linux-kernel - Re: [PATCH] ARM: xen: unexport HYPERVISOR_platform

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Date:   Tue, 1 Oct 2019 10:38:03 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Denis Efremov <efremov@...ux.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Russell King <linux@...linux.org.uk>,
        xen-devel@...ts.xenproject.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com
Subject: Re: [PATCH] ARM: xen: unexport HYPERVISOR_platform_op function

On Fri, 6 Sep 2019, Arnd Bergmann wrote:
> HYPERVISOR_platform_op() is an inline function and should not
> be exported. Since commit 15bfc2348d54 ("modpost: check for
> static EXPORT_SYMBOL* functions"), this causes a warning:
> 
> WARNING: "HYPERVISOR_platform_op" [vmlinux] is a static EXPORT_SYMBOL_GPL
> 
> Remove the extraneous export.
> 
> Fixes: 15bfc2348d54 ("modpost: check for static EXPORT_SYMBOL* functions")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm/xen/enlighten.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index 1e57692552d9..845c528acf24 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -437,7 +437,6 @@ EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
>  EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
>  EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
>  EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
> -EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
>  EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
>  EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
>  EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);

Hi Arnd, 

Thank you for the patch. HYPERVISOR_platform_op() is an inline function,
the underlying function that should be exported is
HYPERVISOR_platform_op_raw. So, instead of removing
HYPERVISOR_platform_op, we should change it to
HYPERVISOR_platform_op_raw.

For convenience, and for testing I cooked up a patch. Arnd, if you are
happy with it (in the sense that it solves your problem) we'll check it
in the xentip tree, unless you would like to get it in your tree?

Cheers,

Stefano

---

From: Stefano Stabellini <stefano.stabellini@...inx.com>

HYPERVISOR_platform_op() is an inline function and should not
be exported. Since commit 15bfc2348d54 ("modpost: check for
static EXPORT_SYMBOL* functions"), this causes a warning:

WARNING: "HYPERVISOR_platform_op" [vmlinux] is a static EXPORT_SYMBOL_GPL

Instead, export the underlying function called by the static inline:
HYPERVISOR_platform_op_raw.

Fixes: 15bfc2348d54 ("modpost: check for static EXPORT_SYMBOL* functions")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Stefano Stabellini <stefano.stabellini@...inx.com>

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 1e57692552d9..522c97d43ef8 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -437,7 +437,7 @@ EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
 EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
-EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
+EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
 EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
 EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);