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[2003:dc:6f4f:9200:230:64ff:fe74:809]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a68fa49e66fsm328376766b.129.2024.06.04.02.09.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Jun 2024 02:09:13 -0700 (PDT) From: Max Kellermann To: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: willy@infradead.org, sfr@canb.auug.org.au, david@redhat.com, Max Kellermann Subject: [PATCH v6 06/15] linux/mm.h: move page_address() and others to mm/page_address.h Date: Tue, 4 Jun 2024 11:08:36 +0200 Message-Id: <20240604090845.2182265-7-max.kellermann@ionos.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240604090845.2182265-1-max.kellermann@ionos.com> References: <20240604090845.2182265-1-max.kellermann@ionos.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Prepare to reduce dependencies on linux/mm.h. page_address() is used by the following popular headers: - linux/bio.h - linux/bvec.h - linux/highmem.h - linux/scatterlist.h - linux/skbuff.h Moving it to a separate lean header will allow us to avoid the dependency on linux/mm.h. Signed-off-by: Max Kellermann --- include/linux/mm.h | 56 +------------------------- include/linux/mm/page_address.h | 71 +++++++++++++++++++++++++++++++++ 2 files changed, 72 insertions(+), 55 deletions(-) create mode 100644 include/linux/mm/page_address.h diff --git a/include/linux/mm.h b/include/linux/mm.h index c9a3f1c0ae07..014db2b39c16 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2,7 +2,7 @@ #ifndef _LINUX_MM_H #define _LINUX_MM_H =20 -#include +#include #include #include #include @@ -105,10 +105,6 @@ extern int mmap_rnd_compat_bits __read_mostly; #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) #endif =20 -#ifndef page_to_virt -#define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) -#endif - #ifndef lm_alias #define lm_alias(x) __va(__pa_symbol(x)) #endif @@ -212,14 +208,6 @@ int overcommit_kbytes_handler(struct ctl_table *, int,= void *, size_t *, int overcommit_policy_handler(struct ctl_table *, int, void *, size_t *, loff_t *); =20 -#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) -#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) -#define folio_page_idx(folio, p) (page_to_pfn(p) - folio_pfn(folio)) -#else -#define nth_page(page,n) ((page) + (n)) -#define folio_page_idx(folio, p) ((p) - &(folio)->page) -#endif - /* to align the pointer to the (next) page boundary */ #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) =20 @@ -2174,44 +2162,6 @@ static inline int arch_make_folio_accessible(struct = folio *folio) */ #include =20 -#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) -#define HASHED_PAGE_VIRTUAL -#endif - -#if defined(WANT_PAGE_VIRTUAL) -static inline void *page_address(const struct page *page) -{ - return page->virtual; -} -static inline void set_page_address(struct page *page, void *address) -{ - page->virtual =3D address; -} -#define page_address_init() do { } while(0) -#endif - -#if defined(HASHED_PAGE_VIRTUAL) -void *page_address(const struct page *page); -void set_page_address(struct page *page, void *virtual); -void page_address_init(void); -#endif - -static __always_inline void *lowmem_page_address(const struct page *page) -{ - return page_to_virt(page); -} - -#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) -#define page_address(page) lowmem_page_address(page) -#define set_page_address(page, address) do { } while(0) -#define page_address_init() do { } while(0) -#endif - -static inline void *folio_address(const struct folio *folio) -{ - return page_address(&folio->page); -} - /* * Return true only if the page has been allocated with * ALLOC_NO_WATERMARKS and the low watermark was not @@ -2261,10 +2211,6 @@ static inline void clear_page_pfmemalloc(struct page= *page) */ extern void pagefault_out_of_memory(void); =20 -#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) -#define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1)) -#define offset_in_folio(folio, p) ((unsigned long)(p) & (folio_size(folio)= - 1)) - /* * Parameter block passed down to zap_pte_range in exceptional cases. */ diff --git a/include/linux/mm/page_address.h b/include/linux/mm/page_addres= s.h new file mode 100644 index 000000000000..630fc4e2be95 --- /dev/null +++ b/include/linux/mm/page_address.h @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_MM_PAGE_ADDRESS_H +#define _LINUX_MM_PAGE_ADDRESS_H + +#include // for struct page +#include // needed by the page_to_virt() macro= on some architectures (e.g. arm64) +#include // for PAGE_MASK, page_to_virt() + +#if defined(CONFIG_FLATMEM) +#include // for memmap (used by __pfn_to_page()) +#elif defined(CONFIG_SPARSEMEM_VMEMMAP) +#include // for vmemmap (used by __pfn_to_page()) +#elif defined(CONFIG_SPARSEMEM) +#include // for page_to_section() (used by __pag= e_to_pfn()) +#endif + +#ifndef page_to_virt +#define page_to_virt(x) __va(PFN_PHYS(page_to_pfn(x))) +#endif + +#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) +#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) +#define folio_page_idx(folio, p) (page_to_pfn(p) - folio_pfn(folio)) +#else +#define nth_page(page,n) ((page) + (n)) +#define folio_page_idx(folio, p) ((p) - &(folio)->page) +#endif + +#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) +#define HASHED_PAGE_VIRTUAL +#endif + +#if defined(WANT_PAGE_VIRTUAL) +static inline void *page_address(const struct page *page) +{ + return page->virtual; +} +static inline void set_page_address(struct page *page, void *address) +{ + page->virtual =3D address; +} +#define page_address_init() do { } while(0) +#endif + +#if defined(HASHED_PAGE_VIRTUAL) +void *page_address(const struct page *page); +void set_page_address(struct page *page, void *virtual); +void page_address_init(void); +#endif + +static __always_inline void *lowmem_page_address(const struct page *page) +{ + return page_to_virt(page); +} + +#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) +#define page_address(page) lowmem_page_address(page) +#define set_page_address(page, address) do { } while(0) +#define page_address_init() do { } while(0) +#endif + +static inline void *folio_address(const struct folio *folio) +{ + return page_address(&folio->page); +} + +#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) +#define offset_in_thp(page, p) ((unsigned long)(p) & (thp_size(page) - 1)) +#define offset_in_folio(folio, p) ((unsigned long)(p) & (folio_size(folio)= - 1)) + +#endif /* _LINUX_MM_PAGE_ADDRESS_H */ --=20 2.39.2