linux-kernel - Re: [PATCH -next] habanalabs: use GFP

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Message-ID: <20190222070450.GA22604@kroah.com>
Date:   Fri, 22 Feb 2019 08:04:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Wei Yongjun <weiyongjun1@...wei.com>
Cc:     Oded Gabbay <oded.gabbay@...il.com>, Arnd Bergmann <arnd@...db.de>,
        Omer Shpigelman <oshpigelman@...ana.ai>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH -next] habanalabs: use GFP_ATOMIC under spin lock

On Fri, Feb 22, 2019 at 05:46:01AM +0000, Wei Yongjun wrote:
> A spin lock is taken here so we should use GFP_ATOMIC.
> 
> Fixes: 0feaf86d4e69 ("habanalabs: add virtual memory and MMU modules")
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> ---
>  drivers/misc/habanalabs/memory.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/habanalabs/memory.c b/drivers/misc/habanalabs/memory.c
> index 9236e52852c6..9e3491dc3b55 100644
> --- a/drivers/misc/habanalabs/memory.c
> +++ b/drivers/misc/habanalabs/memory.c
> @@ -120,7 +120,7 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
>  
>  	spin_lock(&vm->idr_lock);
>  	handle = idr_alloc(&vm->phys_pg_pack_handles, phys_pg_pack, 1, 0,
> -				GFP_KERNEL);
> +				GFP_ATOMIC);
>  	spin_unlock(&vm->idr_lock);
>  
>  	if (handle < 0) {
> 
> 
> 

Ah, nice catch!

Oded, any objection to me taking this patch?

greg k-h