Also, SuSE intended from the release of SLES 11 with 2.6.32 to be able to upgrade the major release of the kernel, and exerted pressure to keep things in mainline from breaking SLES 11 userspace. It's a lot easier to NACK patches and revert commits that haven't seen an official release yet than revert behavior changes where different programs may have come to rely on each behavior.
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