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As per below information GFP_KERNEL FLAG This is a normal allocation and might block. This is the flag to use in process context code when it is safe to sleep. GFP_ATOMIC FLAG The allocation is high-priority and does not sleep. This is the flag to use in interrupt handlers, bottom halves and other situations where you cannot sleep And we can take advantage of GFP_KERNEL , as when system is in low memory chances of getting success is high compared to GFP_ATOMIC. As visornic_probe is in process context we can use GPF_KERNEL. Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.
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.