Hello, Let me resend this. The only change in v2 is that I rediffed this series against v4.2-rc3.
5/6 patch fixes the bug, I think. Say, stop_one_cpu(X) can race with _cpu_down(X)->stop_machine() so that the kernel will crash if this CPU X becomes online again. The window after cpu_stopper_thread() returns and before smpboot_thread() calls ->park() is tiny, but still this is possible afaics. But see the changelog in 6/6, I think we should turn this cpu_stop_signal_done() into BUG() later. 6/6 removes lglock from kernel/stop_machine.c. Peter, Rik, what do you think ? Oleg. include/linux/lglock.h | 5 -- include/linux/stop_machine.h | 28 ++------ kernel/cpu.c | 2 +- kernel/locking/lglock.c | 22 ------ kernel/stop_machine.c | 162 ++++++++++++++++++++++++------------------ 5 files changed, 98 insertions(+), 121 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
