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Shutemov" To: "Matthew Wilcox (Oracle)" Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org Subject: Re: [PATCH 1/4] mm: Introduce and use page_cache_empty Message-ID: <20200806232400.s7nhmnoi3tkk7p2r@box> References: <20200804161755.10100-1-willy@infradead.org> <20200804161755.10100-2-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200804161755.10100-2-willy@infradead.org> X-Rspamd-Queue-Id: 4973C10097AA0 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Aug 04, 2020 at 05:17:52PM +0100, Matthew Wilcox (Oracle) wrote: > diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h > index 484a36185bb5..a474a92a2a72 100644 > --- a/include/linux/pagemap.h > +++ b/include/linux/pagemap.h > @@ -18,6 +18,11 @@ > > struct pagevec; > > +static inline bool page_cache_empty(struct address_space *mapping) > +{ > + return xa_empty(&mapping->i_pages); What about something like bool empty = xa_empty(&mapping->i_pages); VM_BUG_ON(empty && mapping->nrpages); return empty; ? > +} > + > /* > * Bits in mapping->flags. > */ -- Kirill A. Shutemov