linux-kernel - Re: [PATCH v2] usb: core: warn if a GFP zone flag is passed to hcd_buffer

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Message-ID: <2025041035-catchable-stopping-e345@gregkh>
Date: Thu, 10 Apr 2025 08:10:02 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Petr Tesařík <petr@...arici.cz>
Cc: Petr Tesarik <ptesarik@...e.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usb: core: warn if a GFP zone flag is passed to
 hcd_buffer_alloc()

On Wed, Apr 09, 2025 at 05:40:36PM +0200, Petr Tesařík wrote:
> On Tue, 25 Mar 2025 14:40:00 +0100
> Petr Tesarik <ptesarik@...e.com> wrote:
> 
> > Remove a misleading comment and issue a warning if a zone modifier is
> > specified when allocating a hcd buffer.
> > 
> > There is no valid use case for a GFP zone modifier in hcd_buffer_alloc():
> > - PIO mode can use any kernel-addressable memory
> > - dma_alloc_coherent() ignores memory zone bits
> > 
> > This function is called by usb_alloc_coherent() and indirectly by
> > usb_submit_urb(). Despite the comment, no in-tree users currently pass
> > GFP_DMA.
> > 
> > Signed-off-by: Petr Tesarik <ptesarik@...e.com>
> 
> I know this was posted during the merge window, but that's now over.
> Any comment on this patch?

Please give me a chance to catch up, it's been non-stop conference
travel during the merge window, and through this week :(

thanks,

greg k-h