netdev - Re: [PATCH] xen/netback: Pass (void *) to virt_to

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Date: Fri, 26 May 2023 02:49:51 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Linus Walleij <linus.walleij@...aro.org>, Wei Liu <wei.liu@...nel.org>,
	Paul Durrant <paul@....org>, xen-devel@...ts.xenproject.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] xen/netback: Pass (void *) to virt_to_page()

On Wed, May 24, 2023 at 10:11:47PM -0700, Jakub Kicinski wrote:
> On Tue, 23 May 2023 16:03:42 +0200 Linus Walleij wrote:
> > virt_to_page() takes a virtual address as argument but
> > the driver passes an unsigned long, which works because
> > the target platform(s) uses polymorphic macros to calculate
> > the page.
> > 
> > Since many architectures implement virt_to_pfn() as
> > a macro, this function becomes polymorphic and accepts both a
> > (unsigned long) and a (void *).
> > 
> > Fix this up by an explicit (void *) cast.
> 
> Paul, Wei, looks like netdev may be the usual path for this patch 
> to flow thru, although I'm never 100% sure with Xen.

Yes. Netdev is the right path.

Thanks,
Wei.