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4eda11175f
efi_switch_mm() is a wrapper around switch_mm() which saves current's ->active_mm, sets the requests mm as ->active_mm and invokes switch_mm(). I don't think that task_lock() is required during that procedure. It protects ->mm which isn't changed here. It needs to be mentioned that during the whole procedure (switch to EFI's mm and back) the preemption needs to be disabled. A context switch at this point would reset the cr3 value based on current->mm. Also, this function may not be invoked at the same time on a different CPU because it would overwrite the efi_scratch.prev_mm information. Remove task_lock() and also update the comment to reflect it. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.