Johnny Liu c580fd0d06 devfreq: use conftest for conditional module build ...

Some distros might use old kernel source but with some latest upstream
kernel patches backported to their kernel source tree. To deal with this
scenario and avoid kernel compilation failure, use conftest to check the
existence of features against the kernel source tree which the OOT
modules are built upon and do the conditional build based on the test
result generated with the conftest tool.

Use NV_DEVFREQ_HAS_FREQ_TABLE to determine whether freq_table field is
there in struct devfreq data strcuture, and choose the correct path for
building the module.

Use tegra_wmark-specific devfreq_get_freq_range always to avoid kernel
version check and conftest check. Since devfreq_get_freq_range exists in
the devfreq-specific governor.h (e.g. drivers/devfreq/governor.h) file
instead of globabl linux kernel include header files
(e.g. include/linux/devfreq.h), conftest cannot be used to the existence
of devfreq_get_freq_range kernel function.

Bug 4884092

Change-Id: I5bde4c712f59f38de74c1d8d95135c9b25d621b1
Signed-off-by: Johnny Liu <johnliu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3220896
Tested-by: Paritosh Dixit <paritoshd@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Jon Hunter <jonathanh@nvidia.com>

2024-10-01 02:08:56 -07:00

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