[PATCH] powerpc/8xx: Map a second 8M text page at startup when needed.

Christophe Leroy christophe.leroy at c-s.fr
Thu Dec 20 19:50:03 AEDT 2018



Le 20/12/2018 à 09:24, Christoph Hellwig a écrit :
> On Thu, Dec 20, 2018 at 05:48:25AM +0000, Christophe Leroy wrote:
>> Some debug setup like CONFIG_KASAN generate huge
>> kernels with text size over the 8M limit.
>>
>> This patch maps a second 8M page when _einittext is over 8M.
> 
> Do we also need a check to generate a useful warning if we ever overflow
> the 16MB?
> 

I don't think any other platform does that (the 40x also maps 16Mb, 
book3s/601 maps 24Mb)

But why not, could do that in another patch.

Is there an easy way to get the link to fail when CONFIG_PIN_TLB_TEXT is 
set and _einittext is higher than 16Mb ?

Or should we just map up to 24Mb on the 8xx and consider we are on the 
safe side with that much ?

Christophe


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