linux-kernel - Re: [PATCH] kernel/async.c: fixing compilation warnings

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Date:	Fri, 14 Jan 2011 09:18:56 +0000
From:	Jack Stone <jwjstone@...tmail.fm>
To:	Viresh Kumar <viresh.kumar@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/async.c: fixing compilation warnings

"Viresh Kumar" <viresh.kumar@...com> wrote:

>This patch fixes following compilation warnings:
>270:10: warning: ‘starttime.tv64’ may be used uninitialized in this
>function
>122:10: warning: ‘calltime.tv64’ may be used uninitialized in this
>function
>
>Signed-off-by: Viresh Kumar <viresh.kumar@...com>
>---
> kernel/async.c |    4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
>diff --git a/kernel/async.c b/kernel/async.c
>index cd9dbb9..9c06931 100644
>--- a/kernel/async.c
>+++ b/kernel/async.c
>@@ -119,7 +119,7 @@ static void async_run_entry_fn(struct work_struct
>*work)
> 	struct async_entry *entry =
> 		container_of(work, struct async_entry, work);
> 	unsigned long flags;
>-	ktime_t calltime, delta, rettime;
>+	ktime_t calltime = {0}, delta, rettime;

I think this is a false positive so we can use uninitalized_var().

> 	/* 1) move self to the running queue */
> 	spin_lock_irqsave(&async_lock, flags);
>@@ -267,7 +267,7 @@ EXPORT_SYMBOL_GPL(async_synchronize_full_domain);
> void async_synchronize_cookie_domain(async_cookie_t cookie,
> 				     struct list_head *running)
> {
>-	ktime_t starttime, delta, endtime;
>+	ktime_t starttime = {0}, delta, endtime;
> 

Same for this one.

> 	if (initcall_debug && system_state == SYSTEM_BOOTING) {
> 		printk("async_waiting @ %i\n", task_pid_nr(current));

Thanks,

Jack


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