Prepare for adding psind == 1 support to armv6's pmap_enter()
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Authored by alc on Jul 25 2018, 6:04 PM.

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kib
markj
mmel

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rS336881: Prepare for adding psind == 1 support to armv6's pmap_enter().

Summary

Precompute the new PTE before entering the critical section.

Eliminate duplication of the pmap and pv list unlock operations in pmap_enter() by implementing a single return path. Otherwise, the duplication will only increase with the upcoming support for psind == 1.

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alc created this revision.Jul 25 2018, 6:04 PM

Could you re-upload the patch with more context, please?

Provide full context, i.e., the entire function.

kib added inline comments.Jul 26 2018, 6:31 PM

arm/arm/pmap-v6.c
4073	This should be return (rv); now, for 'goto out' to work ?

alc added inline comments.Jul 26 2018, 6:53 PM

arm/arm/pmap-v6.c
4073	Indeed. Thank you.

Correct the return value.

alc marked 2 inline comments as done.Jul 26 2018, 6:55 PM

alc added inline comments.Jul 26 2018, 7:02 PM

arm/arm/pmap-v6.c
3991	In a separate change, someone should replace the pte2_is_managed() here and a couple other places by a PG_UNMANAGED test on m. Unlike x86, armv6 doesn't have an actual PTE2_MANAGED bit in the PTE, so this winds up being a more expensive PHYS_TO_VM_PAGE() just to get the vm_page_t and a PG_UNMANAGED test on that page. When, in several instance, we already have the vm_page_t.