linux-kernel - [BUG linux-next] watchdog: build breakage for non-SMP builds

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Date:	Wed, 7 Aug 2013 09:44:42 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	Michal Hocko <mhocko@...e.cz>, Don Zickus <dzickus@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [BUG linux-next] watchdog: build breakage for non-SMP builds

Hi,

commit 0ce6966b "watchdog: update watchdog_tresh properly" breaks
build on non-SMP systems (more specifically: on systems where
CONFIG_USE_GENERIC_SMP_HELPERS is not set):
linux-next/kernel/watchdog.c: In function 'update_timers':
linux-next/kernel/watchdog.c:522:2: error: implicit declaration of function '__smp_call_function_single' [-Werror=implicit-function-declaration]

I guess the offending code should be guarded by an
'#ifdef CONFIG_USE_GENERIC_SMP_HELPERS'
like in kernel/softirq.c:
#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
[...]
static int __try_remote_softirq(struct call_single_data *cp, int cpu, int softirq)
{
        if (cpu_online(cpu)) {
                cp->func = remote_softirq_receive;
                cp->info = &softirq;
                cp->flags = 0;

                __smp_call_function_single(cpu, cp, 0);
                return 0;
        }
        return 1;
}
#else /* CONFIG_USE_GENERIC_SMP_HELPERS */
static int __try_remote_softirq(struct call_single_data *cp, int cpu, int softirq)
{
        return 1;
}
#endif


Lothar Waßmann
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