linux-kernel - Re: [PATCH v2 0/6] sched: expel confusing usage of the term "power"

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Message-ID: <20140605100905.GA24275@gmail.com>
Date:	Thu, 5 Jun 2014 12:09:05 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Morten Rasmussen <morten.rasmussen@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH v2 0/6] sched: expel confusing usage of the term "power"


So I'm hijacking this thread a bit to report a bug in the following 
patch:

Author: Daniel Lezcano <daniel.lezcano@...aro.org>
Date:   Tue Jun 3 14:59:05 2014 +0200

    sched: Move enum CPU_[xxx_]IDLE to private sched.h
    
    The different enum CPU_IDLE, CPU_NOT_IDLE, CPU_NEWLY_IDLE and
    CPU_MAX_IDLE_TYPES are only used in kernel/sched/fair.c and
    kernel/sched/stats.c.

on x86-64 defconfig it fails to build with:

In file included from 
/home/mingo/tip/arch/x86/kernel/asm-offsets.c:9:0:
/home/mingo/tip/include/linux/sched.h:939:24: error: 
‘CPU_MAX_IDLE_TYPES’ undeclared here (not in a function)
  unsigned int lb_count[CPU_MAX_IDLE_TYPES];
                        ^
make[2]: *** [arch/x86/kernel/asm-offsets.s] Error 1
make[1]: *** [prepare0] Error 2
make: *** [sub-make] Error 2

Find below the version that came to me.

Thanks,

	Ingo

===========================>
>From 21e0efe63f6766fc9b685ca8d5744101f9a21270 Mon Sep 17 00:00:00 2001
From: Daniel Lezcano <daniel.lezcano@...aro.org>
Date: Tue, 3 Jun 2014 14:59:05 +0200
Subject: [PATCH] sched: Move enum CPU_[xxx_]IDLE to private sched.h

The different enum CPU_IDLE, CPU_NOT_IDLE, CPU_NEWLY_IDLE and
CPU_MAX_IDLE_TYPES are only used in kernel/sched/fair.c and
kernel/sched/stats.c.

Move their definitions in the private 'sched.h' file located in the
same place than the files above.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1401800345-29468-1-git-send-email-daniel.lezcano@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/sched.h | 7 -------
 kernel/sched/sched.h  | 7 +++++++
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index ce93768..b313c2e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -846,13 +846,6 @@ static inline int sched_info_on(void)
 #endif
 }
 
-enum cpu_idle_type {
-	CPU_IDLE,
-	CPU_NOT_IDLE,
-	CPU_NEWLY_IDLE,
-	CPU_MAX_IDLE_TYPES
-};
-
 /*
  * Increase resolution of cpu_capacity calculations
  */
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 956b8ca..9ab7d95 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -23,6 +23,13 @@ extern atomic_long_t calc_load_tasks;
 extern long calc_load_fold_active(struct rq *this_rq);
 extern void update_cpu_load_active(struct rq *this_rq);
 
+enum cpu_idle_type {
+	CPU_IDLE,
+	CPU_NOT_IDLE,
+	CPU_NEWLY_IDLE,
+	CPU_MAX_IDLE_TYPES
+};
+
 /*
  * Helpers for converting nanosecond timing to jiffy resolution
  */

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