Re: [PATCH 2/4] powerpc: Fix 32 bits mm operations when not using BATs

[Segher Boessenkool <segher@kernel.crashing.org>]

> +	 * If the hash table bucket is full of kernel text entries, we'll
> +	 * lockup here but that shouldn't happen

On 32-bit we have room for one HPTE per real page -- assuming
the kernel text is fully enclosed inside one power-of-two
size and aligned range of address space (i.e. always ;-) ),
a lockup here _cannot_ happen.  It doesn't get tight until you
start using all of memory as kernel text.

So replace this comment with something like "the HTAB is
sized such that no PTEG can overflow from kernel text alone"?
It sounds a lot less hand-wavy than "but this shouldn't happen".


Segher