linux-kernel - Re: [PATCH 1/1] fs: debugfs: fix build error at powerpc platform

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Date:   Sat, 30 Sep 2023 17:04:31 -0400
From:   Frank Li <Frank.li@....com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     vkoul@...nel.org, bhe@...hat.com, dmaengine@...r.kernel.org,
        imx@...ts.linux.dev, linux-kernel@...r.kernel.org, lkp@...el.com,
        oe-kbuild-all@...ts.linux.dev, rafael@...nel.org
Subject: Re: [PATCH 1/1] fs: debugfs: fix build error at powerpc platform

On Sat, Sep 30, 2023 at 09:11:04AM +0200, Greg KH wrote:
> On Fri, Sep 29, 2023 at 12:49:20PM -0400, Frank Li wrote:
> >    ld: fs/debugfs/file.o: in function `debugfs_print_regs':
> >    file.c:(.text+0x95a): undefined reference to `ioread64be'
> > >> ld: file.c:(.text+0x9dd): undefined reference to `ioread64'
> > 
> > Reported-by: kernel test robot <lkp@...el.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202309291322.3pZiyosI-lkp@intel.com/
> > Signed-off-by: Frank Li <Frank.Li@....com>
> 
> What commit id does this fix?

In dmaengine tree https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git/log/?h=next

commit 09289d0ad1226c4735f8d9f68c9c3e54cbaba3d4
Author: Frank Li <Frank.Li@....com>
Date:   Thu Sep 21 11:01:42 2023 -0400

    debugfs_create_regset32() support 8/16/64 bit width registers


> 
> > ---
> >  fs/debugfs/file.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
> > index 5b8d4fd7c747..b406283806d9 100644
> > --- a/fs/debugfs/file.c
> > +++ b/fs/debugfs/file.c
> > @@ -1179,7 +1179,7 @@ void debugfs_print_regs(struct seq_file *s, const struct debugfs_reg *regs,
> >  			seq_printf(s, "%s = 0x%04x\n", regs->name,
> >  				  b ? ioread16be(reg) : ioread16(reg));
> >  			break;
> > -#ifdef CONFIG_64BIT
> > +#if defined(ioread64) && defined (ioread64be)
> 
> Are you sure this is equivalent?  What if these are functions?

Just dump 64bit register value. I am not sure why powerpc have not
implement this function with CONFIG_64BIT.

in io.h

#ifndef ioread64
#define ioread64 ioread64
...
#endif

I think it is better why to check if ioread64 exist.

Frank


> 
> thanks,
> 
> greg k-h