On Sun, Oct 21, 2018 at 09:36:14PM +0300, Dmitry Osipenko wrote: > This fixes splats like the one below if CONFIG_DEBUG_ATOMIC_SLEEP=y > and machine (Tegra30) booted with SMP=n or all secondary CPU's are put > offline. Locking isn't needed because it protects atomic operation. > > # echo 0 | tee /sys/devices/system/cpu/cpu[1-3]/online > > BUG: sleeping function called from invalid context at kernel/locking/mutex.c:254 > in_atomic(): 1, irqs_disabled(): 128, pid: 0, name: swapper/0 > CPU: 0 PID: 0 Comm: swapper/0 Tainted: G C 4.18.0-next-20180821-00180-gc3ebb6544e44-dirty #823 > Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) > [<c01134f4>] (unwind_backtrace) from [<c010db2c>] (show_stack+0x20/0x24) > [<c010db2c>] (show_stack) from [<c0bd0f3c>] (dump_stack+0x94/0xa8) > [<c0bd0f3c>] (dump_stack) from [<c0151df8>] (___might_sleep+0x13c/0x174) > [<c0151df8>] (___might_sleep) from [<c0151ea0>] (__might_sleep+0x70/0xa8) > [<c0151ea0>] (__might_sleep) from [<c0bec2b8>] (mutex_lock+0x2c/0x70) > [<c0bec2b8>] (mutex_lock) from [<c0589844>] (tegra_powergate_is_powered+0x44/0xa8) > [<c0589844>] (tegra_powergate_is_powered) from [<c0581a60>] (tegra30_cpu_rail_off_ready+0x30/0x74) > [<c0581a60>] (tegra30_cpu_rail_off_ready) from [<c0122244>] (tegra30_idle_lp2+0xa0/0x108) > [<c0122244>] (tegra30_idle_lp2) from [<c0853438>] (cpuidle_enter_state+0x140/0x540) > [<c0853438>] (cpuidle_enter_state) from [<c08538a4>] (cpuidle_enter+0x40/0x4c) > [<c08538a4>] (cpuidle_enter) from [<c01595e0>] (call_cpuidle+0x30/0x48) > [<c01595e0>] (call_cpuidle) from [<c01599f8>] (do_idle+0x238/0x28c) > [<c01599f8>] (do_idle) from [<c0159d28>] (cpu_startup_entry+0x28/0x2c) > [<c0159d28>] (cpu_startup_entry) from [<c0be76c8>] (rest_init+0xd8/0xdc) > [<c0be76c8>] (rest_init) from [<c1200f50>] (start_kernel+0x41c/0x430) > > Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx> > --- > drivers/soc/tegra/pmc.c | 2 -- > 1 file changed, 2 deletions(-) Applied to for-4.21/soc, thanks. Thierry
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