[RFC,15/15] mfd: syscon: Fix build of missing ioremap on UM
diff mbox

Message ID 1782092.xMPH0kgtGM@wuerfel
State RFC, archived
Headers show

Commit Message

Arnd Bergmann March 3, 2016, 10:50 a.m. UTC
On Thursday 03 March 2016 17:03:41 Krzysztof Kozlowski wrote:
> Since commit c89c0114955a ("mfd: syscon: Set regmap max_register in
> of_syscon_register") the syscon uses ioremap so it fails on COMPILE_TEST
> without HAS_IOMEM:
> 
> drivers/mfd/syscon.c: In function ‘of_syscon_register’:
> drivers/mfd/syscon.c:67:9: error: implicit declaration of function ‘ioremap’ [-Werror=implicit-function-declaration]
>   base = ioremap(res.start, resource_size(&res));
>          ^
> drivers/mfd/syscon.c:67:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
>   base = ioremap(res.start, resource_size(&res));
>        ^
> drivers/mfd/syscon.c:109:2: error: implicit declaration of function ‘iounmap’ [-Werror=implicit-function-declaration]
>   iounmap(base);
> 
> When selecting MFD_SYSCON, depend on HAS_IOMEM to avoid unmet direct
> dependencies.
> 
> Reported-by: kbuild test robot <lkp@intel.com>
> Fixes: c89c0114955a ("mfd: syscon: Set regmap max_register in of_syscon_register")
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> ---

Thanks for looking into this, the patches all look right to me, but
I fear we are forever playing catch-up here, as the number of syscon users
is only growing, and it's not obvious to the average driver developer
why they have to select this symbol.

Interestingly, when I try to build an allmodconfig kernel for UML,
it seems to reject any driver calling ioremap/iounmap but not
the wrapper functions around that (of_iomap, devm_ioremap,
devm_ioremap_resource, ...) or the actual accessors that make no
sense without ioremap (readl, writel, inb, outb, iowrite32, ...).

I've played with this a bit, and arrived at the patch below, is this
something we want as well?

	Arnd

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index aa21dc55eb15..2e5b1e525a1d 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1034,6 +1034,7 @@ config MFD_SUN6I_PRCM
>  
>  config MFD_SYSCON
>  	bool "System Controller Register R/W Based on Regmap"
> +	depends on HAS_IOMEM
>  	select REGMAP_MMIO
>  	help
>  	  Select this option to enable accessing system control registers
> 


 arch/um/include/asm/io.h           |    1 +
 drivers/char/Kconfig               |    3 +++
 drivers/char/mem.c                 |   16 ++++++++++++++++
 drivers/clocksource/Kconfig        |    3 +++
 drivers/fmc/Kconfig                |    1 +
 drivers/fpga/Kconfig               |    1 +
 drivers/hwtracing/intel_th/Kconfig |    1 +
 drivers/mfd/Kconfig                |    1 +
 drivers/misc/altera-stapl/Kconfig  |    2 +-
 drivers/mtd/chips/Kconfig          |    4 ++++
 drivers/mtd/lpddr/Kconfig          |    1 +
 drivers/mtd/maps/Kconfig           |    3 ++-
 drivers/mtd/nand/Kconfig           |    2 +-
 drivers/mtd/spi-nor/Kconfig        |    1 +
 drivers/net/can/Kconfig            |    1 +
 drivers/net/hamradio/Kconfig       |    9 ++++++---
 drivers/nvmem/Kconfig              |    1 +
 drivers/phy/Kconfig                |    9 +++++++--
 drivers/power/reset/Kconfig        |    4 +++-
 drivers/staging/comedi/Kconfig     |    6 +++++-
 drivers/thermal/Kconfig            |   11 +++++++++--
 include/linux/irq.h                |    2 ++
 include/linux/mtd/cfi.h            |    2 ++
 include/linux/mtd/map.h            |    2 ++
 kernel/resource.c                  |    2 ++
 lib/Kconfig                        |    7 ++++++-
 mm/bootmem.c                       |    4 ++--
 27 files changed, 85 insertions(+), 15 deletions(-)





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Comments

Krzysztof Kozlowski March 3, 2016, 12:24 p.m. UTC | #1
2016-03-03 19:50 GMT+09:00 Arnd Bergmann <arnd@arndb.de>:
> On Thursday 03 March 2016 17:03:41 Krzysztof Kozlowski wrote:
>> Since commit c89c0114955a ("mfd: syscon: Set regmap max_register in
>> of_syscon_register") the syscon uses ioremap so it fails on COMPILE_TEST
>> without HAS_IOMEM:
>>
>> drivers/mfd/syscon.c: In function ‘of_syscon_register’:
>> drivers/mfd/syscon.c:67:9: error: implicit declaration of function ‘ioremap’ [-Werror=implicit-function-declaration]
>>   base = ioremap(res.start, resource_size(&res));
>>          ^
>> drivers/mfd/syscon.c:67:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
>>   base = ioremap(res.start, resource_size(&res));
>>        ^
>> drivers/mfd/syscon.c:109:2: error: implicit declaration of function ‘iounmap’ [-Werror=implicit-function-declaration]
>>   iounmap(base);
>>
>> When selecting MFD_SYSCON, depend on HAS_IOMEM to avoid unmet direct
>> dependencies.
>>
>> Reported-by: kbuild test robot <lkp@intel.com>
>> Fixes: c89c0114955a ("mfd: syscon: Set regmap max_register in of_syscon_register")
>> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
>> ---
>
> Thanks for looking into this, the patches all look right to me, but
> I fear we are forever playing catch-up here, as the number of syscon users
> is only growing, and it's not obvious to the average driver developer
> why they have to select this symbol.

Actually I screwed something because entire MFD menuconfig (including
MFD_SYSCON) is already guarded by if HAS_IOMEM.

I was fixing the problem from the end (the build error) and then hit
these unmet direct dependencies (mentioned this in other mail).

I think this patch 15/15 is not needed.

>
> Interestingly, when I try to build an allmodconfig kernel for UML,
> it seems to reject any driver calling ioremap/iounmap but not
> the wrapper functions around that (of_iomap, devm_ioremap,
> devm_ioremap_resource, ...)

The declaration of devm-like functions is always there. However it
should fail during linking stage (see my other patches like for
thermal, nvram etc. this is still in progress because I did not manage
to build allyesconfig on UML yet).

> or the actual accessors that make no
> sense without ioremap (readl, writel, inb, outb, iowrite32, ...).
>
> I've played with this a bit, and arrived at the patch below, is this
> something we want as well?
>
>         Arnd
>
>> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
>> index aa21dc55eb15..2e5b1e525a1d 100644
>> --- a/drivers/mfd/Kconfig
>> +++ b/drivers/mfd/Kconfig
>> @@ -1034,6 +1034,7 @@ config MFD_SUN6I_PRCM
>>
>>  config MFD_SYSCON
>>       bool "System Controller Register R/W Based on Regmap"
>> +     depends on HAS_IOMEM
>>       select REGMAP_MMIO
>>       help
>>         Select this option to enable accessing system control registers
>>
>
>
>  arch/um/include/asm/io.h           |    1 +
>  drivers/char/Kconfig               |    3 +++
>  drivers/char/mem.c                 |   16 ++++++++++++++++
>  drivers/clocksource/Kconfig        |    3 +++
>  drivers/fmc/Kconfig                |    1 +
>  drivers/fpga/Kconfig               |    1 +
>  drivers/hwtracing/intel_th/Kconfig |    1 +
>  drivers/mfd/Kconfig                |    1 +
>  drivers/misc/altera-stapl/Kconfig  |    2 +-
>  drivers/mtd/chips/Kconfig          |    4 ++++
>  drivers/mtd/lpddr/Kconfig          |    1 +
>  drivers/mtd/maps/Kconfig           |    3 ++-
>  drivers/mtd/nand/Kconfig           |    2 +-
>  drivers/mtd/spi-nor/Kconfig        |    1 +
>  drivers/net/can/Kconfig            |    1 +
>  drivers/net/hamradio/Kconfig       |    9 ++++++---
>  drivers/nvmem/Kconfig              |    1 +
>  drivers/phy/Kconfig                |    9 +++++++--
>  drivers/power/reset/Kconfig        |    4 +++-
>  drivers/staging/comedi/Kconfig     |    6 +++++-
>  drivers/thermal/Kconfig            |   11 +++++++++--

For some of these I already started fixing:
https://lkml.org/lkml/2016/3/3/147
http://comments.gmane.org/gmane.linux.kernel/2167664


>  include/linux/irq.h                |    2 ++
>  include/linux/mtd/cfi.h            |    2 ++
>  include/linux/mtd/map.h            |    2 ++
>  kernel/resource.c                  |    2 ++
>  lib/Kconfig                        |    7 ++++++-
>  mm/bootmem.c                       |    4 ++--
>  27 files changed, 85 insertions(+), 15 deletions(-)
>
> diff --git a/arch/um/include/asm/io.h b/arch/um/include/asm/io.h
> new file mode 100644
> index 0000000..618ff13
> --- /dev/null
> +++ b/arch/um/include/asm/io.h
> @@ -0,0 +1 @@
> +/* no IOPORT or IOMEM suport */
> diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> index a043107..f6dc17a 100644
> --- a/drivers/char/Kconfig
> +++ b/drivers/char/Kconfig
> @@ -8,6 +8,7 @@ source "drivers/tty/Kconfig"
>
>  config DEVMEM
>         bool "/dev/mem virtual device support"
> +       depends on HAS_IOMEM
>         default y
>         help
>           Say Y here if you want to support the /dev/mem device.
> @@ -17,6 +18,7 @@ config DEVMEM
>
>  config DEVKMEM
>         bool "/dev/kmem virtual device support"
> +       depends on HAS_IOMEM
>         default y
>         help
>           Say Y here if you want to support the /dev/kmem device. The
> @@ -94,6 +96,7 @@ config BFIN_OTP_WRITE_ENABLE
>  config PRINTER
>         tristate "Parallel printer support"
>         depends on PARPORT
> +       depends on HAS_IOPORT
>         ---help---
>           If you intend to attach a printer to the parallel port of your Linux
>           box (as opposed to using a serial printer; if the connector at the
> diff --git a/drivers/char/mem.c b/drivers/char/mem.c
> index 4f6f94c..eedd129 100644
> --- a/drivers/char/mem.c
> +++ b/drivers/char/mem.c
> @@ -91,6 +91,7 @@ void __weak unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
>  }
>  #endif
>
> +#ifdef CONFIG_DEVMEM
>  /*
>   * This funcion reads the *physical* memory. The f_pos points directly to the
>   * memory location.
> @@ -219,6 +220,7 @@ static ssize_t write_mem(struct file *file, const char __user *buf,
>         *ppos += written;
>         return written;
>  }
> +#endif
>
>  int __weak phys_mem_access_prot_allowed(struct file *file,
>         unsigned long pfn, unsigned long size, pgprot_t *vma_prot)
> @@ -312,6 +314,7 @@ static inline int private_mapping_ok(struct vm_area_struct *vma)
>  }
>  #endif
>
> +#ifdef CONFIG_DEVMEM
>  static const struct vm_operations_struct mmap_mem_ops = {
>  #ifdef CONFIG_HAVE_IOREMAP_PROT
>         .access = generic_access_phys
> @@ -351,7 +354,9 @@ static int mmap_mem(struct file *file, struct vm_area_struct *vma)
>         }
>         return 0;
>  }
> +#endif
>
> +#ifdef CONFIG_DEVKMEM
>  static int mmap_kmem(struct file *file, struct vm_area_struct *vma)
>  {
>         unsigned long pfn;
> @@ -552,7 +557,9 @@ static ssize_t write_kmem(struct file *file, const char __user *buf,
>         *ppos = p;
>         return virtr + wrote ? : err;
>  }
> +#endif
>
> +#ifdef CONFIG_DEVPORT
>  static ssize_t read_port(struct file *file, char __user *buf,
>                          size_t count, loff_t *ppos)
>  {
> @@ -594,6 +601,7 @@ static ssize_t write_port(struct file *file, const char __user *buf,
>         *ppos = i;
>         return tmp-buf;
>  }
> +#endif
>
>  static ssize_t read_null(struct file *file, char __user *buf,
>                          size_t count, loff_t *ppos)
> @@ -710,10 +718,12 @@ static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
>         return ret;
>  }
>
> +#ifdef CONFIG_DEVPORT
>  static int open_port(struct inode *inode, struct file *filp)
>  {
>         return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
>  }
> +#endif
>
>  #define zero_lseek     null_lseek
>  #define full_lseek      null_lseek
> @@ -722,6 +732,7 @@ static int open_port(struct inode *inode, struct file *filp)
>  #define open_mem       open_port
>  #define open_kmem      open_mem
>
> +#ifdef CONFIG_DEVMEM
>  static const struct file_operations __maybe_unused mem_fops = {
>         .llseek         = memory_lseek,
>         .read           = read_mem,
> @@ -733,7 +744,9 @@ static const struct file_operations __maybe_unused mem_fops = {
>         .mmap_capabilities = memory_mmap_capabilities,
>  #endif
>  };
> +#endif
>
> +#ifdef CONFIG_DEVKMEM
>  static const struct file_operations __maybe_unused kmem_fops = {
>         .llseek         = memory_lseek,
>         .read           = read_kmem,
> @@ -745,6 +758,7 @@ static const struct file_operations __maybe_unused kmem_fops = {
>         .mmap_capabilities = memory_mmap_capabilities,
>  #endif
>  };
> +#endif
>
>  static const struct file_operations null_fops = {
>         .llseek         = null_lseek,
> @@ -755,12 +769,14 @@ static const struct file_operations null_fops = {
>         .splice_write   = splice_write_null,
>  };
>
> +#ifdef CONFIG_DEVPORT
>  static const struct file_operations __maybe_unused port_fops = {
>         .llseek         = memory_lseek,
>         .read           = read_port,
>         .write          = write_port,
>         .open           = open_port,
>  };
> +#endif
>
>  static const struct file_operations zero_fops = {
>         .llseek         = zero_lseek,
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index 33db740..6b58974 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -38,6 +38,7 @@ config DIGICOLOR_TIMER
>  config DW_APB_TIMER
>         bool "DW APB timer driver" if COMPILE_TEST
>         depends on GENERIC_CLOCKEVENTS
> +       depends on HAS_IOMEM
>         help
>           Enables the support for the dw_apb timer.
>
> @@ -64,6 +65,7 @@ config ARMADA_370_XP_TIMER
>  config MESON6_TIMER
>         bool "Meson6 timer driver" if COMPILE_TEST
>         depends on GENERIC_CLOCKEVENTS
> +       depends on HAS_IOMEM
>         select CLKSRC_MMIO
>         help
>           Enables the support for the Meson6 timer driver.
> @@ -114,6 +116,7 @@ config CADENCE_TTC_TIMER
>  config ASM9260_TIMER
>         bool "ASM9260 timer driver" if COMPILE_TEST
>         depends on GENERIC_CLOCKEVENTS
> +       depends on HAS_IOMEM
>         select CLKSRC_MMIO
>         select CLKSRC_OF
>         help
> diff --git a/drivers/fmc/Kconfig b/drivers/fmc/Kconfig
> index 3a75f42..adf1391 100644
> --- a/drivers/fmc/Kconfig
> +++ b/drivers/fmc/Kconfig
> @@ -4,6 +4,7 @@
>
>  menuconfig FMC
>         tristate "FMC support"
> +       depends on HAS_IOMEM
>         help
>
>           FMC (FPGA Mezzanine Carrier) is a mechanical and electrical
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index c9b9fdf..36c54af 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -21,6 +21,7 @@ config FPGA_MGR_SOCFPGA
>
>  config FPGA_MGR_ZYNQ_FPGA
>         tristate "Xilinx Zynq FPGA"
> +       depends on HAS_IOMEM
>         help
>           FPGA manager driver support for Xilinx Zynq FPGAs.
>
> diff --git a/drivers/hwtracing/intel_th/Kconfig b/drivers/hwtracing/intel_th/Kconfig
> index b7a9073..467dae9 100644
> --- a/drivers/hwtracing/intel_th/Kconfig
> +++ b/drivers/hwtracing/intel_th/Kconfig
> @@ -1,5 +1,6 @@
>  config INTEL_TH
>         tristate "Intel(R) Trace Hub controller"
> +       depends on HAS_IOMEM
>         help
>           Intel(R) Trace Hub (TH) is a set of hardware blocks (subdevices) that
>           produce, switch and output trace data from multiple hardware and
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 9ca66de..6ff6246 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -999,6 +999,7 @@ config MFD_SUN6I_PRCM
>
>  config MFD_SYSCON
>         bool "System Controller Register R/W Based on Regmap"
> +       depends on HAS_IOMEM

This shouldn't be needed. There is if HAS_IOMEM at beginning.

Best regards,
Krzysztof
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Patch
diff mbox

diff --git a/arch/um/include/asm/io.h b/arch/um/include/asm/io.h
new file mode 100644
index 0000000..618ff13
--- /dev/null
+++ b/arch/um/include/asm/io.h
@@ -0,0 +1 @@ 
+/* no IOPORT or IOMEM suport */
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index a043107..f6dc17a 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -8,6 +8,7 @@  source "drivers/tty/Kconfig"
 
 config DEVMEM
 	bool "/dev/mem virtual device support"
+	depends on HAS_IOMEM
 	default y
 	help
 	  Say Y here if you want to support the /dev/mem device.
@@ -17,6 +18,7 @@  config DEVMEM
 
 config DEVKMEM
 	bool "/dev/kmem virtual device support"
+	depends on HAS_IOMEM
 	default y
 	help
 	  Say Y here if you want to support the /dev/kmem device. The
@@ -94,6 +96,7 @@  config BFIN_OTP_WRITE_ENABLE
 config PRINTER
 	tristate "Parallel printer support"
 	depends on PARPORT
+	depends on HAS_IOPORT
 	---help---
 	  If you intend to attach a printer to the parallel port of your Linux
 	  box (as opposed to using a serial printer; if the connector at the
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 4f6f94c..eedd129 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -91,6 +91,7 @@  void __weak unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
 }
 #endif
 
+#ifdef CONFIG_DEVMEM
 /*
  * This funcion reads the *physical* memory. The f_pos points directly to the
  * memory location.
@@ -219,6 +220,7 @@  static ssize_t write_mem(struct file *file, const char __user *buf,
 	*ppos += written;
 	return written;
 }
+#endif
 
 int __weak phys_mem_access_prot_allowed(struct file *file,
 	unsigned long pfn, unsigned long size, pgprot_t *vma_prot)
@@ -312,6 +314,7 @@  static inline int private_mapping_ok(struct vm_area_struct *vma)
 }
 #endif
 
+#ifdef CONFIG_DEVMEM
 static const struct vm_operations_struct mmap_mem_ops = {
 #ifdef CONFIG_HAVE_IOREMAP_PROT
 	.access = generic_access_phys
@@ -351,7 +354,9 @@  static int mmap_mem(struct file *file, struct vm_area_struct *vma)
 	}
 	return 0;
 }
+#endif
 
+#ifdef CONFIG_DEVKMEM
 static int mmap_kmem(struct file *file, struct vm_area_struct *vma)
 {
 	unsigned long pfn;
@@ -552,7 +557,9 @@  static ssize_t write_kmem(struct file *file, const char __user *buf,
 	*ppos = p;
 	return virtr + wrote ? : err;
 }
+#endif
 
+#ifdef CONFIG_DEVPORT
 static ssize_t read_port(struct file *file, char __user *buf,
 			 size_t count, loff_t *ppos)
 {
@@ -594,6 +601,7 @@  static ssize_t write_port(struct file *file, const char __user *buf,
 	*ppos = i;
 	return tmp-buf;
 }
+#endif
 
 static ssize_t read_null(struct file *file, char __user *buf,
 			 size_t count, loff_t *ppos)
@@ -710,10 +718,12 @@  static loff_t memory_lseek(struct file *file, loff_t offset, int orig)
 	return ret;
 }
 
+#ifdef CONFIG_DEVPORT
 static int open_port(struct inode *inode, struct file *filp)
 {
 	return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
 }
+#endif
 
 #define zero_lseek	null_lseek
 #define full_lseek      null_lseek
@@ -722,6 +732,7 @@  static int open_port(struct inode *inode, struct file *filp)
 #define open_mem	open_port
 #define open_kmem	open_mem
 
+#ifdef CONFIG_DEVMEM
 static const struct file_operations __maybe_unused mem_fops = {
 	.llseek		= memory_lseek,
 	.read		= read_mem,
@@ -733,7 +744,9 @@  static const struct file_operations __maybe_unused mem_fops = {
 	.mmap_capabilities = memory_mmap_capabilities,
 #endif
 };
+#endif
 
+#ifdef CONFIG_DEVKMEM
 static const struct file_operations __maybe_unused kmem_fops = {
 	.llseek		= memory_lseek,
 	.read		= read_kmem,
@@ -745,6 +758,7 @@  static const struct file_operations __maybe_unused kmem_fops = {
 	.mmap_capabilities = memory_mmap_capabilities,
 #endif
 };
+#endif
 
 static const struct file_operations null_fops = {
 	.llseek		= null_lseek,
@@ -755,12 +769,14 @@  static const struct file_operations null_fops = {
 	.splice_write	= splice_write_null,
 };
 
+#ifdef CONFIG_DEVPORT
 static const struct file_operations __maybe_unused port_fops = {
 	.llseek		= memory_lseek,
 	.read		= read_port,
 	.write		= write_port,
 	.open		= open_port,
 };
+#endif
 
 static const struct file_operations zero_fops = {
 	.llseek		= zero_lseek,
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 33db740..6b58974 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -38,6 +38,7 @@  config DIGICOLOR_TIMER
 config DW_APB_TIMER
 	bool "DW APB timer driver" if COMPILE_TEST
 	depends on GENERIC_CLOCKEVENTS
+	depends on HAS_IOMEM
 	help
 	  Enables the support for the dw_apb timer.
 
@@ -64,6 +65,7 @@  config ARMADA_370_XP_TIMER
 config MESON6_TIMER
 	bool "Meson6 timer driver" if COMPILE_TEST
 	depends on GENERIC_CLOCKEVENTS
+	depends on HAS_IOMEM
 	select CLKSRC_MMIO
 	help
 	  Enables the support for the Meson6 timer driver.
@@ -114,6 +116,7 @@  config CADENCE_TTC_TIMER
 config ASM9260_TIMER
 	bool "ASM9260 timer driver" if COMPILE_TEST
 	depends on GENERIC_CLOCKEVENTS
+	depends on HAS_IOMEM
 	select CLKSRC_MMIO
 	select CLKSRC_OF
 	help
diff --git a/drivers/fmc/Kconfig b/drivers/fmc/Kconfig
index 3a75f42..adf1391 100644
--- a/drivers/fmc/Kconfig
+++ b/drivers/fmc/Kconfig
@@ -4,6 +4,7 @@ 
 
 menuconfig FMC
 	tristate "FMC support"
+	depends on HAS_IOMEM
 	help
 
 	  FMC (FPGA Mezzanine Carrier) is a mechanical and electrical
diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
index c9b9fdf..36c54af 100644
--- a/drivers/fpga/Kconfig
+++ b/drivers/fpga/Kconfig
@@ -21,6 +21,7 @@  config FPGA_MGR_SOCFPGA
 
 config FPGA_MGR_ZYNQ_FPGA
 	tristate "Xilinx Zynq FPGA"
+	depends on HAS_IOMEM
 	help
 	  FPGA manager driver support for Xilinx Zynq FPGAs.
 
diff --git a/drivers/hwtracing/intel_th/Kconfig b/drivers/hwtracing/intel_th/Kconfig
index b7a9073..467dae9 100644
--- a/drivers/hwtracing/intel_th/Kconfig
+++ b/drivers/hwtracing/intel_th/Kconfig
@@ -1,5 +1,6 @@ 
 config INTEL_TH
 	tristate "Intel(R) Trace Hub controller"
+	depends on HAS_IOMEM
 	help
 	  Intel(R) Trace Hub (TH) is a set of hardware blocks (subdevices) that
 	  produce, switch and output trace data from multiple hardware and
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9ca66de..6ff6246 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -999,6 +999,7 @@  config MFD_SUN6I_PRCM
 
 config MFD_SYSCON
 	bool "System Controller Register R/W Based on Regmap"
+	depends on HAS_IOMEM
 	select REGMAP_MMIO
 	help
 	  Select this option to enable accessing system control registers
diff --git a/drivers/misc/altera-stapl/Kconfig b/drivers/misc/altera-stapl/Kconfig
index 7f01d8e..c7e4c77 100644
--- a/drivers/misc/altera-stapl/Kconfig
+++ b/drivers/misc/altera-stapl/Kconfig
@@ -2,7 +2,7 @@  comment "Altera FPGA firmware download module"
 
 config ALTERA_STAPL
 	tristate "Altera FPGA firmware download module"
-	depends on I2C
+	depends on I2C && HAS_IOPORT
 	default n
 	help
 	  An Altera FPGA module. Say Y when you want to support this tool.
diff --git a/drivers/mtd/chips/Kconfig b/drivers/mtd/chips/Kconfig
index 3b3dabc..189ddce 100644
--- a/drivers/mtd/chips/Kconfig
+++ b/drivers/mtd/chips/Kconfig
@@ -3,6 +3,7 @@  menu "RAM/ROM/Flash chip drivers"
 
 config MTD_CFI
 	tristate "Detect flash chips by Common Flash Interface (CFI) probe"
+	depends on HAS_IOMEM
 	select MTD_GEN_PROBE
 	select MTD_CFI_UTIL
 	help
@@ -15,6 +16,7 @@  config MTD_CFI
 
 config MTD_JEDECPROBE
 	tristate "Detect non-CFI AMD/JEDEC-compatible flash chips"
+	depends on HAS_IOMEM
 	select MTD_GEN_PROBE
 	select MTD_CFI_UTIL
 	help
@@ -207,12 +209,14 @@  config MTD_CFI_UTIL
 
 config MTD_RAM
 	tristate "Support for RAM chips in bus mapping"
+	depends on HAS_IOMEM
 	help
 	  This option enables basic support for RAM chips accessed through
 	  a bus mapping driver.
 
 config MTD_ROM
 	tristate "Support for ROM chips in bus mapping"
+	depends on HAS_IOMEM
 	help
 	  This option enables basic support for ROM chips accessed through
 	  a bus mapping driver.
diff --git a/drivers/mtd/lpddr/Kconfig b/drivers/mtd/lpddr/Kconfig
index 3a19cbe..07dd95a 100644
--- a/drivers/mtd/lpddr/Kconfig
+++ b/drivers/mtd/lpddr/Kconfig
@@ -4,6 +4,7 @@  menu "LPDDR & LPDDR2 PCM memory drivers"
 config MTD_LPDDR
 	tristate "Support for LPDDR flash chips"
 	select MTD_QINFO_PROBE
+	depends on HAS_IOMEM
 	help
 	  This option enables support of LPDDR (Low power double data rate)
 	  flash chips. Synonymous with Mobile-DDR. It is a new standard for
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 7c95a65..86a9604 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -3,7 +3,8 @@  menu "Mapping drivers for chip access"
 	depends on HAS_IOMEM
 
 config MTD_COMPLEX_MAPPINGS
-	bool "Support non-linear mappings of flash chips"
+	bool "Support non-linear mappings of flash chips" if HAS_IOMEM
+	default !HAS_IOMEM
 	help
 	  This causes the chip drivers to allow for complicated
 	  paged mappings of flash chips.
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 20f01b3..6ed3de7 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -12,7 +12,7 @@  config MTD_NAND_ECC_SMC
 
 menuconfig MTD_NAND
 	tristate "NAND Device Support"
-	depends on MTD
+	depends on MTD && HAS_IOMEM
 	select MTD_NAND_IDS
 	select MTD_NAND_ECC
 	help
diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 0dc9275..83befab 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -9,6 +9,7 @@  if MTD_SPI_NOR
 
 config MTD_MT81xx_NOR
 	tristate "Mediatek MT81xx SPI NOR flash controller"
+	depends on HAS_IOMEM
 	help
 	  This enables access to SPI NOR flash, using MT81xx SPI NOR flash
 	  controller. This controller does not support generic SPI BUS, it only
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index 6d04183..b1e268b 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -132,6 +132,7 @@  config CAN_RCAR
 config CAN_SUN4I
 	tristate "Allwinner A10 CAN controller"
 	depends on MACH_SUN4I || MACH_SUN7I || COMPILE_TEST
+	depends on HAS_IOMEM
 	---help---
 	  Say Y here if you want to use CAN controller found on Allwinner
 	  A10/A20 SoCs.
diff --git a/drivers/net/hamradio/Kconfig b/drivers/net/hamradio/Kconfig
index bf5e596..507f7a5 100644
--- a/drivers/net/hamradio/Kconfig
+++ b/drivers/net/hamradio/Kconfig
@@ -113,7 +113,8 @@  config SCC_TRXECHO
 
 config BAYCOM_SER_FDX
 	tristate "BAYCOM ser12 fullduplex driver for AX.25"
-	depends on AX25 && !S390
+	depends on AX25
+	depends on HAS_IOPORT
 	select CRC_CCITT
 	---help---
 	  This is one of two drivers for Baycom style simple amateur radio
@@ -133,7 +134,8 @@  config BAYCOM_SER_FDX
 
 config BAYCOM_SER_HDX
 	tristate "BAYCOM ser12 halfduplex driver for AX.25"
-	depends on AX25 && !S390
+	depends on AX25
+	depends on HAS_IOPORT
 	select CRC_CCITT
 	---help---
 	  This is one of two drivers for Baycom style simple amateur radio
@@ -181,7 +183,8 @@  config BAYCOM_EPP
 
 config YAM
 	tristate "YAM driver for AX.25"
-	depends on AX25 && !S390
+	depends on AX25
+	depends on HAS_IOPORT
 	help
 	  The YAM is a modem for packet radio which connects to the serial
 	  port and includes some of the functions of a Terminal Node
diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index bc4ea58..6ef3d0a 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -1,6 +1,7 @@ 
 menuconfig NVMEM
 	tristate "NVMEM Support"
 	select REGMAP
+	depends on HAS_IOMEM
 	help
 	  Support for NVMEM(Non Volatile Memory) devices like EEPROM, EFUSES...
 
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index e7e117d..d2216df 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -30,9 +30,10 @@  config PHY_BERLIN_SATA
 	  Enable this to support the SATA PHY on Marvell Berlin SoCs.
 
 config ARMADA375_USBCLUSTER_PHY
-	def_bool y
-	depends on MACH_ARMADA_375 || COMPILE_TEST
+	bool "ARMADA 375 USB cluster PHY driver" if COMPILE_TEST && !MACH_ARMADA_375
+	def_bool MACH_ARMADA_375
 	depends on OF
+	depends on HAS_IOMEM
 	select GENERIC_PHY
 
 config PHY_DM816X_USB
@@ -128,6 +129,7 @@  config PHY_RCAR_GEN3_USB2
 config OMAP_CONTROL_PHY
 	tristate "OMAP CONTROL PHY Driver"
 	depends on ARCH_OMAP2PLUS || COMPILE_TEST
+	depends on HAS_IOMEM
 	help
 	  Enable this to add support for the PHY part present in the control
 	  module. This driver has API to power on the USB2 PHY and to write to
@@ -224,6 +226,8 @@  config PHY_MT65XX_USB3
 
 config PHY_HI6220_USB
 	tristate "hi6220 USB PHY support"
+	depends on ARM64 || COMPILE_TEST
+	depends on HAS_IOMEM
 	select GENERIC_PHY
 	select MFD_SYSCON
 	help
@@ -401,6 +405,7 @@  config PHY_CYGNUS_PCIE
 	tristate "Broadcom Cygnus PCIe PHY driver"
 	depends on OF && (ARCH_BCM_CYGNUS || COMPILE_TEST)
 	select GENERIC_PHY
+	depends on HAS_IOMEM
 	default ARCH_BCM_CYGNUS
 	help
 	  Enable this to support the Broadcom Cygnus PCIe PHY.
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index 1131cf7..bb5bd1b 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -41,7 +41,7 @@  config POWER_RESET_AXXIA
 config POWER_RESET_BRCMSTB
 	bool "Broadcom STB reset driver"
 	depends on ARM || MIPS || COMPILE_TEST
-	depends on MFD_SYSCON
+	depends on MFD_SYSCON && HAS_IOMEM
 	default ARCH_BRCMSTB
 	help
 	  This driver provides restart support for Broadcom STB boards.
@@ -148,6 +148,7 @@  config POWER_RESET_KEYSTONE
 config POWER_RESET_SYSCON
 	bool "Generic SYSCON regmap reset driver"
 	depends on OF
+	depends on HAS_IOMEM
 	select MFD_SYSCON
 	help
 	  Reboot support for generic SYSCON mapped register reset.
@@ -155,6 +156,7 @@  config POWER_RESET_SYSCON
 config POWER_RESET_SYSCON_POWEROFF
 	bool "Generic SYSCON regmap poweroff driver"
 	depends on OF
+	depends on HAS_IOMEM
 	select MFD_SYSCON
 	help
 	  Poweroff support for generic SYSCON mapped register poweroff.
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index e7255f8..e1ba4aa 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -67,6 +67,7 @@  config COMEDI_TEST
 
 config COMEDI_PARPORT
 	tristate "Parallel port support"
+	depends on HAS_IOPORT
 	---help---
 	  Enable support for the standard parallel port.
 	  A cheap and easy way to get a few more digital I/O lines. Steal
@@ -87,6 +88,7 @@  config COMEDI_SERIAL2002
 config COMEDI_SSV_DNP
 	tristate "SSV Embedded Systems DIL/Net-PC support"
 	depends on X86_32 || COMPILE_TEST
+	depends on HAS_IOPORT
 	---help---
 	  Enable support for SSV Embedded Systems DIL/Net-PC
 
@@ -97,6 +99,7 @@  endif # COMEDI_MISC_DRIVERS
 
 menuconfig COMEDI_ISA_DRIVERS
 	bool "Comedi ISA and PC/104 drivers"
+	depends on HAS_IOPORT
 	---help---
 	  Enable comedi ISA and PC/104 drivers to be built
 
@@ -1110,7 +1113,7 @@  endif # COMEDI_PCI_DRIVERS
 
 menuconfig COMEDI_PCMCIA_DRIVERS
 	tristate "Comedi PCMCIA drivers"
-	depends on PCMCIA
+	depends on PCMCIA && HAS_IOPORT
 	---help---
 	  Enable support for comedi PCMCIA drivers.
 
@@ -1262,6 +1265,7 @@  config COMEDI_8255
 config COMEDI_8255_SA
 	tristate "Standalone 8255 support"
 	select COMEDI_8255
+	depends on HAS_IOPORT
 	---help---
 	  Enable support for 8255 digital I/O as a standalone driver.
 
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 8cc4ac6..31ae027 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -178,6 +178,7 @@  config THERMAL_EMULATION
 config HISI_THERMAL
 	tristate "Hisilicon thermal driver"
 	depends on (ARCH_HISI && CPU_THERMAL && OF) || COMPILE_TEST
+	depends on HAS_IOMEM
 	help
 	  Enable this to plug hisilicon's thermal sensor driver into the Linux
 	  thermal framework. cpufreq is used as the cooling device to throttle
@@ -198,6 +199,7 @@  config SPEAR_THERMAL
 	bool "SPEAr thermal sensor driver"
 	depends on PLAT_SPEAR || COMPILE_TEST
 	depends on OF
+	depends on HAS_IOMEM
 	help
 	  Enable this to plug the SPEAr thermal sensor driver into the Linux
 	  thermal framework.
@@ -206,6 +208,7 @@  config ROCKCHIP_THERMAL
 	tristate "Rockchip thermal driver"
 	depends on ARCH_ROCKCHIP || COMPILE_TEST
 	depends on RESET_CONTROLLER
+	depends on HAS_IOMEM
 	help
 	  Rockchip thermal driver provides support for Temperature sensor
 	  ADC (TS-ADC) found on Rockchip SoCs. It supports one critical
@@ -216,6 +219,7 @@  config RCAR_THERMAL
 	tristate "Renesas R-Car thermal driver"
 	depends on ARCH_SHMOBILE || COMPILE_TEST
 	depends on HAS_IOMEM
+	depends on HAS_IOMEM
 	help
 	  Enable this to plug the R-Car thermal sensor driver into the Linux
 	  thermal framework.
@@ -223,6 +227,7 @@  config RCAR_THERMAL
 config KIRKWOOD_THERMAL
 	tristate "Temperature sensor on Marvell Kirkwood SoCs"
 	depends on MACH_KIRKWOOD || COMPILE_TEST
+	depends on HAS_IOMEM
 	depends on OF
 	help
 	  Support for the Kirkwood thermal sensor driver into the Linux thermal
@@ -231,6 +236,7 @@  config KIRKWOOD_THERMAL
 config DOVE_THERMAL
 	tristate "Temperature sensor on Marvell Dove SoCs"
 	depends on ARCH_DOVE || MACH_DOVE || COMPILE_TEST
+	depends on HAS_IOMEM
 	depends on OF
 	help
 	  Support for the Dove thermal sensor driver in the Linux thermal
@@ -249,6 +255,7 @@  config DB8500_THERMAL
 config ARMADA_THERMAL
 	tristate "Armada 370/XP thermal management"
 	depends on ARCH_MVEBU || COMPILE_TEST
+	depends on HAS_IOMEM
 	depends on OF
 	help
 	  Enable this option if you want to have support for thermal management
@@ -366,12 +373,12 @@  config INTEL_PCH_THERMAL
 	  programmable trip points and other information.
 
 menu "Texas Instruments thermal drivers"
-depends on ARCH_HAS_BANDGAP || COMPILE_TEST
+depends on ARCH_HAS_BANDGAP || (COMPILE_TEST && HAS_IOMEM)
 source "drivers/thermal/ti-soc-thermal/Kconfig"
 endmenu
 
 menu "Samsung thermal drivers"
-depends on ARCH_EXYNOS || COMPILE_TEST
+depends on ARCH_EXYNOS || (COMPILE_TEST && HAS_IOMEM)
 source "drivers/thermal/samsung/Kconfig"
 endmenu
 
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 3c1c967..a5d0f12 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -916,6 +916,7 @@  static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
 static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
 #endif
 
+#ifdef CONFIG_HAS_IOMEM
 static inline void irq_reg_writel(struct irq_chip_generic *gc,
 				  u32 val, int reg_offset)
 {
@@ -933,5 +934,6 @@  static inline u32 irq_reg_readl(struct irq_chip_generic *gc,
 	else
 		return readl(gc->reg_base + reg_offset);
 }
+#endif
 
 #endif /* _LINUX_IRQ_H */
diff --git a/include/linux/mtd/cfi.h b/include/linux/mtd/cfi.h
index 9b57a9b..d5db153 100644
--- a/include/linux/mtd/cfi.h
+++ b/include/linux/mtd/cfi.h
@@ -310,6 +310,7 @@  uint32_t cfi_send_gen_cmd(u_char cmd, uint32_t cmd_addr, uint32_t base,
 				struct map_info *map, struct cfi_private *cfi,
 				int type, map_word *prev_val);
 
+#ifdef CONFIG_HAS_IOMEM
 static inline uint8_t cfi_read_query(struct map_info *map, uint32_t addr)
 {
 	map_word val = map_read(map, addr);
@@ -341,6 +342,7 @@  static inline uint16_t cfi_read_query16(struct map_info *map, uint32_t addr)
 		return cfi32_to_cpu(map, val.x[0]);
 	}
 }
+#endif
 
 void cfi_udelay(int us);
 
diff --git a/include/linux/mtd/map.h b/include/linux/mtd/map.h
index 58f3ba7..07c0d497 100644
--- a/include/linux/mtd/map.h
+++ b/include/linux/mtd/map.h
@@ -410,6 +410,7 @@  static inline map_word map_word_ff(struct map_info *map)
 	return r;
 }
 
+#ifdef CONFIG_HAS_IOMEM
 static inline map_word inline_map_read(struct map_info *map, unsigned long ofs)
 {
 	map_word r;
@@ -463,6 +464,7 @@  static inline void inline_map_copy_to(struct map_info *map, unsigned long to, co
 {
 	memcpy_toio(map->virt + to, from, len);
 }
+#endif
 
 #ifdef CONFIG_MTD_COMPLEX_MAPPINGS
 #define map_read(map, ofs) (map)->read(map, ofs)
diff --git a/kernel/resource.c b/kernel/resource.c
index 09c0597..efd5c9e 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -29,7 +29,9 @@ 
 struct resource ioport_resource = {
 	.name	= "PCI IO",
 	.start	= 0,
+#ifdef CONFIG_HAS_IOPORT
 	.end	= IO_SPACE_LIMIT,
+#endif
 	.flags	= IORESOURCE_IO,
 };
 EXPORT_SYMBOL(ioport_resource);
diff --git a/lib/Kconfig b/lib/Kconfig
index 133ebc0..38ff36d 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -382,9 +382,14 @@  config HAS_IOMEM
 	select GENERIC_IO
 	default y
 
+config HAS_IOPORT
+	bool
+	depends on HAS_IOMEM && !NO_IOPORT
+	default y
+
 config HAS_IOPORT_MAP
 	bool
-	depends on HAS_IOMEM && !NO_IOPORT_MAP
+	depends on HAS_IOMEM && HAS_IOPORT && !NO_IOPORT_MAP
 	default y
 
 config HAS_DMA
diff --git a/mm/bootmem.c b/mm/bootmem.c
index 91e32bc..3471237 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -99,7 +99,7 @@  static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
 	unsigned long mapsize;
 
 	mminit_validate_memmodel_limits(&start, &end);
-	bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
+	bdata->node_bootmem_map = __va(PFN_PHYS(mapstart));
 	bdata->node_min_pfn = start;
 	bdata->node_low_pfn = end;
 	link_bootmem(bdata);
@@ -585,7 +585,7 @@  find_block:
 				PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 			BUG();
 
-		region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
+		region = __va(PFN_PHYS(bdata->node_min_pfn) +
 				start_off);
 		memset(region, 0, size);
 		/*