_physmap *xatp,
 int __must_check guest_remove_page(struct domain *d, unsigned long gmfn);
 int __must_check steal_page(struct domain *d, struct page_info *page,
                             unsigned int memflags);
-int __must_check donate_page(struct domain *d, struct page_info *page,
-                             unsigned int memflags);
 
 #define RAM_TYPE_CONVENTIONAL 0x00000001
 #define RAM_TYPE_RESERVED     0x00000002