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Add note about kernel version unportability

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Zbigniew Jędrzejewski-Szmek 2017-12-15 21:44:29 +01:00 committed by Lennart Poettering
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commit 871c6d54e4
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5
man/systemd.unit.xml
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@ -1055,6 +1055,11 @@
by <command>uname -r</command>) matches a certain expression (or if prefixed with the exclamation mark does not
match it). The argument must be a single string, optionally containing shell-style globs.</para>
<para>Note that using the kernel version string is an unreliable way to determine which features are supported
by a kernel, because of the widespread practice of backporting drivers, features, and fixes from newer upstream
kernels into older versions provided by distributions. Hence, this check is inherently unportable and should
not be used for units which may be used on different distributions.</para>
<para><varname>ConditionSecurity=</varname> may be used to
check whether the given security module is enabled on the
system. Currently, the recognized values are