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([1.245.179.104]) by smtp.gmail.com with ESMTPSA id u18-20020aa78392000000b006827c26f147sm4346601pfm.138.2023.07.12.21.20.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Jul 2023 21:20:58 -0700 (PDT) From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: Minchan Kim , Sergey Senozhatsky Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Matthew Wilcox , Mike Rapoport , Hyeonggon Yoo <42.hyeyoo@gmail.com> Subject: [RFC PATCH v2 02/21] mm/zsmalloc: add utility functions for zsdesc Date: Thu, 13 Jul 2023 13:20:17 +0900 Message-ID: <20230713042037.980211-3-42.hyeyoo@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230713042037.980211-1-42.hyeyoo@gmail.com> References: <20230713042037.980211-1-42.hyeyoo@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Introduce basic utility functions for zsdesc to avoid directly accessing fields of struct page. More helpers will be defined later. zsdesc_page() is defined with _Generic to preserve constness. page_zsdesc() does not call compound_head() because zsdesc is always a base page. Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> --- mm/zsmalloc.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 2204bea4f289..11c203e79c39 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -293,6 +293,39 @@ ZSDESC_MATCH(_refcount, _refcount); #undef ZSDESC_MATCH static_assert(sizeof(struct zsdesc) <=3D sizeof(struct page)); =20 +#define zsdesc_page(zdesc) (_Generic((zdesc), \ + const struct zsdesc *: (const struct page *)zdesc, \ + struct zsdesc *: (struct page *)zdesc)) + +static inline struct zsdesc *page_zsdesc(struct page *page) +{ + return (struct zsdesc *)page; +} + +static inline unsigned long zsdesc_pfn(const struct zsdesc *zsdesc) +{ + return page_to_pfn(zsdesc_page(zsdesc)); +} + +static inline struct zsdesc *pfn_zsdesc(unsigned long pfn) +{ + return page_zsdesc(pfn_to_page(pfn)); +} + +static inline void zsdesc_get(struct zsdesc *zsdesc) +{ + struct folio *folio =3D (struct folio *)zsdesc; + + folio_get(folio); +} + +static inline void zsdesc_put(struct zsdesc *zsdesc) +{ + struct folio *folio =3D (struct folio *)zsdesc; + + folio_put(folio); +} + /* huge object: pages_per_zspage =3D=3D 1 && maxobj_per_zspage =3D=3D 1 */ static void SetZsHugePage(struct zspage *zspage) { --=20 2.41.0