> Maybe it would be interesting to know from which patch the error comes.

It’s hard to attribute this to a single commit, but the distance between r10’s 
save
location and r11-r12’s save location has definitely grown over time. The 
comment is
introduced in commit 7180e3e636de
("[POWERPC] force 64bit mode in fwnmi handlers to workaround firmware bugs”) 
way back in 2006.

In v3 will insert another comment to better signal where r11-r12 are saved.

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