• Linus Torvalds's avatar
    Revert "nohz: Fix collision between tick and other hrtimers" · 558e8e27
    Linus Torvalds authored
    This reverts commit 24b91e36 and commit
    7bdb59f1 ("tick/nohz: Fix possible missing clock reprog after tick
    soft restart") that depends on it,
    
    Pavel reports that it causes occasional boot hangs for him that seem to
    depend on just how the machine was booted.  In particular, his machine
    hangs at around the PCI fixups of the EHCI USB host controller, but only
    hangs from cold boot, not from a warm boot.
    
    Thomas Gleixner suspecs it's a CPU hotplug interaction, particularly
    since Pavel also saw suspend/resume issues that seem to be related.
    We're reverting for now while trying to figure out the root cause.
    Reported-bisected-and-tested-by: default avatarPavel Machek <pavel@ucw.cz>
    Acked-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    Cc: Wanpeng Li <wanpeng.li@hotmail.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: stable@kernel.org  # reverted commits were marked for stable
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    558e8e27
tick-sched.c 30.9 KB