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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20210715033704.692967-86-willy@infradead.org> References: <20210715033704.692967-86-willy@infradead.org> <20210715033704.692967-1-willy@infradead.org> To: "Matthew Wilcox (Oracle)" Cc: dhowells@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Christoph Hellwig Subject: Re: [PATCH v14 085/138] mm/filemap: Add filemap_alloc_folio MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1814675.1628632478.1@warthog.procyon.org.uk> Date: Tue, 10 Aug 2021 22:54:38 +0100 Message-ID: <1814676.1628632478@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=KOraZ+4k; spf=none (imf17.hostedemail.com: domain of dhowells@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=dhowells@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: C129EF002CAB X-Stat-Signature: i36wnrinf7jhsgkqfy8d4hrtyhntrwf5 X-HE-Tag: 1628632483-656679 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: Matthew Wilcox (Oracle) wrote: > Reimplement __page_cache_alloc as a wrapper around filemap_alloc_folio > to allow filesystems to be converted at our leisure. Increases > kernel text size by 133 bytes, mostly in cachefiles_read_backing_file(). > pagecache_get_page() shrinks by 32 bytes, though. > > Signed-off-by: Matthew Wilcox (Oracle) > Reviewed-by: Christoph Hellwig > ... > +static inline struct page *__page_cache_alloc(gfp_t gfp) > +{ > + return &filemap_alloc_folio(gfp, 0)->page; > +} Might be worth a note that this *will* return NULL if the allocation fails, though I guess it's deprecated? Reviewed-by: David Howells