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

From: Christophe Leroy
Date: Thu Dec 20 2018 - 03:50:07 EST

Le 20/12/2018 Ã 09:24, Christoph Hellwig a ÃcritÂ:
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 ?