linux-kernel - RE: [PATCH 1/1] hexagon: Don't select GENERIC_IOMAP without HAS

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Date: Wed, 3 Apr 2024 15:37:17 +0000
From: Brian Cain <bcain@...cinc.com>
To: Niklas Schnelle <schnelle@...ux.ibm.com>
CC: "linux-hexagon@...r.kernel.org" <linux-hexagon@...r.kernel.org>,
        Arnd
 Bergmann <arnd@...nel.org>, Heiko Carstens <hca@...ux.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] hexagon: Don't select GENERIC_IOMAP without
 HAS_IOPORT support



> -----Original Message-----
> From: Niklas Schnelle <schnelle@...ux.ibm.com>
> Sent: Wednesday, April 3, 2024 10:22 AM
> To: Brian Cain <bcain@...cinc.com>
> Cc: linux-hexagon@...r.kernel.org; Arnd Bergmann <arnd@...nel.org>;
> Heiko Carstens <hca@...ux.ibm.com>; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 1/1] hexagon: Don't select GENERIC_IOMAP without
> HAS_IOPORT support
> 
> WARNING: This email originated from outside of Qualcomm. Please be wary
> of any links or attachments, and do not enable macros.
> 
> On Wed, 2024-04-03 at 14:51 +0000, Brian Cain wrote:
> >
> > > -----Original Message-----
> > > From: Niklas Schnelle <schnelle@...ux.ibm.com>
> > > Sent: Wednesday, April 3, 2024 8:25 AM
> > > To: Brian Cain <bcain@...cinc.com>
> > > Cc: linux-hexagon@...r.kernel.org; Arnd Bergmann <arnd@...nel.org>;
> > > Heiko Carstens <hca@...ux.ibm.com>; linux-kernel@...r.kernel.org;
> Niklas
> > > Schnelle <schnelle@...ux.ibm.com>
> > > Subject: [PATCH 1/1] hexagon: Don't select GENERIC_IOMAP without
> > > HAS_IOPORT support
> > >
> > > WARNING: This email originated from outside of Qualcomm. Please be
> wary
> > > of any links or attachments, and do not enable macros.
> > >
> > > In a future patch HAS_IOPORT=n will disable inb()/outb() and friends at
> > > compile time. As hexagon does not support I/O port access it also
> > > the GENERIC_IOMAP mechanism of dynamically choosing between I/O
> port
> > > and
> > > MMIO access doesn't work so don't select it.
> > >
> > > Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> > > Signed-off-by: Arnd Bergmann <arnd@...nel.org>
> > > Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> > > ---
> > >  arch/hexagon/Kconfig | 1 -
> > >  1 file changed, 1 deletion(-)
> > >
> > > diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
> > > index e233b5efa276..5ea1bf4b7d4f 100644
> > > --- a/arch/hexagon/Kconfig
> > > +++ b/arch/hexagon/Kconfig
> > > @@ -31,7 +31,6 @@ config HEXAGON
> > >         select HAVE_ARCH_TRACEHOOK
> > >         select NEED_SG_DMA_LENGTH
> > >         select NO_IOPORT_MAP
> > > -       select GENERIC_IOMAP
> > >         select GENERIC_IOREMAP
> > >         select GENERIC_SMP_IDLE_THREAD
> > >         select STACKTRACE_SUPPORT
> >
> > Reviewed-by: Brian Cain <bcain@...cinc.com>
> >
> 
> Thanks for the R-b, which tree should take this? If you have other
> hexagon changes for v6.10 I think it would be easiest to take this
> together with those. As mentioned in the cover letter the per-subsystem

I don't have other changes planned for v6.10 but I'm happy to take the change in my tree.

> changes are all independent until HAS_IOPORT=n actually disables
> inb()/outb() which Arnd will take once all the subsystems are covered.
> 
> Thanks,
> Niklas