linux-kernel - Re: [PATCH v2 2/3] memory: export symbols for memory related functions

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Date:   Wed, 14 Jun 2023 09:59:27 +0000
From:   Wei-chin Tsai (蔡維晉) 
        <Wei-chin.Tsai@...iatek.com>
To:     "linux@...linux.org.uk" <linux@...linux.org.uk>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mel Lee (李奇錚) <Mel.Lee@...iatek.com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        Ivan Tseng (曾志軒) 
        <ivan.tseng@...iatek.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v2 2/3] memory: export symbols for memory related
 functions

On Wed, 2023-06-14 at 08:16 +0100, Russell King (Oracle) wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On Wed, Jun 14, 2023 at 11:20:34AM +0800, Wei Chin Tsai wrote:
> > diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
> > index 0e8ff85890ad..df91412a1069 100644
> > --- a/arch/arm/kernel/process.c
> > +++ b/arch/arm/kernel/process.c
> > @@ -343,6 +343,7 @@ const char *arch_vma_name(struct vm_area_struct
> *vma)
> >  {
> >  return is_gate_vma(vma) ? "[vectors]" : NULL;
> >  }
> > +EXPORT_SYMBOL_GPL(arch_vma_name);
> ...
> > diff --git a/kernel/signal.c b/kernel/signal.c
> > index b5370fe5c198..a1abe77fcdc3 100644
> > --- a/kernel/signal.c
> > +++ b/kernel/signal.c
> > @@ -4700,6 +4700,7 @@ __weak const char *arch_vma_name(struct
> vm_area_struct *vma)
> >  {
> >  return NULL;
> >  }
> > +EXPORT_SYMBOL_GPL(arch_vma_name);
> 
> Have you confirmed:
> 1) whether this actually builds
> 2) whether this results in one or two arch_vma_name exports
> 
> ?
> 
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

Hi Russell,

We did confirm that it can be built successfully in kernel 6.1 and run
well in our system.

Actually, we only use this export symbol "arch_vma_name"
from kernel/signal.c in arm64. We also export symbol for arch_vma_name
in arch/arm/kernel/process.c because that, one day in the future,  we
are afraid that we also need this function in arm platform.

Thanks.

Regards,

Jim