C-EDF: Make migration affinity work with Release Master

Needed to update C-EDF to handle release master.  Also
updated get_nearest_available_cpu() to take NO_CPU instead
of -1 to indicate that there is no release master.  While
NO_CPU is 0xffffffff (-1 in two's complement), we still
translate this value to -1 in case NO_CPU changes.

Signed-off-by: Andrea Bastoni <bastoni@cs.unc.edu>

1 files changed, 8 insertions, 7 deletions

diff --git a/include/litmus/affinity.h b/include/litmus/affinity.h
index 5eee0eaa170d..ca2e442eb547 100644
--- a/include/litmus/affinity.h
+++ b/include/litmus/affinity.h
@@ -24,12 +24,12 @@ void init_topology(void); /* called by Litmus module's _init_litmus() */
 
 /* Works like:
 void get_nearest_available_cpu(
-        cpu_entry_t* nearest,
-        cpu_entry_t* start,
-        cpu_entry_t* entries,
+        cpu_entry_t **nearest,
+        cpu_entry_t *start,
+        cpu_entry_t *entries,
         int release_master)
 
-Set release_master = -1 for no RM.
+Set release_master = NO_CPU for no Release Master.
 
 We use a macro here to exploit the fact that C-EDF and G-EDF
 have similar structures for their cpu_entry_t structs, even though
@@ -48,13 +48,14 @@ dissertation.)
         } else { \
                 int __level; \
                 int __cpu; \
-                struct neighborhood* __neighbors = &neigh_info[(start)->cpu]; \
+                int __release_master = ((release_master) == NO_CPU) ? -1 : (release_master); \
+                struct neighborhood *__neighbors = &neigh_info[(start)->cpu]; \
                 \
                 for (__level = 0; (__level < NUM_CACHE_LEVELS) && !(nearest); ++__level) { \
                         if (__neighbors->size[__level] > 1) { \
                                 for_each_cpu(__cpu, __neighbors->neighbors[__level]) { \
-                                        if (__cpu != (release_master)) { \
-                                                cpu_entry_t* __entry = &per_cpu((entries), __cpu); \
+                                        if (__cpu != __release_master) { \
+                                                cpu_entry_t *__entry = &per_cpu((entries), __cpu); \
                                                 if (!__entry->linked) { \
                                                         (nearest) = __entry; \
                                                         break; \