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authorMax Filippov <jcmvbkbc@gmail.com>2018-01-29 18:09:41 +0100
committerMax Filippov <jcmvbkbc@gmail.com>2019-01-25 01:01:07 +0100
commit4fe8713b873fc881284722ce4ac47995de7cf62c (patch)
treea0f59cd76c820fc96107b5491936ad1581fb6867 /ipc/ipc_sysctl.c
parentLinux 5.0-rc3 (diff)
downloadlinux-4fe8713b873fc881284722ce4ac47995de7cf62c.tar.xz
linux-4fe8713b873fc881284722ce4ac47995de7cf62c.zip
xtensa: SMP: fix ccount_timer_shutdown
ccount_timer_shutdown is called from the atomic context in the secondary_start_kernel, resulting in the following BUG: BUG: sleeping function called from invalid context in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/1 Preemption disabled at: secondary_start_kernel+0xa1/0x130 Call Trace: ___might_sleep+0xe7/0xfc __might_sleep+0x41/0x44 synchronize_irq+0x24/0x64 disable_irq+0x11/0x14 ccount_timer_shutdown+0x12/0x20 clockevents_switch_state+0x82/0xb4 clockevents_exchange_device+0x54/0x60 tick_check_new_device+0x46/0x70 clockevents_register_device+0x8c/0xc8 clockevents_config_and_register+0x1d/0x2c local_timer_setup+0x75/0x7c secondary_start_kernel+0xb4/0x130 should_never_return+0x32/0x35 Use disable_irq_nosync instead of disable_irq to avoid it. This is safe because the ccount timer IRQ is per-CPU, and once IRQ is masked the ISR will not be called. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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