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delta_time==0 may happen by chance when irq_work and idle_end come together, but it is ok, cpufreq_interactive will correct it next period. [ 6559.355576] WARNING: CPU: 5 PID: 0 at drivers/cpufreq/cpufreq_interactive.c:395 eval_target_freq+0x640/0x670 [ 6559.355604] Modules linked in: [ 6559.355618] CPU: 5 PID: 0 Comm: swapper/5 Not tainted 4.19.111 #252 [ 6559.355624] Hardware name: Rockchip RK3399 Evaluation Board v3 (Android) (DT) [ 6559.355631] pstate: 20400005 (nzCv daif +PAN -UAO) [ 6559.355636] pc : eval_target_freq+0x640/0x670 [ 6559.355642] lr : eval_target_freq+0xc4/0x670 [ 6559.360919] Call trace: [ 6559.360951] eval_target_freq+0x640/0x670 [ 6559.360972] cpufreq_interactive_update+0x1c/0xbc [ 6559.361000] cpufreq_interactive_idle_notifier+0x98/0xb4 [ 6559.361026] atomic_notifier_call_chain+0x4c/0x84 [ 6559.361065] idle_notifier_call_chain+0x1c/0x24 [ 6559.361089] arch_cpu_idle_exit+0x10/0x18 [ 6559.361119] do_idle+0x8c/0x288 [ 6559.361138] cpu_startup_entry+0x20/0x24 [ 6559.361169] secondary_start_kernel+0x138/0x144 [ 6559.361203] ---[ end trace c8c6e336a23d6818 ]--- Change-Id: I413b84b964e557935a353dab1e67cebed00c6754 Signed-off-by: Liang Chen <cl@rock-chips.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
Description
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