Messages in this thread | | | Date | Sat, 14 Nov 2020 15:22:52 +0000 | From | Matthew Wilcox <> | Subject | Re: [PATCH v4 13/16] mm: Pass pvec directly to find_get_entries |
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On Sat, Nov 14, 2020 at 11:21:33AM +0100, Christoph Hellwig wrote: > On Thu, Nov 12, 2020 at 09:26:38PM +0000, Matthew Wilcox (Oracle) wrote: > > + pvec->nr = ret; > > return ret; > > Do we need to return the number of found entries in addition to storing > it in the pagevec?
We really only need a bool -- is pvec->nr zero or not. But we have the number calculated so we may as well return it. All the current find_*() behave this way and I haven't seen enough reason to change it yet. Making it return void just makes the callers uglier. I have a batch of patches to do something similar for find_get_pages / find_get_pages_range / pagevec_lookup / pagevec_lookup_range, but I don't need them for the THP patchset, so I haven't sent them yet.
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