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Subject[PATCH v5 03/17] sched/topology: Split out SD_* flags declaration to its own file
Date
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 what is done with the syscall
table (see uapi/asm/unistd.h and sys_call_table).

The value assigned to a given SD flag now depends on the order it appears
in sd_flags.h. No change in functionality.

Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
---
include/linux/sched/sd_flags.h | 35 ++++++++++++++++++++++++++++++++++
include/linux/sched/topology.h | 26 ++++++++++++-------------
2 files changed, 48 insertions(+), 13 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..5a74751a1a83
--- /dev/null
+++ b/include/linux/sched/sd_flags.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * sched-domains (multiprocessor balancing) flag declarations.
+ */
+
+#ifndef SD_FLAG
+#error "Incorrect import of SD flags definitions"
+#endif
+
+/* Balance when about to become idle */
+SD_FLAG(SD_BALANCE_NEWIDLE)
+/* Balance on exec */
+SD_FLAG(SD_BALANCE_EXEC)
+/* Balance on fork, clone */
+SD_FLAG(SD_BALANCE_FORK)
+/* Balance on wakeup */
+SD_FLAG(SD_BALANCE_WAKE)
+/* Wake task to waking CPU */
+SD_FLAG(SD_WAKE_AFFINE)
+/* Domain members have different CPU capacities */
+SD_FLAG(SD_ASYM_CPUCAPACITY)
+/* Domain members share CPU capacity */
+SD_FLAG(SD_SHARE_CPUCAPACITY)
+/* Domain members share CPU pkg resources */
+SD_FLAG(SD_SHARE_PKG_RESOURCES)
+/* Only a single load balancing instance */
+SD_FLAG(SD_SERIALIZE)
+/* Place busy groups earlier in the domain */
+SD_FLAG(SD_ASYM_PACKING)
+/* Prefer to place tasks in a sibling domain */
+SD_FLAG(SD_PREFER_SIBLING)
+/* sched_domains of this level overlap */
+SD_FLAG(SD_OVERLAP)
+/* cross-node balancing */
+SD_FLAG(SD_NUMA)
diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index 6ec7d7c1d1e3..3e41c0401b5f 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -11,19 +11,19 @@
*/
#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_PKG_RESOURCES 0x0080 /* Domain members share CPU pkg resources */
-#define SD_SERIALIZE 0x0100 /* Only a single load balancing instance */
-#define SD_ASYM_PACKING 0x0200 /* Place busy groups earlier in the domain */
-#define SD_PREFER_SIBLING 0x0400 /* Prefer to place tasks in a sibling domain */
-#define SD_OVERLAP 0x0800 /* sched_domains of this level overlap */
-#define SD_NUMA 0x1000 /* cross-node balancing */
+/* Generate SD flag indexes */
+#define SD_FLAG(name) __##name,
+enum {
+ #include <linux/sched/sd_flags.h>
+ __SD_FLAG_CNT,
+};
+#undef SD_FLAG
+/* Generate SD flag bits */
+#define SD_FLAG(name) name = 1 << __##name,
+enum {
+ #include <linux/sched/sd_flags.h>
+};
+#undef SD_FLAG

#ifdef CONFIG_SCHED_SMT
static inline int cpu_smt_flags(void)
--
2.27.0
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