[PATCH v2 2/4] xen: arm: rename p2m next_gfn_to_relinquish to lowest_mapped_gfn

[Ian Campbell <ian.campbell@citrix.com>]

This has other uses other than during relinquish, so rename it for clarity.

This is a pure rename.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
---
 xen/arch/arm/p2m.c        |    9 ++++-----
 xen/include/asm-arm/p2m.h |    8 +++++---
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index ace3c54..a61edeb 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -388,7 +388,7 @@ static int apply_p2m_changes(struct domain *d,
         {
             if ( hypercall_preempt_check() )
             {
-                p2m->next_gfn_to_relinquish = addr >> PAGE_SHIFT;
+                p2m->lowest_mapped_gfn = addr >> PAGE_SHIFT;
                 rc = -EAGAIN;
                 goto out;
             }
@@ -415,8 +415,7 @@ static int apply_p2m_changes(struct domain *d,
         unsigned long egfn = paddr_to_pfn(end_gpaddr);
 
         p2m->max_mapped_gfn = MAX(p2m->max_mapped_gfn, egfn);
-        /* Use next_gfn_to_relinquish to store the lowest gfn mapped */
-        p2m->next_gfn_to_relinquish = MIN(p2m->next_gfn_to_relinquish, sgfn);
+        p2m->lowest_mapped_gfn = MIN(p2m->lowest_mapped_gfn, sgfn);
     }
 
     rc = 0;
@@ -606,7 +605,7 @@ int p2m_init(struct domain *d)
     p2m->first_level = NULL;
 
     p2m->max_mapped_gfn = 0;
-    p2m->next_gfn_to_relinquish = ULONG_MAX;
+    p2m->lowest_mapped_gfn = ULONG_MAX;
 
 err:
     spin_unlock(&p2m->lock);
@@ -619,7 +618,7 @@ int relinquish_p2m_mapping(struct domain *d)
     struct p2m_domain *p2m = &d->arch.p2m;
 
     return apply_p2m_changes(d, RELINQUISH,
-                              pfn_to_paddr(p2m->next_gfn_to_relinquish),
+                              pfn_to_paddr(p2m->lowest_mapped_gfn),
                               pfn_to_paddr(p2m->max_mapped_gfn),
                               pfn_to_paddr(INVALID_MFN),
                               MATTR_MEM, p2m_invalid);
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index 53b3266..e9c884a 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -24,9 +24,11 @@ struct p2m_domain {
      */
     unsigned long max_mapped_gfn;
 
-    /* When releasing mapped gfn's in a preemptible manner, recall where
-     * to resume the search */
-    unsigned long next_gfn_to_relinquish;
+    /* Lowest mapped gfn in the p2m. When releasing mapped gfn's in a
+     * preemptible manner this is update to track recall where to
+     * resume the search. Apart from during teardown this can only
+     * decrease. */
+    unsigned long lowest_mapped_gfn;
 };
 
 /* List of possible type for each page in the p2m entry.
-- 
1.7.10.4