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checkpatch advises that WARN_ON and recovery code are preferred over BUG_ON which crashes the kernel. l2tp_ppp.c's BUG_ON checks of the l2tp session structure's "magic" field occur in code paths where it's reasonably easy to recover: * In the case of pppol2tp_sock_to_session, we can return NULL and the caller will bail out appropriately. There is no change required to any of the callsites of this function since they already handle pppol2tp_sock_to_session returning NULL. * In the case of pppol2tp_session_destruct we can just avoid decrementing the reference count on the suspect session structure. In the worst case scenario this results in a memory leak, which is preferable to a crash. Convert these uses of BUG_ON to WARN_ON accordingly. Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.