Re: [PATCH 1/4] lib: move pci_iomap.c to drivers/pci/
From: Philipp Stanner
Date: Tue Nov 21 2023 - 05:44:45 EST
On Tue, 2023-11-21 at 12:20 +0800, kernel test robot wrote:
> Hi Philipp,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on pci/next]
> [also build test ERROR on pci/for-linus linus/master v6.7-rc2 next-
> 20231120]
> [If your patch is applied to the wrong git tree, kindly drop us a
> note.
> And when submitting patch, we suggest to use '--base' as documented
> in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:
> https://github.com/intel-lab-lkp/linux/commits/Philipp-Stanner/lib-move-pci_iomap-c-to-drivers-pci/20231121-060258
> base:
> https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
> patch link:
> https://lore.kernel.org/r/20231120215945.52027-3-pstanner%40redhat.com
> patch subject: [PATCH 1/4] lib: move pci_iomap.c to drivers/pci/
> config: openrisc-allnoconfig
> (https://download.01.org/0day-ci/archive/20231121/202311211216.KqPYvO
> CI-lkp@xxxxxxxxx/config)
> compiler: or1k-linux-gcc (GCC) 13.2.0
> reproduce (this is a W=1 build):
> (https://download.01.org/0day-ci/archive/20231121/202311211216.KqPYvO
> CI-lkp@xxxxxxxxx/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new
> version of
> the same patch/commit), kindly add following tags
> > Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > Closes:
> > https://lore.kernel.org/oe-kbuild-all/202311211216.KqPYvOCI-lkp@xxxxxxxxx/
>
> All error/warnings (new ones prefixed by >>):
>
> > > drivers/pci/iomap.c:27:15: error: redefinition of
> > > 'pci_iomap_range'
> 27 | void __iomem *pci_iomap_range(struct pci_dev *dev,
> | ^~~~~~~~~~~~~~~
> In file included from include/asm-generic/io.h:20,
> from arch/openrisc/include/asm/io.h:37,
> from include/linux/io.h:13,
> from include/linux/irq.h:20,
> from include/asm-generic/hardirq.h:17,
> from
> ./arch/openrisc/include/generated/asm/hardirq.h:1,
> from include/linux/hardirq.h:11,
> from include/linux/interrupt.h:11,
> from include/linux/pci.h:38,
> from drivers/pci/iomap.c:7:
> include/asm-generic/pci_iomap.h:44:29: note: previous definition
> of 'pci_iomap_range' with type 'void *(struct pci_dev *, int, long
> unsigned int, long unsigned int)'
> 44 | static inline void __iomem *pci_iomap_range(struct pci_dev
> *dev, int bar,
> | ^~~~~~~~~~~~~~~
> drivers/pci/iomap.c: In function 'pci_iomap_range':
> > > drivers/pci/iomap.c:43:24: error: implicit declaration of
> > > function '__pci_ioport_map'; did you mean 'devm_ioport_map'? [-
> > > Werror=implicit-function-declaration]
> 43 | return __pci_ioport_map(dev, start, len);
> | ^~~~~~~~~~~~~~~~
> | devm_ioport_map
> > > drivers/pci/iomap.c:43:24: warning: returning 'int' from a
> > > function with return type 'void *' makes pointer from integer
> > > without a cast [-Wint-conversion]
> 43 | return __pci_ioport_map(dev, start, len);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/pci/iomap.c: At top level:
> > > drivers/pci/iomap.c:67:15: error: redefinition of
> > > 'pci_iomap_wc_range'
> 67 | void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
> | ^~~~~~~~~~~~~~~~~~
> include/asm-generic/pci_iomap.h:50:29: note: previous definition
> of 'pci_iomap_wc_range' with type 'void *(struct pci_dev *, int,
> long unsigned int, long unsigned int)'
> 50 | static inline void __iomem *pci_iomap_wc_range(struct
> pci_dev *dev, int bar,
> | ^~~~~~~~~~~~~~~~~~
> > > drivers/pci/iomap.c:110:15: error: redefinition of 'pci_iomap'
> 110 | void __iomem *pci_iomap(struct pci_dev *dev, int bar,
> unsigned long maxlen)
> | ^~~~~~~~~
> include/asm-generic/pci_iomap.h:35:29: note: previous definition
> of 'pci_iomap' with type 'void *(struct pci_dev *, int, long
> unsigned int)'
> 35 | static inline void __iomem *pci_iomap(struct pci_dev *dev,
> int bar, unsigned long max)
> | ^~~~~~~~~
> > > drivers/pci/iomap.c:131:15: error: redefinition of 'pci_iomap_wc'
> 131 | void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar,
> unsigned long maxlen)
> | ^~~~~~~~~~~~
> include/asm-generic/pci_iomap.h:40:29: note: previous definition
> of 'pci_iomap_wc' with type 'void *(struct pci_dev *, int, long
> unsigned int)'
> 40 | static inline void __iomem *pci_iomap_wc(struct pci_dev
> *dev, int bar, unsigned long max)
> | ^~~~~~~~~~~~
> > > drivers/pci/iomap.c:164:6: error: redefinition of 'pci_iounmap'
> 164 | void pci_iounmap(struct pci_dev *dev, void __iomem *p)
> | ^~~~~~~~~~~
> include/asm-generic/pci_iomap.h:56:20: note: previous definition
> of 'pci_iounmap' with type 'void(struct pci_dev *, void *)'
> 56 | static inline void pci_iounmap(struct pci_dev *dev, void
> __iomem *addr)
> | ^~~~~~~~~~~
> cc1: some warnings being treated as errors
>
> Kconfig warnings: (for reference only)
> WARNING: unmet direct dependencies detected for GENERIC_PCI_IOMAP
> Depends on [n]: PCI [=n]
> Selected by [y]:
> - OPENRISC [=y]
OK, so the issue here seems to be that you can not have
GENERIC_PCI_IOMAP depend on PCI.
Previously, #ifdef CONFIG_PCI made the (in this case) redundant
function definitions disappear, which is not the case anymore for
configs that want GENERIC_PCI_IOMAP but not PCI.
My bad.
I'll address that in the next version.
P.
>
>
> vim +/pci_iomap_range +27 drivers/pci/iomap.c
>
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 11
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 12
> /**
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 13 *
> pci_iomap_range - create a virtual mapping cookie for a PCI BAR
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 14 *
> @dev: PCI device that owns the BAR
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 15 *
> @bar: BAR number
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 16 *
> @offset: map memory at the given offset in BAR
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 17 *
> @maxlen: max length of the memory to map
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 18 *
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 19 *
> Using this function you will get a __iomem address to your device
> BAR.
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 20 *
> You can access it using ioread*() and iowrite*(). These functions
> hide
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 21 *
> the details if this is a MMIO or PIO address space and will just do
> what
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 22 *
> you expect from them in the correct way.
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 23 *
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 24 *
> @maxlen specifies the maximum length to map. If you want to get
> access to
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 25 *
> the complete BAR from offset to the end, pass %0 here.
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 26 *
> */
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 @27
> void __iomem *pci_iomap_range(struct pci_dev *dev,
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29
> 28 int bar,
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29
> 29 unsigned long offset,
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29
> 30 unsigned long maxlen)
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 31 {
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 32 resource_size_t start = pci_resource_start(dev, bar);
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 33 resource_size_t len = pci_resource_len(dev, bar);
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 34 unsigned long flags = pci_resource_flags(dev, bar);
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 35
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29
> 36 if (len <= offset || !start)
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 37 return NULL;
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29
> 38 len -= offset;
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29
> 39 start += offset;
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 40 if (maxlen && len > maxlen)
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 41 len = maxlen;
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 42 if (flags & IORESOURCE_IO)
> b923650b84068b lib/pci_iomap.c Michael S. Tsirkin 2012-01-30
> @43 return __pci_ioport_map(dev, start, len);
> 92b19ff50e8f24 lib/pci_iomap.c Dan Williams 2015-08-10
> 44 if (flags & IORESOURCE_MEM)
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 45 return ioremap(start, len);
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 46 /* What? */
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24
> 47 return NULL;
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 48 }
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 49
> EXPORT_SYMBOL(pci_iomap_range);
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 50
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 51
> /**
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 52 *
> pci_iomap_wc_range - create a virtual WC mapping cookie for a PCI BAR
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 53 *
> @dev: PCI device that owns the BAR
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 54 *
> @bar: BAR number
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 55 *
> @offset: map memory at the given offset in BAR
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 56 *
> @maxlen: max length of the memory to map
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 57 *
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 58 *
> Using this function you will get a __iomem address to your device
> BAR.
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 59 *
> You can access it using ioread*() and iowrite*(). These functions
> hide
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 60 *
> the details if this is a MMIO or PIO address space and will just do
> what
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 61 *
> you expect from them in the correct way. When possible write
> combining
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 62 *
> is used.
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 63 *
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 64 *
> @maxlen specifies the maximum length to map. If you want to get
> access to
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 65 *
> the complete BAR from offset to the end, pass %0 here.
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 66 *
> */
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 @67
> void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 68 int bar,
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 69 unsigned long offset,
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 70 unsigned long maxlen)
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 71 {
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 72 resource_size_t start = pci_resource_start(dev, bar);
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 73 resource_size_t len = pci_resource_len(dev, bar);
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 74 unsigned long flags = pci_resource_flags(dev, bar);
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 75
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 76
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 77 if (flags & IORESOURCE_IO)
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 78 return NULL;
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 79
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 80 if (len <= offset || !start)
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 81 return NULL;
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 82
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 83 len -= offset;
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 84 start += offset;
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 85 if (maxlen && len > maxlen)
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 86 len = maxlen;
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 87
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 88 if (flags & IORESOURCE_MEM)
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 89 return ioremap_wc(start, len);
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 90
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 91 /* What? */
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 92 return NULL;
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 93 }
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 94
> EXPORT_SYMBOL_GPL(pci_iomap_wc_range);
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 95
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 96
> /**
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 97 *
> pci_iomap - create a virtual mapping cookie for a PCI BAR
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 98 *
> @dev: PCI device that owns the BAR
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 99 *
> @bar: BAR number
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 100 *
> @maxlen: length of the memory to map
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 101 *
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 102 *
> Using this function you will get a __iomem address to your device
> BAR.
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 103 *
> You can access it using ioread*() and iowrite*(). These functions
> hide
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 104 *
> the details if this is a MMIO or PIO address space and will just do
> what
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 105 *
> you expect from them in the correct way.
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 106 *
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 107 *
> @maxlen specifies the maximum length to map. If you want to get
> access to
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 108 *
> the complete BAR without checking for its length first, pass %0 here.
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 109 *
> */
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 @110
> void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long
> maxlen)
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 111 {
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29
> 112 return pci_iomap_range(dev, bar, 0, maxlen);
> eb29d8d2aad706 lib/pci_iomap.c Michael S. Tsirkin 2013-05-29 113 }
> 66eab4df288aae lib/pci_iomap.c Michael S. Tsirkin 2011-11-24 114
> EXPORT_SYMBOL(pci_iomap);
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 115
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 116
> /**
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 117 *
> pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 118 *
> @dev: PCI device that owns the BAR
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 119 *
> @bar: BAR number
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 120 *
> @maxlen: length of the memory to map
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 121 *
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 122 *
> Using this function you will get a __iomem address to your device
> BAR.
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 123 *
> You can access it using ioread*() and iowrite*(). These functions
> hide
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 124 *
> the details if this is a MMIO or PIO address space and will just do
> what
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 125 *
> you expect from them in the correct way. When possible write
> combining
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 126 *
> is used.
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 127 *
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 128 *
> @maxlen specifies the maximum length to map. If you want to get
> access to
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 129 *
> the complete BAR without checking for its length first, pass %0 here.
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 130 *
> */
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 @131
> void __iomem *pci_iomap_wc(struct pci_dev *dev, int bar, unsigned
> long maxlen)
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 132 {
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24
> 133 return pci_iomap_wc_range(dev, bar, 0, maxlen);
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 134 }
> 1b3d4200c1e00a lib/pci_iomap.c Luis R. Rodriguez 2015-08-24 135
> EXPORT_SYMBOL_GPL(pci_iomap_wc);
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 136
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 137 /*
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 138 *
> pci_iounmap() somewhat illogically comes from lib/iomap.c for the
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 139 *
> CONFIG_GENERIC_IOMAP case, because that's the code that knows about
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 140 *
> the different IOMAP ranges.
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 141 *
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 142 *
> But if the architecture does not use the generic iomap code, and if
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 143 *
> it has _not_ defined it's own private pci_iounmap function, we define
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 144 *
> it here.
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 145 *
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 146 *
> NOTE! This default implementation assumes that if the architecture
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 147 *
> support ioport mapping (HAS_IOPORT_MAP), the ioport mapping will
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 148 *
> be fixed to the range [ PCI_IOBASE, PCI_IOBASE+IO_SPACE_LIMIT [,
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 149 *
> and does not need unmapping with 'ioport_unmap()'.
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 150 *
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 151 *
> If you have different rules for your architecture, you need to
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 152 *
> implement your own pci_iounmap() that knows the rules for where
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 153 *
> and how IO vs MEM get mapped.
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 154 *
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 155 *
> This code is odd, and the ARCH_HAS/ARCH_WANTS #define logic comes
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 156 *
> from legacy <asm-generic/io.h> header file behavior. In particular,
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 157 *
> it would seem to make sense to do the iounmap(p) for the non-IO-space
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 158 *
> case here regardless, but that's not what the old header file code
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 159 *
> did. Probably incorrectly, but this is meant to be bug-for-bug
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 160 *
> compatible.
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 161
> */
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 162
> #if defined(ARCH_WANTS_GENERIC_PCI_IOUNMAP)
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 163
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 @164
> void pci_iounmap(struct pci_dev *dev, void __iomem *p)
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 165 {
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 166
> #ifdef ARCH_HAS_GENERIC_IOPORT_MAP
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19
> 167 uintptr_t start = (uintptr_t) PCI_IOBASE;
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19
> 168 uintptr_t addr = (uintptr_t) p;
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 169
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19
> 170 if (addr >= start && addr < start + IO_SPACE_LIMIT)
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19
> 171 return;
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19
> 172 iounmap(p);
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 173
> #endif
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 174 }
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 175
> EXPORT_SYMBOL(pci_iounmap);
> 316e8d79a0959c lib/pci_iomap.c Linus Torvalds 2021-09-19 176
>