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write_msg(netconsole.c:836) calls netpoll_send_udp after a call to spin_lock_irqsave, which normally disables interrupts; but in PREEMPT_RT this call just locks an rt_mutex without disabling irqs. In this case, netpoll_send_udp is called with interrupts enabled. Signed-off-by: Wander Lairson Costa <wander@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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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.
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