[Nouveau] [Bug 96836] Kernel unaligned access at TPC[105d9fb4] nvkm_instobj_wr32+0x14/0x20 [nouveau]

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Jul 10 02:58:12 UTC 2016


https://bugs.freedesktop.org/show_bug.cgi?id=96836

--- Comment #14 from Ilia Mirkin <imirkin at alum.mit.edu> ---
OK, well let's start small. One source of problems is that we have

drivers/gpu/drm/nouveau/nouveau_bios.h:#define ROM16(x) le16_to_cpu(*(u16
*)&(x))

Which can only work on aligned pointers x, but it gets called with unaligned
offsets in nouveau_bios.c

Can you try changing that to

#define ROM16(x) get_unaligned_le16(&(x))

I'm guessing that will help with the first group of unaligned traps.

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