lkml.org 
[lkml]   [2018]   [Sep]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
SubjectRe: [PATCH] PCI: kirin: Fix section mismatch warning
On Wed, Sep 19, 2018 at 3:29 AM Lorenzo Pieralisi
<lorenzo.pieralisi@arm.com> wrote:
>
> Xiaowei, Binghui,
>
> On Tue, Sep 18, 2018 at 10:38:29PM -0700, Nathan Chancellor wrote:
> > WARNING: vmlinux.o(.text+0x4758cc): Section mismatch in reference from
> > the function kirin_pcie_probe() to the function
> > .init.text:kirin_add_pcie_port()
> > The function kirin_pcie_probe() references
> > the function __init kirin_add_pcie_port().
> > This is often because kirin_pcie_probe lacks a __init
> > annotation or the annotation of kirin_add_pcie_port is wrong.
> >
> > Remove '__init' from kirin_add_pcie_port so there is no mismatch.
>
> I think that instead of removing __init section tag we should add
> it to kirin_pcie_probe().

A bunch of these functions have a single call site, with a mix of __init:

kirin_pcie_probe() ->
kirin_add_pcie_port() -> // __init
kirin_pcie_add_msi()

But it looks like probe functions should be marked init:
$ cd drivers; grep -r __init | grep probe

seems to turn up quite a lot of *probe() functions that are marked __init.
https://www.tldp.org/LDP/lkmpg/2.4/html/x281.htm has more info, and
from reading that, it seems that it's a no-op for a module that's
marked loadable.

So I agree; __init should be added to kirin_pcie_probe(), but also
kirin_pcie_add_msi(). That way if the module is statically compiled
into the kernel image, these functions with a single call site get
cleaned up after init.

Nathan, would you mind sending a v2?

>
> Please let me know and ACK accordingly.
>
> Lorenzo
>
> > Fixes: fc5165db245a ("PCI: kirin: Add HiSilicon Kirin SoC PCIe controller driver")
> > Reported-by: Nick Desaulniers <ndesaulniers@google.com>
> > Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
> > ---
> > drivers/pci/controller/dwc/pcie-kirin.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
> > index 5352e0c3be82..9b599296205d 100644
> > --- a/drivers/pci/controller/dwc/pcie-kirin.c
> > +++ b/drivers/pci/controller/dwc/pcie-kirin.c
> > @@ -467,8 +467,8 @@ static int kirin_pcie_add_msi(struct dw_pcie *pci,
> > return 0;
> > }
> >
> > -static int __init kirin_add_pcie_port(struct dw_pcie *pci,
> > - struct platform_device *pdev)
> > +static int kirin_add_pcie_port(struct dw_pcie *pci,
> > + struct platform_device *pdev)
> > {
> > int ret;
> >
> > --
> > 2.19.0
> >



--
Thanks,
~Nick Desaulniers

\
 
 \ /
  Last update: 2018-09-19 19:37    [W:0.051 / U:12.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site