On Thu, 2007-08-02 at 11:37 +1000, Benjamin Herrenschmidt wrote:
> Heya !
>
> In my page table accessor spring cleaning, one of my targets is
> flush_tlb_page(). At this stage, it's only called by generic code in one
> place (in addition to the asm-generic bits that use it to implement
> missing accessors, but I'm taking care of those spearately) :
.../...
No reply, so I suppose I can rip it out ? :-)
Thus any reason why that patch wouln't fly ? (not for 2.6.23 of course)
This removes the last occurence of flush_tlb_page() from generic code,
thus making this hook now optional for architectures that don't use
the helpers in asm-generic/pgtable.h
I couldn't find a case where this is actually needed, but I may well
have missed something. If I did though, please tell me what. If an
architecture need that call for obscure reason, it could be simply
folded in that architecture's implementation ptep_set_access_flags().
Signed-off-by: Benjamin Herrenschmidt <[email protected]>
---
Index: linux-work/mm/memory.c
===================================================================
--- linux-work.orig/mm/memory.c 2007-08-06 16:32:12.000000000 +1000
+++ linux-work/mm/memory.c 2007-08-06 16:34:07.000000000 +1000
@@ -2609,15 +2609,6 @@ static inline int handle_pte_fault(struc
if (ptep_set_access_flags(vma, address, pte, entry, write_access)) {
update_mmu_cache(vma, address, entry);
lazy_mmu_prot_update(entry);
- } else {
- /*
- * This is needed only for protection faults but the arch code
- * is not yet telling us if this is a protection fault or not.
- * This still avoids useless tlb flushes for .text page faults
- * with threads.
- */
- if (write_access)
- flush_tlb_page(vma, address);
}
unlock:
pte_unmap_unlock(pte, ptl);
-
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