82e269ad8a
crypto_disable_simd_for_test() disables preemption in order to receive a stable per-CPU variable which it needs to modify in order to alter crypto_simd_usable() results. This can also be achived by migrate_disable() which forbidds CPU migrations but allows the task to be preempted. The latter is important for PREEMPT_RT since operation like skcipher_walk_first() may allocate memory which must not happen with disabled preemption on PREEMPT_RT. Use migrate_disable() in crypto_disable_simd_for_test() to achieve a stable per-CPU pointer. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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.