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060a7cf7a7
The write or read request buffers may or may not be a highmem page highmem or not allocated page, so the page->virtual will be NULL, kmap it always need. BUG: [ 25.928352] Unable to handle kernel paging request at virtual address 0 [ 31.721348] pgd = a13fe17e [ 31.724062] [0] *pgd=00000000 [ 31.727651] Internal error: Oops: 5 [#1] PREEMPT SMP ARM [ 31.732966] Modules linked in: Change-Id: Icdbb052bb488ecc10be1c8a8b0ca954f65c17474 Signed-off-by: Yifeng Zhao <zyf@rock-chips.com>
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.