linux-kernel - [PATCH v4 04/10] sched/topology: Split out SD

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Date:   Fri, 31 Jul 2020 12:54:56 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, peterz@...radead.org, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, morten.rasmussen@....com,
        Quentin Perret <qperret@...gle.com>
Subject: [PATCH v4 04/10] sched/topology: Split out SD_* flags declaration to its own file

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).

No change in functionality.

Signed-off-by: Valentin Schneider <valentin.schneider@....com>
---
 include/linux/sched/sd_flags.h | 31 +++++++++++++++++++++++++++++++
 include/linux/sched/topology.h | 17 ++++-------------
 2 files changed, 35 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..c313291fe8bd
--- /dev/null
+++ b/include/linux/sched/sd_flags.h
@@ -0,0 +1,31 @@
+/* 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 CPU pkg resources */
+SD_FLAG(SD_SHARE_PKG_RESOURCES, 7)
+/* Only a single load balancing instance */
+SD_FLAG(SD_SERIALIZE,           8)
+/* Place busy groups earlier in the domain */
+SD_FLAG(SD_ASYM_PACKING,        9)
+/* Prefer to place tasks in a sibling domain */
+SD_FLAG(SD_PREFER_SIBLING,      10)
+/* sched_domains of this level overlap */
+SD_FLAG(SD_OVERLAP,             11)
+/* cross-node balancing */
+SD_FLAG(SD_NUMA,                12)
diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h
index c88249bed095..cf5f16fa2610 100644
--- a/include/linux/sched/topology.h
+++ b/include/linux/sched/topology.h
@@ -11,19 +11,10 @@
  */
 #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_FOO = VALUE */
+#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)
-- 
2.27.0