Re: [PATCH] ppc64: update to use the new 4L headers

From: Nick Piggin
Date: Wed Apr 27 2005 - 21:16:50 EST

Chris Friesen wrote:
Nick Piggin wrote:

Just a bit off-topic: I wonder how many more of these open
coded pt walks exist in arch code (yes I see you've cleaned
yours up - good).

I know there's open coded walks outside the tree (I maintain one) due to there being no suitable function available from with in it...

Oh - I meant hand calculating the addresses rather than using
the pmd_addr_end and friends... but:

I needed something like:

pte_t *va_to_ptep_map(struct mm_struct *mm, unsigned int addr)

There was code in follow_page() that did basically what I needed, but it was all contained within that function so I had to re-implement it.

If you can break out exactly what you need, and make that inline
or otherwise available via the correct header, I'm sure it would
have a good chance of being merged.

Keep in mind that you shouldn't introduce an inefficiency to
follow_page, however if that is not possible you could simply
duplicate what you need in a seperate function in mm/memory.c and
use that - better to do it once there than a lot of times in
random places.

SUSE Labs, Novell Inc.

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