[PATCH] powerpc/8xx: fix regression introduced by cache coherency rewrite

Benjamin Herrenschmidt benh at kernel.crashing.org
Tue Oct 6 07:28:05 EST 2009

On Mon, 2009-10-05 at 21:16 +0200, Joakim Tjernlund wrote:
> Ben, for my understanding: It seems to that the TLB Miss routines in
> head_32.S are less than optimal as it too touches the pte every time
> it hits. Would it not be better to test if ACCESSED and friends are
> already set
> and skip storing the same pte over and over again?

I wouldn't think it's a big deal, but then, the 32-bit hash code
has to also update _PAGE_HASHPTE etc... overall I wouldn't touch
it for now.

However, 8xx should instead look at what I do in recent versions
of head_44x.S or what Kumar did in head_fsl_booke.S


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