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

Lee Jones
2021-06-22T10:48:05Z

On Tue, 01 Jun 2021, Lee Jones wrote:

> On Thu, 27 May 2021, Mathias Nyman wrote:
>
> > On 26.5.2021 18.28, Lee Jones wrote:
> > > On Wed, 26 May 2021, Sergei Shtylyov wrote:
> > >
> > >> On 5/26/21 5:44 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@intel.com>
> > >>>>> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > >>>>> Cc: linux-usb@vger.kernel.org
> > >>>>> Signed-off-by: Lee Jones <lee.jones@linaro.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);
> >
> > GFP_KERNEL might not be suitable for all cases.
> >
> > xhci_reserve_bandwidth() is called from xhci_configure_endpoint(), which again
> > is called from a lot of places.
> > For example from xhci_update_hub_device() which can be called with GFP_NOIO mem_flags.
>
> What do you suggest as an alternative?

Just working on rectifying this now.

Which Get Free Page flag do you suggest here please?

--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog