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[121.45.173.48]) by smtp.gmail.com with ESMTPSA id g2sm3338277pfi.28.2021.03.18.16.56.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Mar 2021 16:56:48 -0700 (PDT) Date: Fri, 19 Mar 2021 10:56:45 +1100 From: Balbir Singh To: "Matthew Wilcox (Oracle)" Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v4 01/25] mm: Introduce struct folio Message-ID: <20210318235645.GB3346@balbir-desktop> References: <20210305041901.2396498-1-willy@infradead.org> <20210305041901.2396498-2-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210305041901.2396498-2-willy@infradead.org> X-Stat-Signature: ifw88bhf7yfexzgmy4ko858xe1crxfu3 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 86FB36000119 Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf09; identity=mailfrom; envelope-from=""; helo=mail-pj1-f54.google.com; client-ip=209.85.216.54 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616111818-90542 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000095, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Mar 05, 2021 at 04:18:37AM +0000, Matthew Wilcox (Oracle) wrote: > A struct folio refers to an entire (possibly compound) page. A function > which takes a struct folio argument declares that it will operate on the > entire compound page, not just PAGE_SIZE bytes. In return, the caller > guarantees that the pointer it is passing does not point to a tail page. > Is this a part of a larger use case or general cleanup/refactor where the split between page and folio simplify programming? Balbir Singh.