linux-kernel - Re: [PATCH]->[PATCH v2] kgdb: Removed kmalloc returned value cast

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Date:	Mon, 11 Mar 2013 09:33:34 +0800
From:	"tiejun.chen" <tiejun.chen@...driver.com>
To:	Alex Grad <alex.grad@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jason Wessel <jason.wessel@...driver.com>
CC:	<penberg@...nel.org>, <paulus@...ba.org>, <mikey@...ling.org>,
	<jason.wessel@...driver.com>, <sfr@...b.auug.org.au>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<daniel.baluta@...il.com>
Subject: Re: [PATCH]->[PATCH v2] kgdb: Removed kmalloc returned value cast

On 03/11/2013 06:39 AM, Alex Grad wrote:
> While at it, check kmalloc return value.
>
> Signed-off-by: Alex Grad <alex.grad@...il.com>
> ---
>   arch/powerpc/kernel/kgdb.c |    5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
> index 5ca82cd..9e81dd8 100644
> --- a/arch/powerpc/kernel/kgdb.c
> +++ b/arch/powerpc/kernel/kgdb.c
> @@ -159,7 +159,10 @@ static int kgdb_singlestep(struct pt_regs *regs)
>   	if (user_mode(regs))
>   		return 0;
>
> -	backup_current_thread_info = (struct thread_info *)kmalloc(sizeof(struct thread_info), GFP_KERNEL);
> +	backup_current_thread_info = kmalloc(sizeof(struct thread_info), GFP_KERNEL);
> +	if (!backup_current_thread_info)
> +		return -ENOMEM;

I already send a kgdb patchset in "[v3][PATCH 6/6] powerpc/kgdb: remove copying 
the thread_info" to remove these stuff since its unnecessary to copy current 
thread_info now.

Tiejun
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