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ext2: mark as deprecated - kernel/git/torvalds/linux.git - Linux kernel source tree
(git.kernel.org)
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Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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That is a great analogy.
Linux can support ext2 two ways today: explicitly and as a side effect of ext4 support. All this change does is remove the explicit support.
We can remove the explicit CD support provided by a dedicated drive because the DVD drive will provide it as a side-effect.