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[ 4.239358] Unable to handle kernel NULL pointer dereference at virtual address 00000050 [ 4.263110] pgd = (ptrval) [ 4.269464] [00000050] *pgd=00000000 [ 4.285610] Internal error: Oops: 5 [#1] PREEMPT SMP ARM [ 4.291283] Modules linked in: [ 4.294795] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.111 #1960 [ 4.301399] Hardware name: Generic DT based system [ 4.306660] PC is at mpp_set_grf+0x8/0x3c [ 4.311054] LR is at mpp_add_driver+0x24/0x44 [ 4.315713] pc : [<b03d7b44>] lr : [<b03d50d8>] psr: 20000153 [ 4.322250] sp : bf039ee8 ip : 00000d8c fp : bf7ffd80 [ 4.327740] r10: b0b3003c r9 : 00000007 r8 : 00000000 [ 4.333260] r7 : b0b15914 r6 : b0f21788 r5 : 00000006 r4 : b1022a2c [ 4.340094] r3 : 00000048 r2 : bf5d1e24 r1 : b0f21788 r0 : 00000048 [ 4.346947] Flags: nzCv IRQs on FIQs off Mode SVC_32 ISA ARM Segment user [ 4.354487] Control: 10c5387d Table: 6000406a DAC: 00000055 Change-Id: Idad72d462da59a8af53fd038ceda973da1f4139d Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com> Signed-off-by: Ding Wei <leo.ding@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.