diff mbox series

[RFC,25/32] watchdog: Kconfig: add HAS_IOPORT dependencies

Message ID 20211227164317.4146918-26-schnelle@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series Kconfig: Introduce HAS_IOPORT and LEGACY_PCI options | expand

Commit Message

Niklas Schnelle Dec. 27, 2021, 4:43 p.m. UTC 
In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
not being declared. We thus need to add HAS_IOPORT as dependency for
those drivers using them.

Co-developed-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
---
 drivers/watchdog/Kconfig | 2 ++
 1 file changed, 2 insertions(+)

Comments

Guenter Roeck Dec. 27, 2021, 6:03 p.m. UTC | #1 
On 12/27/21 8:43 AM, Niklas Schnelle wrote:
> In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> not being declared. We thus need to add HAS_IOPORT as dependency for
> those drivers using them.
> 

How is the need for HAS_IOPORT determined, when exactly is it needed,
and when not ?

$ git grep -E "inb|inw" drivers/watchdog/ | cut -f1 -d: | sort -u
drivers/watchdog/acquirewdt.c
drivers/watchdog/advantechwdt.c
drivers/watchdog/cpu5wdt.c
drivers/watchdog/f71808e_wdt.c
drivers/watchdog/ibmasr.c
drivers/watchdog/ie6xx_wdt.c
drivers/watchdog/it8712f_wdt.c
drivers/watchdog/it87_wdt.c
drivers/watchdog/iTCO_vendor_support.c
drivers/watchdog/iTCO_wdt.c
drivers/watchdog/Kconfig
drivers/watchdog/machzwd.c
drivers/watchdog/mixcomwd.c
drivers/watchdog/ni903x_wdt.c
drivers/watchdog/nic7018_wdt.c
drivers/watchdog/nv_tco.c
drivers/watchdog/pc87413_wdt.c
drivers/watchdog/pcwd.c
drivers/watchdog/pcwd_pci.c
drivers/watchdog/sbc60xxwdt.c
drivers/watchdog/sbc7240_wdt.c
drivers/watchdog/sc1200wdt.c
drivers/watchdog/sch311x_wdt.c
drivers/watchdog/smsc37b787_wdt.c
drivers/watchdog/sp5100_tco.c
drivers/watchdog/w83627hf_wdt.c
drivers/watchdog/w83877f_wdt.c
drivers/watchdog/w83977f_wdt.c
drivers/watchdog/wafer5823wdt.c
drivers/watchdog/wdt977.c
drivers/watchdog/wdt.c
drivers/watchdog/wdt_pci.c

Guenter

> Co-developed-by: Arnd Bergmann <arnd@kernel.org>
> Signed-off-by: Arnd Bergmann <arnd@kernel.org>
> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
> ---
>   drivers/watchdog/Kconfig | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 05258109bcc2..2e87a65bdc8b 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -452,6 +452,7 @@ config 21285_WATCHDOG
>   config 977_WATCHDOG
>   	tristate "NetWinder WB83C977 watchdog"
>   	depends on (FOOTBRIDGE && ARCH_NETWINDER) || (ARM && COMPILE_TEST)
> +	depends on HAS_IOPORT
>   	help
>   	  Say Y here to include support for the WB977 watchdog included in
>   	  NetWinder machines. Alternatively say M to compile the driver as
> @@ -1200,6 +1201,7 @@ config ITCO_WDT
>   	select WATCHDOG_CORE
>   	depends on I2C || I2C=n
>   	depends on MFD_INTEL_PMC_BXT || !MFD_INTEL_PMC_BXT
> +	depends on HAS_IOPORT # for I2C_I801
>   	select LPC_ICH if !EXPERT
>   	select I2C_I801 if !EXPERT && I2C
>   	help
>
Niklas Schnelle Dec. 28, 2021, 9:58 a.m. UTC | #2 
On Mon, 2021-12-27 at 10:03 -0800, Guenter Roeck wrote:
> On 12/27/21 8:43 AM, Niklas Schnelle wrote:
> > In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
> > not being declared. We thus need to add HAS_IOPORT as dependency for
> > those drivers using them.
> > 
> 
> How is the need for HAS_IOPORT determined, when exactly is it needed,
> and when not ?

I mostly used "make allyesconfig" on s390 with the accessors ifdeffed
out (i.e. patch 32) to find where the I/O port accesses were compiled
in. This means that it doesn't find drivers which pull in a HAS_IOPORT
dependency transitively e.g. by depending on x86 or ACPI. It should get
those that use e.g. "|| COMPILE_TEST" though. This might not be ideal
but on the other hand it should catch all those drivers that currently
built with known broken code.

> 
> $ git grep -E "inb|inw" drivers/watchdog/ | cut -f1 -d: | sort -u
> drivers/watchdog/acquirewdt.c
> drivers/watchdog/advantechwdt.c
> 
---8<---
diff mbox series

Patch

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 05258109bcc2..2e87a65bdc8b 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -452,6 +452,7 @@  config 21285_WATCHDOG
 config 977_WATCHDOG
 	tristate "NetWinder WB83C977 watchdog"
 	depends on (FOOTBRIDGE && ARCH_NETWINDER) || (ARM && COMPILE_TEST)
+	depends on HAS_IOPORT
 	help
 	  Say Y here to include support for the WB977 watchdog included in
 	  NetWinder machines. Alternatively say M to compile the driver as
@@ -1200,6 +1201,7 @@  config ITCO_WDT
 	select WATCHDOG_CORE
 	depends on I2C || I2C=n
 	depends on MFD_INTEL_PMC_BXT || !MFD_INTEL_PMC_BXT
+	depends on HAS_IOPORT # for I2C_I801
 	select LPC_ICH if !EXPERT
 	select I2C_I801 if !EXPERT && I2C
 	help