Messages in this thread | | | Date | Fri, 30 May 2003 16:00:02 -0700 | From | Jun Sun <> | Subject | Re: Properly implement flush_dcache_page in 2.4? (Or is it possible?) |
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On Fri, May 30, 2003 at 07:09:29PM +0100, Russell King wrote: > On Fri, May 30, 2003 at 10:32:54AM -0700, Jun Sun wrote: > > So my question is: how other CPU arches with the same problem > > implement flush_dcache_page()? Flushing the whole cache? Or > > have a broken implementation and pretend it is OK? :) > > See __flush_dcache_page() in arch/arm/mm/fault-armv.c in 2.5.70. >
Is this routine tested to be working? At least passing a page index as a full virtual address to flush_cache_page() looks suspicious.
In addition, I am not sure if the vma struct will show up in the "shared" list _if_ the page is only mapped in one user process and in kernel (for example, those pages you obtain through get_user_pages() call).
I am not familiar with 2.5 kernel. I was under impression that reverse page mapping might provide an easy solution to this problem.
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