Rohit Seth wrote:
and
it's only interested when it's executable i.e. "lazy_mmu_prot_update"
is a name concealing some overdesign.
You are right that ia64 is only interested in whne the execute permissions
kick in (and FWIW ia64 used to use update_mmu_cache API to do what it is now
doing lazy_mmu_prot_update). Though the idea was to design an API that any
arch can use to know when ever there is change in protections on a mapping.
What I think what we should do is audit flush_icache_page coverage, and
convert ia64 to use that (because it needs this to happen _before_ the
pte is set).
All we should need to do is add a pte argument to flush_icache, and it
should be possible to do what ia64 wants, and we can remove
lazy_mmu_prot_update (or at least rename it to something like
flush_icache_page_chprot and move it to the normal flush_icache_page
position above set_pte if not all architectures want their
flush_icache_page called at protection change time).
--
SUSE Labs, Novell Inc.
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