143c2a89e0
When running kprobe on -rt kernel, the below bug is caught: |BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:931 |in_atomic(): 1, irqs_disabled(): 128, pid: 14, name: migration/0 |Preemption disabled at:[<802f2b98>] cpu_stopper_thread+0xc0/0x140 |CPU: 0 PID: 14 Comm: migration/0 Tainted: G O 4.8.3-rt2 #1 |Hardware name: Freescale LS1021A |[<8025a43c>] (___might_sleep) |[<80b5b324>] (rt_spin_lock) |[<80b5c31c>] (__patch_text_real) |[<80b5c3ac>] (patch_text_stop_machine) |[<802f2920>] (multi_cpu_stop) Since patch_text_stop_machine() is called in stop_machine() which disables IRQ, sleepable lock should be not used in this atomic context, so replace patch_lock to raw lock. Signed-off-by: Yang Shi <yang.shi@linaro.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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.
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.