The title is arguably wrong, though: it should be titled 'Special sections in Linux kernel binaries', since it only relates to binaries *of* the Linux kernel, not (as I at first thought) to userspace binaries that run *on* Linux.
(Also, the alternatives mechanism isn't just for boot time anymore: it can run at any time. CPU hotplugging needs this when transitioning from a one-CPU system to a system with more CPUs, but it's useful elsewhere as well.)
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