linux-kernel - Re: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport

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Date:   Wed, 29 Nov 2023 16:45:24 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "David E. Box" <david.e.box@...ux.intel.com>
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        schnelle@...ux.ibm.com, LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org, rajvi.jingar@...ux.intel.com,
        dave.hansen@...ux.intel.com, peterz@...radead.org
Subject: Re: [PATCH V5 12/20] asm-generic/io.h: iounmap/ioport_unmap
 cleanup.h support

On 11/27/23 at 05:55pm, David E. Box wrote:
> +Baoquan for ioremap question.
> 
> On Thu, 2023-11-23 at 16:30 +0200, Ilpo Järvinen wrote:
> > On Wed, 22 Nov 2023, David E. Box wrote:
> > 
> > > Add auto-release cleanups for iounmap() and ioport_unmap().
> > > 
> > > Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> > > Suggested-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> > > ---
> > > V2 - Move from linux/io.h to asm-generic/io.h. Adds iounmap cleanup if
> > >      iounmap() is defined. Adds ioport_unmap cleanup if CONFIG_IOPORT_MAP
> > >      is defined.
> > > 
> > >  include/asm-generic/io.h | 6 ++++++
> > >  1 file changed, 6 insertions(+)
> > > 
> > > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> > > index bac63e874c7b..9ef0332490b1 100644
> > > --- a/include/asm-generic/io.h
> > > +++ b/include/asm-generic/io.h
> > > @@ -8,6 +8,7 @@
> > >  #define __ASM_GENERIC_IO_H
> > >  
> > >  #include <asm/page.h> /* I/O is all done through memory accesses */
> > > +#include <linux/cleanup.h>
> > >  #include <linux/string.h> /* for memset() and memcpy() */
> > >  #include <linux/types.h>
> > >  #include <linux/instruction_pointer.h>
> > > @@ -1065,6 +1066,10 @@ static inline void __iomem *ioremap(phys_addr_t addr,
> > > size_t size)
> > >  #endif
> > >  #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
> > >  
> > > +#ifdef iounmap
> > > +DEFINE_FREE(iounmap, void __iomem *, iounmap(_T));
> > > +#endif
> 
> Baoquan, LKP is reporting an undeclared function 'iounmap' error with the above
> change from this patch when building for s390 with PCI disabled. The ioremap
> defines in arch/s390/include/asm/io.h are not wrapped under the #ifdef
> CONFIG_PCI block. Shouldn't they be since the s390 Kconfig only adds
> GENERIC_IOREMAP if PCI?

Sorry, almost forget this mail. Will check and reply later.

> 
> https://lore.kernel.org/oe-kbuild-all/202311241214.jcL84du7-lkp@intel.com
> 
> 
> Note that the report includes pointer arithmetic warnings that are not related
> to this patch. Those warnings occur in mainline as well.
> 
> David
> 
> > > +
> > >  #ifndef ioremap_wc
> > >  #define ioremap_wc ioremap
> > >  #endif
> > > @@ -1127,6 +1132,7 @@ static inline void ioport_unmap(void __iomem *p)
> > >  extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
> > >  extern void ioport_unmap(void __iomem *p);
> > >  #endif /* CONFIG_GENERIC_IOMAP */
> > > +DEFINE_FREE(ioport_unmap, void __iomem *, ioport_unmap(_T));
> > >  #endif /* CONFIG_HAS_IOPORT_MAP */
> > >  
> > >  #ifndef CONFIG_GENERIC_IOMAP
> > 
> > Has this now built successfully with LKP? (I don't think we get success 
> > notifications from LKP for patch submissions, only failures).
> > 
> > There were some odd errors last time but I think all they were unrelated 
> > to this change (besides the checkpatch false positive, I mean).
> > 
>