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f7a1c6f2a1
up_read() may wakeup some tasks, so do not call up_read() in scheduler,
or it will cause deadlock as below:
Thread #4 5 (Name: cpu3, state: debug-request) (Suspended : Container)
queued_spin_lock_slowpath() at qspinlock.c:369 0xffffff8008119120
queued_spin_lock() at qspinlock.h:88 0xffffff8008f0a470
do_raw_spin_lock() at spinlock.h:180 0xffffff8008f0a470
__raw_spin_lock() at spinlock_api_smp.h:143 0xffffff8008f0a470
_raw_spin_lock() at spinlock.c:144 0xffffff8008f0a470
rq_lock() at sched.h:1,244 0xffffff80080f2f4c
ttwu_queue() at core.c:2,442 0xffffff80080f2f4c
try_to_wake_up() at core.c:2,658 0xffffff80080eb998
wake_up_q() at core.c:450 0xffffff80080eb6a8
rwsem_wake() at rwsem-xadd.c:703 0xffffff800811a44c
__up_read() at rwsem.h:107 0xffffff8008118930
up_read() at rwsem.c:122 0xffffff8008118930
cpufreq_task_boost() at cpufreq_interactive.c:1,449 0xffffff8008a4bdb4
enqueue_task_fair() at fair.c:5,285 0xffffff80080f7814
enqueue_task() at core.c:1,324 0xffffff80080ec15c
activate_task() at core.c:1,346 0xffffff80080ec15c
ttwu_activate() at core.c:2,240 0xffffff80080f2fc0
ttwu_do_activate() at core.c:2,299 0xffffff80080f2fc0
ttwu_queue() at core.c:2,444 0xffffff80080f2fc0
try_to_wake_up() at core.c:2,658 0xffffff80080eb998
wake_up_q() at core.c:450 0xffffff80080eb6a8
futex_wake() at futex.c:1,636 0xffffff8008159e78
do_futex() at futex.c:3,714 0xffffff8008158fb0
__do_sys_futex() at futex.c:3,770 0xffffff800815bd98
__se_sys_futex() at futex.c:3,738 0xffffff800815bd98
__arm64_sys_futex() at futex.c:3,738 0xffffff800815bd98
__invoke_syscall() at syscall.c:36 0xffffff8008098d6c
invoke_syscall() at syscall.c:48 0xffffff8008098d6c
el0_svc_common() at syscall.c:117 0xffffff8008098d6c
el0_svc_handler() at syscall.c:163 0xffffff8008098ccc
el0_svc() at entry.S:940 0xffffff8008083d08
Fixes: 2d367d61e8 (cpufreq: interactive: introduce boost cpufreq interface for task)
Change-Id: I9607faa5ede3a662e7f2f55da29b08fc328f4d43
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.