I've added the ppc64 list to the addressees, in case they are interested.
Marcelo Tosatti wrote:
On Tue, Feb 01, 2005 at 04:50:16PM +0100, Arjan van de Ven wrote:
afaik one doesn't need to do a tlb flush in code that clears the dirty
bit, as long as you use the proper vm functions to do so. (if those need a tlb flush, those are supposed to do that for you
afaik).
Yep, and "proper VM function" is include/asm-generic/pgtable.h::ptep_clear_flush_dirty(), which on PPC flushes the TLB.
It turns out that to call ptep_clear_flush_dirty() on ppc64 from a module I needed to export the following symbols:
__flush_tlb_pending ppc64_tlb_batch hpte_update
Also note that your code isn't dealing with 4 level pagetables.... And pagetable walking in drivers is basically almost always a mistake and a sign that something is wrong.
Or a sign that the core kernel lacks helper functions :)
Absolutely. It'd be so nice if there was a simple va_to_ptep() helper function available.
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