linux-kernel - Re: [PATCH 21/24] usb: host: xhci: Move array of structs from the stack onto the heap

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Date:   Wed, 26 May 2021 17:21:22 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 21/24] usb: host: xhci: Move array of structs from the
 stack onto the heap

On 5/26/21 4:00 PM, Lee Jones wrote:

> Fixes the following W=1 kernel build warning(s):
> 
>  drivers/usb/host/xhci.c: In function ‘xhci_reserve_bandwidth’:
>  drivers/usb/host/xhci.c:2859:1: warning: the frame size of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> Cc: Mathias Nyman <mathias.nyman@...el.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-usb@...r.kernel.org
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/usb/host/xhci.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index ac2a7d4288883..40ce4b4eb12ad 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
[...]
> @@ -2788,6 +2788,10 @@ static int xhci_reserve_bandwidth(struct xhci_hcd *xhci,
>  		return -ENOMEM;
>  	}
>  
> +	ep_bw_info = kzalloc(sizeof(*ep_bw_info) * 31, GFP_KERNEL);

   Why not kcalloc()?

[...]

MBR, Sergei