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Message-Id: <20231108125843.3806765-8-arnd@kernel.org>
Date: Wed, 8 Nov 2023 13:58:28 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org,
Masahiro Yamada <masahiroy@...nel.org>,
linux-kbuild@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>, Matt Turner <mattst88@...il.com>,
Vineet Gupta <vgupta@...nel.org>,
Russell King <linux@...linux.org.uk>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Guo Ren <guoren@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ard Biesheuvel <ardb@...nel.org>,
Huacai Chen <chenhuacai@...nel.org>,
Greg Ungerer <gerg@...ux-m68k.org>,
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Subject: [PATCH 07/22] [RESEND] sched: fair: move unused stub functions to header
From: Arnd Bergmann <arnd@...db.de>
These four functions have a normal definition for CONFIG_FAIR_GROUP_SCHED,
and empty one that is only referenced when FAIR_GROUP_SCHED is disabled
but CGROUP_SCHED is still enabled. If both are turned off, the functions
are still defined but the misisng prototype causes a W=1 warning:
kernel/sched/fair.c:12544:6: error: no previous prototype for 'free_fair_sched_group'
kernel/sched/fair.c:12546:5: error: no previous prototype for 'alloc_fair_sched_group'
kernel/sched/fair.c:12553:6: error: no previous prototype for 'online_fair_sched_group'
kernel/sched/fair.c:12555:6: error: no previous prototype for 'unregister_fair_sched_group'
Move the alternatives into the header as static inline functions with
the correct combination of #ifdef checks to avoid the warning without
adding even more complexity.
[A different patch with the same description got applied by accident
and was later reverted, but the original patch is still missing]
Fixes: 7aa55f2a5902 ("sched/fair: Move unused stub functions to header")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
A patch with the same commit log has
---
kernel/sched/fair.c | 13 -------------
kernel/sched/sched.h | 11 +++++++++++
2 files changed, 11 insertions(+), 13 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2048138ce54b..82b82fa1d81b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -12927,19 +12927,6 @@ int sched_group_set_idle(struct task_group *tg, long idle)
return 0;
}
-#else /* CONFIG_FAIR_GROUP_SCHED */
-
-void free_fair_sched_group(struct task_group *tg) { }
-
-int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
-{
- return 1;
-}
-
-void online_fair_sched_group(struct task_group *tg) { }
-
-void unregister_fair_sched_group(struct task_group *tg) { }
-
#endif /* CONFIG_FAIR_GROUP_SCHED */
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 2e5a95486a42..8f5df5250b8d 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -436,10 +436,21 @@ static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
extern int tg_nop(struct task_group *tg, void *data);
+#ifdef CONFIG_FAIR_GROUP_SCHED
extern void free_fair_sched_group(struct task_group *tg);
extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent);
extern void online_fair_sched_group(struct task_group *tg);
extern void unregister_fair_sched_group(struct task_group *tg);
+#else
+static inline void free_fair_sched_group(struct task_group *tg) { }
+static inline int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
+{
+ return 1;
+}
+static inline void online_fair_sched_group(struct task_group *tg) { }
+static inline void unregister_fair_sched_group(struct task_group *tg) { }
+#endif
+
extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
struct sched_entity *se, int cpu,
struct sched_entity *parent);
--
2.39.2
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