Re: [PATCH v4 1/2] drivers/s390/char: Add Ultravisor io device

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On 5/18/22 13:47, Heiko Carstens wrote:
On Tue, May 10, 2022 at 02:47:23PM +0000, Steffen Eiden wrote:
diff --git a/drivers/s390/char/Kconfig b/drivers/s390/char/Kconfig
index 6cc4b19acf85..e9b9902abbaf 100644
--- a/drivers/s390/char/Kconfig
+++ b/drivers/s390/char/Kconfig
@@ -100,6 +100,16 @@ config SCLP_OFB
  	  This option enables the Open-for-Business interface to the s390
  	  Service Element.
+config S390_UV_UAPI
+	def_tristate y
+	prompt "Ultravisor userspace API"
+	help
+	  Selecting exposes parts of the UV interface to userspace
+	  by providing a misc character device at /dev/uv.
+	  Using IOCTLs one can interact with the UV.
+	  The device is only available if the Ultravisor
+	  Facility (158) is present.

Is there a reason why this is default "y"? If you think this should be
compiled into the kernel if used, then why allow to make it a module
at all?
Instead you could get rid of a couple if lines of code.

There was a lot of discussion around this already and the "Y" was chosen as auto-loading this is a pain and therefore the SCLP and CHSC-Misc set it to Y and we took that as an example (Steffen spoke to Peter to get guidance).

I'm sure that we want the possibility to have this as a module. Personally I'd choose "m" over "y" since the module is only useful for a very small amount of users.



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