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Sun, 08 Nov 2020 06:12:51 -0800 (PST) From: Muchun Song To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com, willy@infradead.org, osalvador@suse.de, mhocko@suse.com Cc: duanxiongchun@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song Subject: [PATCH v3 07/21] mm/bootmem_info: Combine bootmem info and type into page->freelist Date: Sun, 8 Nov 2020 22:10:59 +0800 Message-Id: <20201108141113.65450-8-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201108141113.65450-1-songmuchun@bytedance.com> References: <20201108141113.65450-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: The page->private shares storage with page->ptl. In the later patch, we will use the page->ptl. So here we combine bootmem info and type into page->freelist so that we can do not use page->private. Signed-off-by: Muchun Song --- include/linux/bootmem_info.h | 18 ++++++++++++++++-- mm/bootmem_info.c | 12 ++++++------ mm/sparse.c | 4 ++-- 3 files changed, 24 insertions(+), 10 deletions(-) diff --git a/include/linux/bootmem_info.h b/include/linux/bootmem_info.h index ce9d8c97369d..b5786a8b412e 100644 --- a/include/linux/bootmem_info.h +++ b/include/linux/bootmem_info.h @@ -6,7 +6,7 @@ #include =20 /* - * Types for free bootmem stored in page->lru.next. These have to be in + * Types for free bootmem stored in page->freelist. These have to be in * some random range in unsigned long space for debugging purposes. */ enum { @@ -17,6 +17,20 @@ enum { MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE =3D NODE_INFO, }; =20 +#define BOOTMEM_TYPE_BITS 4 +#define BOOTMEM_TYPE_MAX ((1UL << BOOTMEM_TYPE_BITS) - 1) +#define BOOTMEM_INFO_MAX (ULONG_MAX >> BOOTMEM_TYPE_BITS) + +static inline unsigned long page_bootmem_type(struct page *page) +{ + return (unsigned long)page->freelist & BOOTMEM_TYPE_MAX; +} + +static inline unsigned long page_bootmem_info(struct page *page) +{ + return (unsigned long)page->freelist >> BOOTMEM_TYPE_BITS; +} + #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE void __init register_page_bootmem_info_node(struct pglist_data *pgdat); =20 @@ -30,7 +44,7 @@ static inline void free_vmemmap_page(struct page *page) =20 /* bootmem page has reserved flag in the reserve_bootmem_region */ if (PageReserved(page)) { - unsigned long magic =3D (unsigned long)page->freelist; + unsigned long magic =3D page_bootmem_type(page); =20 if (magic =3D=3D SECTION_INFO || magic =3D=3D MIX_SECTION_INFO) put_page_bootmem(page); diff --git a/mm/bootmem_info.c b/mm/bootmem_info.c index fcab5a3f8cc0..9baf163965fd 100644 --- a/mm/bootmem_info.c +++ b/mm/bootmem_info.c @@ -12,9 +12,9 @@ =20 void get_page_bootmem(unsigned long info, struct page *page, unsigned lo= ng type) { - page->freelist =3D (void *)type; - SetPagePrivate(page); - set_page_private(page, info); + BUG_ON(info > BOOTMEM_INFO_MAX); + BUG_ON(type > BOOTMEM_TYPE_MAX); + page->freelist =3D (void *)((info << BOOTMEM_TYPE_BITS) | type); page_ref_inc(page); } =20 @@ -22,14 +22,12 @@ void put_page_bootmem(struct page *page) { unsigned long type; =20 - type =3D (unsigned long) page->freelist; + type =3D page_bootmem_type(page); BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); =20 if (page_ref_dec_return(page) =3D=3D 1) { page->freelist =3D NULL; - ClearPagePrivate(page); - set_page_private(page, 0); INIT_LIST_HEAD(&page->lru); free_reserved_page(page); } @@ -101,6 +99,8 @@ void __init register_page_bootmem_info_node(struct pgl= ist_data *pgdat) int node =3D pgdat->node_id; struct page *page; =20 + BUILD_BUG_ON(MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE > BOOTMEM_TYPE_MAX); + nr_pages =3D PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; page =3D virt_to_page(pgdat); =20 diff --git a/mm/sparse.c b/mm/sparse.c index a4138410d890..fca5fa38c2bc 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -740,12 +740,12 @@ static void free_map_bootmem(struct page *memmap) >> PAGE_SHIFT; =20 for (i =3D 0; i < nr_pages; i++, page++) { - magic =3D (unsigned long) page->freelist; + magic =3D page_bootmem_type(page); =20 BUG_ON(magic =3D=3D NODE_INFO); =20 maps_section_nr =3D pfn_to_section_nr(page_to_pfn(page)); - removing_section_nr =3D page_private(page); + removing_section_nr =3D page_bootmem_info(page); =20 /* * When this function is called, the removing section is --=20 2.11.0