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When using e8860(gcn1) on arm64, the kernel crashed on drm/radeon: [ 11.240414] pc : __memset+0x4c/0x188 [ 11.244101] lr : radeon_uvd_get_create_msg+0x114/0x1d0 [radeon] [ 11.249995] sp : ffff00000d7eb700 [ 11.253295] x29: ffff00000d7eb700 x28: ffff8001f632a868 [ 11.258585] x27: 0000000000040000 x26: ffff00000de00000 [ 11.263875] x25: 0000000000000125 x24: 0000000000000001 [ 11.269168] x23: 0000000000000000 x22: 0000000000000005 [ 11.274459] x21: ffff00000df24000 x20: ffff8001f74b4000 [ 11.279753] x19: 0000000000124000 x18: 0000000000000020 [ 11.285043] x17: 0000000000000000 x16: 0000000000000000 [ 11.290336] x15: ffff000009309000 x14: ffffffffffffffff [ 11.290340] x13: ffff0000094b6f88 x12: ffff0000094b6bd2 [ 11.290343] x11: ffff00000d7eb700 x10: ffff00000d7eb700 [ 11.306246] x9 : ffff00000d7eb700 x8 : ffff00000df2402c [ 11.306254] x7 : 0000000000000000 x6 : ffff0000094b626a [ 11.306257] x5 : 0000000000000000 x4 : 0000000000000004 [ 11.306262] x3 : ffffffffffffffff x2 : 0000000000000fd4 [ 11.306265] x1 : 0000000000000000 x0 : ffff00000df2402c [ 11.306272] Call trace: [ 11.306316] __memset+0x4c/0x188 [ 11.306638] uvd_v1_0_ib_test+0x70/0x1c0 [radeon] [ 11.306758] radeon_ib_ring_tests+0x54/0xe0 [radeon] ... Obviously, the __memset call is generated by gcc(8.3.1). It optimizes this for loop into memset. But this may break on some platforms which cannot map device memory correctly. So, just invoke `writel` to handle this. v3 (chk): minor cleanups in code and commit message Signed-off-by: Chen Li <chenli@uniontech.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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.
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.