Re: [microblaze-uclinux] [patch] r17 must be saved

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Yashi,

Yasushi SHOJI wrote:

> One of my colleagues pin this bug down. Currently r17 is not saved in
> irq.
> 
> here is the senario:
> 
> - Process A call one of syscalls, which save returning point to r17
> 
> - a timer interrupt occur, save most of registers except r17
> 
> - at the end of interrupt, need_resched is checked.  we switch from
> process A to Process B
> 
> - Process B call one of syscalls, over writing Process A's returning
> point in r17
> 
> the following patch fixes this bug, but not sure how John want to fix
> it.

Fix looks good as-is - applied to CVS.

Thanks for finding it.  Just curious - what was the symptom?  Must have 
been a devil to track down!

John
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