x86/bugs: Flush IBP in ib_prctl_set()
We missed the window between the TIF flag update and the next reschedule. Signed-off-by: NRodrigo Branco <bsdaemon@google.com> Reviewed-by: NBorislav Petkov (AMD) <bp@alien8.de> Signed-off-by: NIngo Molnar <mingo@kernel.org> Cc: <stable@vger.kernel.org>
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