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The PREEMPT_RT specific disabling of irqs in __cmpxchg_double_slab() (through slab_[un]lock()) is unnecessary as bit_spin_lock() disables preemption and that's sufficient on PREEMPT_RT where no allocation/free operation is performed in hardirq context and so can't interrupt the current operation. That means we no longer need the slab_[un]lock() wrappers, so delete them and rename the current __slab_[un]lock() to slab_[un]lock(). Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: David Rientjes <rientjes@google.com> Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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.