linux-kernel - RE: [PATCH v7 09/10] arm64: efi: Export screen

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Message-ID: <MW2PR2101MB1052C68771718B3FB47BB58BD7560@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Mon, 24 Aug 2020 17:40:32 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "will@...nel.org" <will@...nel.org>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "Mark.Rutland@....com" <Mark.Rutland@....com>,
        "maz@...nel.org" <maz@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        vkuznets <vkuznets@...hat.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        "boqun.feng@...il.com" <boqun.feng@...il.com>
Subject: RE: [PATCH v7 09/10] arm64: efi: Export screen_info

From: Greg KH <gregkh@...uxfoundation.org> Sent: Monday, August 24, 2020 10:35 AM
> 
> On Mon, Aug 24, 2020 at 09:46:22AM -0700, Michael Kelley wrote:
> > The Hyper-V frame buffer driver may be built as a module, and
> > it needs access to screen_info. So export screen_info.
> >
> > Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
> > ---
> >  arch/arm64/kernel/efi.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
> > index d0cf596..8ff557a 100644
> > --- a/arch/arm64/kernel/efi.c
> > +++ b/arch/arm64/kernel/efi.c
> > @@ -55,6 +55,7 @@ static __init pteval_t
> create_mapping_protection(efi_memory_desc_t *md)
> >
> >  /* we will fill this structure from the stub, so don't put it in .bss */
> >  struct screen_info screen_info __section(.data);
> > +EXPORT_SYMBOL(screen_info);
> 
> EXPORT_SYMBOL_GPL()?
> 
> I have to ask :)

It's also just EXPORT_SYMBOL(screen_info) in the x86, PowerPC, and Alpha
architectures. I know that doesn't guarantee it's right, but I'll have to defer
to the appropriate subsystem maintainers for whether it really should be
EXPORT_SYMBOL_GPL.

Michael

> 
> thanks,
> 
> greg k-h