linux-kernel - Re: [PATCH] kernel/events: using uninitialized variable: slots.flexible for arm cross-compiling

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Date:	Wed, 06 Feb 2013 16:25:31 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...stprotocols.net
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/events: using uninitialized variable: slots.flexible
 for arm cross-compiling


  oh, sorry, it is my fault, please skip this patch.

gchen.

于 2013年02月06日 15:53, Chen Gang 写道:
> 
> for arm cross-compiling, in function __reserve_bp_slot:
> 
>   slots.flexible may be used without initializing.
> 
>     slots.flexible is not initialized when define it.
>     it is as a parameter passed to fetch_bp_busy_slots.
>     in function fetch_bp_busy_slots:
>       if bp->cpu < 0
>         slots->flexible will be used for comparing, firstly.
>         that will cause issue.
> 
> 
> building:
>   make EXTRA_CFLAGS=-W ARCH=arm
>   ...
>   linux/kernel/events/hw_breakpoint.c:300:
>     warning: missing initializer
>   linux/kernel/events/hw_breakpoint.c:300:
>     warning: (near initialization for 'slots.flexible')
>   ...
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/events/hw_breakpoint.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
> index fe8a916..ef69215 100644
> --- a/kernel/events/hw_breakpoint.c
> +++ b/kernel/events/hw_breakpoint.c
> @@ -297,7 +297,7 @@ __weak void arch_unregister_hw_breakpoint(struct perf_event *bp)
>   */
>  static int __reserve_bp_slot(struct perf_event *bp)
>  {
> -	struct bp_busy_slots slots = {0};
> +	struct bp_busy_slots slots = {0, 0};
>  	enum bp_type_idx type;
>  	int weight;
>  
> 


-- 
Chen Gang

Asianux Corporation
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