[PATCH] x86/shadow: Reposition sh_remove_write_access_from_sl1p()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

When compiling with SHOPT_OUT_OF_SYNC disabled, the build fails with:

  common.c:41:12: error: ‘sh_remove_write_access_from_sl1p’ declared ‘static’ 
but never defined [-Werror=unused-function]
   static int sh_remove_write_access_from_sl1p(struct domain *d, mfn_t gmfn,
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

due to an unguarded forward declaration.

It turns out there is no need to forward declare
sh_remove_write_access_from_sl1p() to begin with, so move it to just ahead of
its first users, which is within a larger #ifdef'd SHOPT_OUT_OF_SYNC block.

Fix up for style while moving it.  No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
---
 xen/arch/x86/mm/shadow/common.c | 56 ++++++++++++++++++-----------------------
 1 file changed, 25 insertions(+), 31 deletions(-)

diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c
index 0ac3f880e1..6dff240e97 100644
--- a/xen/arch/x86/mm/shadow/common.c
+++ b/xen/arch/x86/mm/shadow/common.c
@@ -38,9 +38,6 @@
 #include <xen/numa.h>
 #include "private.h"
 
-static int sh_remove_write_access_from_sl1p(struct domain *d, mfn_t gmfn,
-                                            mfn_t smfn, unsigned long offset);
-
 DEFINE_PER_CPU(uint32_t,trace_shadow_path_flags);
 
 static int sh_enable_log_dirty(struct domain *, bool log_global);
@@ -252,6 +249,31 @@ static inline void _sh_resync_l1(struct vcpu *v, mfn_t 
gmfn, mfn_t snpmfn)
         SHADOW_INTERNAL_NAME(sh_resync_l1, 4)(v, gmfn, snpmfn);
 }
 
+static int sh_remove_write_access_from_sl1p(struct domain *d, mfn_t gmfn,
+                                            mfn_t smfn, unsigned long off)
+{
+    struct page_info *sp = mfn_to_page(smfn);
+
+    ASSERT(mfn_valid(smfn));
+    ASSERT(mfn_valid(gmfn));
+
+    if ( sp->u.sh.type == SH_type_l1_32_shadow ||
+         sp->u.sh.type == SH_type_fl1_32_shadow )
+        return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p, 2)
+            (d, gmfn, smfn, off);
+
+    if ( sp->u.sh.type == SH_type_l1_pae_shadow ||
+         sp->u.sh.type == SH_type_fl1_pae_shadow )
+        return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p, 3)
+            (d, gmfn, smfn, off);
+
+    if ( sp->u.sh.type == SH_type_l1_64_shadow ||
+         sp->u.sh.type == SH_type_fl1_64_shadow )
+        return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p, 4)
+            (d, gmfn, smfn, off);
+
+    return 0;
+}
 
 /*
  * Fixup arrays: We limit the maximum number of writable mappings to
@@ -2001,34 +2023,6 @@ int sh_remove_write_access(struct domain *d, mfn_t gmfn,
 }
 #endif /* CONFIG_HVM */
 
-#if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC)
-static int sh_remove_write_access_from_sl1p(struct domain *d, mfn_t gmfn,
-                                            mfn_t smfn, unsigned long off)
-{
-    struct page_info *sp = mfn_to_page(smfn);
-
-    ASSERT(mfn_valid(smfn));
-    ASSERT(mfn_valid(gmfn));
-
-    if ( sp->u.sh.type == SH_type_l1_32_shadow
-         || sp->u.sh.type == SH_type_fl1_32_shadow )
-    {
-        return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p,2)
-            (d, gmfn, smfn, off);
-    }
-    else if ( sp->u.sh.type == SH_type_l1_pae_shadow
-              || sp->u.sh.type == SH_type_fl1_pae_shadow )
-        return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p,3)
-            (d, gmfn, smfn, off);
-    else if ( sp->u.sh.type == SH_type_l1_64_shadow
-              || sp->u.sh.type == SH_type_fl1_64_shadow )
-        return SHADOW_INTERNAL_NAME(sh_rm_write_access_from_sl1p,4)
-            (d, gmfn, smfn, off);
-
-    return 0;
-}
-#endif
-
 /**************************************************************************/
 /* Remove all mappings of a guest frame from the shadow tables.
  * Returns non-zero if we need to flush TLBs. */
-- 
2.11.0