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

Christophe Leroy
2018-12-20T08:50:06Z

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