• Paul E. McKenney's avatar
    arm: Use _rcuidle tracepoint to allow use from idle · 0b9a29ad
    Paul E. McKenney authored
    Testing on ARM encountered the following pair of lockdep-RCU splats:
    
    ------------------------------------------------------------------------
    
    ===============================
    [ INFO: suspicious RCU usage. ]
    4.6.0-rc4-next-20160422 #1 Not tainted
    -------------------------------
    include/trace/events/power.h:328 suspicious rcu_dereference_check() usage!
    
    other info that might help us debug this:
    
    RCU used illegally from idle CPU!
    rcu_scheduler_active = 1, debug_locks = 0
    RCU used illegally from extended quiescent state!
    no locks held by swapper/0/0.
    
    stack backtrace:
    CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.6.0-rc4-next-20160422 #1
    Hardware name: Generic OMAP3-GP (Flattened Device Tree)
    [<c010f55c>] (unwind_backtrace) from [<c010b64c>] (show_stack+0x10/0x14)
    [<c010b64c>] (show_stack) from [<c047acbc>] (dump_stack+0xa8/0xe0)
    [<c047acbc>] (dump_stack) from [<c012bc10>] (pwrdm_set_next_pwrst+0xf8/0x1cc)
    [<c012bc10>] (pwrdm_set_next_pwrst) from [<c01269fc>] (omap3_enter_idle_bm+0x1b8/0x1e8)
    [<c01269fc>] (omap3_enter_idle_bm) from [<c05fa0b8>] (cpuidle_enter_state+0x84/0x408)
    [<c05fa0b8>] (cpuidle_enter_state) from [<c0182c1c>] (cpu_startup_entry+0x1c8/0x3f0)
    [<c0182c1c>] (cpu_startup_entry) from [<c0b00c20>] (start_kernel+0x354/0x3cc)
    
    ------------------------------------------------------------------------
    
    [<c010f55c>] (unwind_backtrace) from [<c010b64c>] (show_stack+0x10/0x14)
    [<c010b64c>] (show_stack) from [<c047ac3c>] (dump_stack+0xa8/0xe0)
    [<c047ac3c>] (dump_stack) from [<c012c340>] (_pwrdm_state_switch+0x188/0x32c)
    [<c012c340>] (_pwrdm_state_switch) from [<c012c4f0>] (_pwrdm_post_transition_cb+0xc/0x14)
    [<c012c4f0>] (_pwrdm_post_transition_cb) from [<c012ba74>] (pwrdm_for_each+0x30/0x5c)
    [<c012ba74>] (pwrdm_for_each) from [<c012c72c>] (pwrdm_post_transition+0x24/0x30)
    [<c012c72c>] (pwrdm_post_transition) from [<c012548c>] (omap_sram_idle+0xfc/0x240)
    [<c012548c>] (omap_sram_idle) from [<c0126934>] (omap3_enter_idle_bm+0xf0/0x1e8)
    [<c0126934>] (omap3_enter_idle_bm) from [<c05fa038>] (cpuidle_enter_state+0x84/0x408)
    [<c05fa038>] (cpuidle_enter_state) from [<c0182b90>] (cpu_startup_entry+0x1c8/0x3f0)
    [<c0182b90>] (cpu_startup_entry) from [<c0b00c20>] (start_kernel+0x354/0x3cc)
    
    ------------------------------------------------------------------------
    
    These are caused by event tracing from the idle loop, and they were
    exposed by commit 293e2421 ("rcu: Remove superfluous versions of
    rcu_read_lock_sched_held()"), which suppressed some false negatives.
    The current commit therefore adds the _rcuidle suffix to make RCU aware
    of this implicit use of RCU by event tracing, thus preventing both splats.
    Reported-by: default avatarGuenter Roeck <linux@roeck-us.net>
    Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
    Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
    Tested-by: default avatarTony Lindgren <tony@atomide.com>
    Cc: Russell King <linux@arm.linux.org.uk>
    Reviewed-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    Cc: <linux-omap@vger.kernel.org>
    Cc: <linux-arm-kernel@lists.infradead.org>
    0b9a29ad
powerdomain.c 31.9 KB