Rob Norris 410287f7f8
config/kernel: enforce maximum kernel version, with escape hatch ...
META lists the maximum kernel version we consider to be fully supported.
However, we don't enforce this.
Sometimes we ship experimental patches for a newer kernel than we're
ready to support or, less often, we compile just fine against a newer
kernel. Invariably, something doesn't quite work properly, and it's
difficult for users to understand that they're actually running against
a kernel that we're not yet ready to support.
This commit tries to improve this situation. First, it simply enforces
Linux-Maximum, by having configure bail out if you try to compile
against a newer version that.
Then, it adds the --enable-linux-experimental switch to configure. When
supplied, this disables enforcing the maximum version, allowing the user
to attempt to build against a kernel with version higher than
Linux-Maximum.
Finally, if the switch is supplied _and_ configure is run against a
higher kernel version, it shows a big warning message when configure
finishes, and defines HAVE_LINUX_EXPERIMENTAL for the build. This allows
us to add code to modify runtime behaviour as well.
Reviewed-by: Robert Evans <evansr@google.com >
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov >
Reviewed-by: Tony Hutter <hutter2@llnl.gov >
Signed-off-by: Rob Norris <robn@despairlabs.com >
Sponsored-by: https://despairlabs.com/sponsor/
Closes #15986
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Rob Norris
410287f7f8