linux-kernel - Re: 2.6.21-rc2-mm1: what about CONFIG_NO_HZ and !CONFIG

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Date:	Fri, 02 Mar 2007 22:12:25 +0100
From:	Laurent Riffard <laurent.riffard@...e.fr>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>
Subject: Re: 2.6.21-rc2-mm1: what about CONFIG_NO_HZ and !CONFIG_SMP ?

Le 02.03.2007 12:00, Andrew Morton a écrit :
> Temporarily at
> 
>   http://userweb.kernel.org/~akpm/2.6.21-rc2-mm1/
> 
> Will appear later at
> 
>   ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21-rc2/2.6.21-rc2-mm1/

Got this when CONFIG_NO_HZ=y and CONFIG_SMP=n:

  CC      kernel/sched.o
kernel/sched.c: In function 'trigger_load_balance':
kernel/sched.c:3384: error: 'struct rq' has no member named 'in_nohz_recently'
kernel/sched.c:3384: error: 'struct rq' has no member named 'idle_at_tick'
kernel/sched.c:3385: error: 'struct rq' has no member named 'in_nohz_recently'
kernel/sched.c:3387: error: 'nohz' undeclared (first use in this function)
kernel/sched.c:3387: error: (Each undeclared identifier is reported only once
kernel/sched.c:3387: error: for each function it appears in.)
kernel/sched.c:3404: warning: implicit declaration of function 'resched_cpu'
kernel/sched.c:3412: error: 'struct rq' has no member named 'idle_at_tick'
kernel/sched.c:3422: error: 'struct rq' has no member named 'idle_at_tick'
make[1]: *** [kernel/sched.o] Error 1
make: *** [kernel] Error 2

Looking at kernel/sched.c, it seems CONFIG_NO_HZ should depend on CONFIG_SMP...

 238 struct rq {
 239         spinlock_t lock;
 240 
 241         /*
 242          * nr_running and cpu_load should be in the same cacheline because
 243          * remote CPUs use both these fields when doing load calculation.
 244          */
 245         unsigned long nr_running;
 246         unsigned long raw_weighted_load;
 247 #ifdef CONFIG_SMP
 248         unsigned long cpu_load[3];
 249         unsigned char idle_at_tick;
 250 #ifdef CONFIG_NO_HZ
 251         unsigned char in_nohz_recently;
 252 #endif
 253 #endif
 254         unsigned long long nr_switches;

~~
laurent

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