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| author | Sergey Ryazanov <ryazanov.s.a@gmail.com> | 2021-12-07 12:21:40 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-12-08 17:58:59 -0800 |
| commit | 283e6f5a8166f075eba78da6b867d76cc5d47e77 (patch) | |
| tree | ee7c7a9be96d421f0a3d5dd7bf55a63bed20c25a /drivers/net/wwan/Kconfig | |
| parent | cf90098dbb1f784661354ff8f7ca293e1ff8153b (diff) | |
| download | linux-283e6f5a8166f075eba78da6b867d76cc5d47e77.tar.bz2 | |
net: wwan: make debugfs optional
Debugfs interface is optional for the regular modem use. Some distros
and users will want to disable this feature for security or kernel
size reasons. So add a configuration option that allows to completely
disable the debugfs interface of the WWAN devices.
A primary considered use case for this option was embedded firmwares.
For example, in OpenWrt, you can not completely disable debugfs, as a
lot of wireless stuff can only be configured and monitored with the
debugfs knobs. At the same time, reducing the size of a kernel and
modules is an essential task in the world of embedded software.
Disabling the WWAN and IOSM debugfs interfaces allows us to save 50K
(x86-64 build) of space for module storage. Not much, but already
considerable when you only have 16MB of storage.
So it is hard to just disable whole debugfs. Users need some fine
grained set of options to control which debugfs interface is important
and should be available and which is not.
The new configuration symbol is enabled by default and is hidden under
the EXPERT option. So a regular user would not be bothered by another
one configuration question. While an embedded distro maintainer will be
able to a little more reduce the final image size.
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Acked-by: M Chetan Kumar <m.chetan.kumar@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/wwan/Kconfig')
| -rw-r--r-- | drivers/net/wwan/Kconfig | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/net/wwan/Kconfig b/drivers/net/wwan/Kconfig index 9f5111a77da9..609fd4a2c865 100644 --- a/drivers/net/wwan/Kconfig +++ b/drivers/net/wwan/Kconfig @@ -16,6 +16,17 @@ config WWAN if WWAN +config WWAN_DEBUGFS + bool "WWAN devices debugfs interface" if EXPERT + depends on DEBUG_FS + default y + help + Enables debugfs infrastructure for the WWAN core and device drivers. + + If this option is selected, then you can find the debug interface + elements for each WWAN device in a directory that is corresponding to + the device name: debugfs/wwan/wwanX. + config WWAN_HWSIM tristate "Simulated WWAN device" help @@ -85,7 +96,7 @@ config IOSM tristate "IOSM Driver for Intel M.2 WWAN Device" depends on INTEL_IOMMU select NET_DEVLINK - select RELAY + select RELAY if WWAN_DEBUGFS help This driver enables Intel M.2 WWAN Device communication. |