core: add support for setting CPUAffinity= to special "numa" value

systemd will automatically derive CPU affinity mask from NUMA node
mask.

Fixes #13248

src/shared/bus-unit-util.c

@@ -29,6 +29,7 @@
 #include "signal-util.h"
 #include "socket-util.h"
 #include "sort-util.h"
+#include "stdio-util.h"
 #include "string-util.h"
 #include "syslog-util.h"
 #include "terminal-util.h"
@@ -1103,6 +1104,13 @@ static int bus_append_execute_property(sd_bus_message *m, const char *field, con
                 _cleanup_free_ uint8_t *array = NULL;
                 size_t allocated;
 
+                if (eq && streq(eq, "numa")) {
+                        r = sd_bus_message_append(m, "(sv)", "CPUAffinityFromNUMA", "b", true);
+                        if (r < 0)
+                                return bus_log_create_error(r);
+                        return r;
+                }
+
                 r = parse_cpu_set(eq, &cpuset);
                 if (r < 0)
                         return log_error_errno(r, "Failed to parse %s value: %s", field, eq);

src/shared/cpu-set-util.c

@@ -131,7 +131,7 @@ int cpu_set_add_all(CPUSet *a, const CPUSet *b) {
                                 return r;
                 }
 
-        return 0;
+        return 1;
 }
 
 int parse_cpu_set_full(
@@ -216,7 +216,7 @@ int parse_cpu_set_extend(
         if (!old->set) {
                 *old = cpuset;
                 cpuset = (CPUSet) {};
-                return 0;
+                return 1;
         }
 
         return cpu_set_add_all(old, &cpuset);