What an unpleasing patchset. I really really hope we really have a bug in
there, and that all this crap isn't pointless uglification.
We _do_ need a flush_dcaceh_page() in all cases which you're concerned
about. Perhaps we should stick the appropriate barriers in there.
> On Thu, 15 Feb 2007 08:31:31 +0100 (CET) Nick Piggin <[email protected]> wrote:
> +static inline void SetNewPageUptodate(struct page *page)
> +{
> + /*
> + * S390 sets page dirty bit on IO operations, which is why it is
> + * cleared in SetPageUptodate. This is not an issue for newly
> + * allocated pages that are brought uptodate by zeroing memory.
> + */
> + smp_wmb();
> + __set_bit(PG_uptodate, &(page)->flags);
> +}
__SetPageUptodate() might be more conventional.
Boy we'd better get the callers of this little handgrenade right.
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