[RFC PATCH 1/3] sched/topology: Split out SD_* flags declaration to its own file

From: Valentin Schneider
Date: Wed Mar 11 2020 - 14:33:34 EST


To associate the SD flags with some metadata, we need some more structure
in the way they are declared.

Rather than shove that in a free-standing macro list, move the declaration
in a separate file that can be re-imported with different SD_FLAG
definitions. This is inspired by the syscalls numbering header.

No change in functionality.

Signed-off-by: Valentin Schneider <valentin.schneider@xxxxxxx>
---
include/linux/sched/sd_flags.h | 33 +++++++++++++++++++++++++++++++++
include/linux/sched/topology.h | 17 +++--------------
2 files changed, 36 insertions(+), 14 deletions(-)
create mode 100644 include/linux/sched/sd_flags.h

diff --git a/include/linux/sched/sd_flags.h b/include/linux/sched/sd_flags.h
new file mode 100644
index 000000000000..685bbe736945
--- /dev/null
+++ b/include/linux/sched/sd_flags.h
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sched-domains (multiprocessor balancing) flag declarations.
+ */
+
+/* Balance when about to become idle */
+SD_FLAG(SD_BALANCE_NEWIDLE, 0)
+/* Balance on exec */
+SD_FLAG(SD_BALANCE_EXEC, 1)
+/* Balance on fork, clone */
+SD_FLAG(SD_BALANCE_FORK, 2)
+/* Balance on wakeup */
+SD_FLAG(SD_BALANCE_WAKE, 3)
+/* Wake task to waking CPU */
+SD_FLAG(SD_WAKE_AFFINE, 4)
+/* Domain members have different CPU capacities */
+SD_FLAG(SD_ASYM_CPUCAPACITY, 5)
+/* Domain members share CPU capacity */
+SD_FLAG(SD_SHARE_CPUCAPACITY, 6)
+/* Domain members share power domain */
+SD_FLAG(SD_SHARE_POWERDOMAIN, 7)
+/* Domain members share CPU pkg resources */
+SD_FLAG(SD_SHARE_PKG_RESOURCES, 8)
+/* Only a single load balancing instance */
+SD_FLAG(SD_SERIALIZE, 9)
+/* Place busy groups earlier in the domain */
+SD_FLAG(SD_ASYM_PACKING, 10)
+/* Prefer to place tasks in a sibling domain */
+SD_FLAG(SD_PREFER_SIBLING, 11)
+/* sched_domains of this level overlap */
+SD_FLAG(SD_OVERLAP, 12)
+/* cross-node balancing */
+SD_FLAG(SD_NUMA, 13)
diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 8de2f9744569..db7d24c0174b 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -11,20 +11,9 @@
*/
#ifdef CONFIG_SMP

-#define SD_BALANCE_NEWIDLE 0x0001 /* Balance when about to become idle */
-#define SD_BALANCE_EXEC 0x0002 /* Balance on exec */
-#define SD_BALANCE_FORK 0x0004 /* Balance on fork, clone */
-#define SD_BALANCE_WAKE 0x0008 /* Balance on wakeup */
-#define SD_WAKE_AFFINE 0x0010 /* Wake task to waking CPU */
-#define SD_ASYM_CPUCAPACITY 0x0020 /* Domain members have different CPU capacities */
-#define SD_SHARE_CPUCAPACITY 0x0040 /* Domain members share CPU capacity */
-#define SD_SHARE_POWERDOMAIN 0x0080 /* Domain members share power domain */
-#define SD_SHARE_PKG_RESOURCES 0x0100 /* Domain members share CPU pkg resources */
-#define SD_SERIALIZE 0x0200 /* Only a single load balancing instance */
-#define SD_ASYM_PACKING 0x0400 /* Place busy groups earlier in the domain */
-#define SD_PREFER_SIBLING 0x0800 /* Prefer to place tasks in a sibling domain */
-#define SD_OVERLAP 0x1000 /* sched_domains of this level overlap */
-#define SD_NUMA 0x2000 /* cross-node balancing */
+#define SD_FLAG(name, idx) static const unsigned int name = BIT(idx);
+#include <linux/sched/sd_flags.h>
+#undef SD_FLAG

#ifdef CONFIG_SCHED_SMT
static inline int cpu_smt_flags(void)
--
2.24.0