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Message-ID: <163969850279.20885.7172996032577523902.stgit@noble.brown>
Date: Fri, 17 Dec 2021 10:48:22 +1100
From: NeilBrown <neilb@...e.de>
To: Trond Myklebust <trond.myklebust@...merspace.com>,
Anna Schumaker <anna.schumaker@...app.com>,
Chuck Lever <chuck.lever@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mgorman@...e.de>,
Christoph Hellwig <hch@...radead.org>,
David Howells <dhowells@...hat.com>
Cc: linux-nfs@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 02/18] MM: create new mm/swap.h header file.
Many functions declared in include/linux/swap.h are only used within mm/
Create a new "mm/swap.h" and move some of these declarations there.
Remove the redundant 'extern' from the function declarations.
Signed-off-by: NeilBrown <neilb@...e.de>
---
include/linux/swap.h | 121 -----------------------------------------------
mm/madvise.c | 1
mm/memory.c | 1
mm/mincore.c | 1
mm/page_alloc.c | 1
mm/page_io.c | 1
mm/shmem.c | 1
mm/swap.h | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++
mm/swap_state.c | 1
mm/swapfile.c | 1
mm/util.c | 1
mm/vmscan.c | 1
12 files changed, 139 insertions(+), 121 deletions(-)
create mode 100644 mm/swap.h
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 10b2a92c1aa1..6a0c25c0bb95 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -419,61 +419,18 @@ extern void kswapd_stop(int nid);
#ifdef CONFIG_SWAP
-#include <linux/blk_types.h> /* for bio_end_io_t */
-
-/* linux/mm/page_io.c */
-extern int swap_readpage(struct page *page, bool do_poll);
-extern int swap_writepage(struct page *page, struct writeback_control *wbc);
-extern void end_swap_bio_write(struct bio *bio);
-extern int __swap_writepage(struct page *page, struct writeback_control *wbc,
- bio_end_io_t end_write_func);
-
int add_swap_extent(struct swap_info_struct *sis, unsigned long start_page,
unsigned long nr_pages, sector_t start_block);
int generic_swapfile_activate(struct swap_info_struct *, struct file *,
sector_t *);
-/* linux/mm/swap_state.c */
-/* One swap address space for each 64M swap space */
-#define SWAP_ADDRESS_SPACE_SHIFT 14
-#define SWAP_ADDRESS_SPACE_PAGES (1 << SWAP_ADDRESS_SPACE_SHIFT)
-extern struct address_space *swapper_spaces[];
-#define swap_address_space(entry) \
- (&swapper_spaces[swp_type(entry)][swp_offset(entry) \
- >> SWAP_ADDRESS_SPACE_SHIFT])
static inline unsigned long total_swapcache_pages(void)
{
return global_node_page_state(NR_SWAPCACHE);
}
-extern void show_swap_cache_info(void);
-extern int add_to_swap(struct page *page);
-extern void *get_shadow_from_swap_cache(swp_entry_t entry);
-extern int add_to_swap_cache(struct page *page, swp_entry_t entry,
- gfp_t gfp, void **shadowp);
-extern void __delete_from_swap_cache(struct page *page,
- swp_entry_t entry, void *shadow);
-extern void delete_from_swap_cache(struct page *);
-extern void clear_shadow_from_swap_cache(int type, unsigned long begin,
- unsigned long end);
-extern void free_swap_cache(struct page *);
extern void free_page_and_swap_cache(struct page *);
extern void free_pages_and_swap_cache(struct page **, int);
-extern struct page *lookup_swap_cache(swp_entry_t entry,
- struct vm_area_struct *vma,
- unsigned long addr);
-struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index);
-extern struct page *read_swap_cache_async(swp_entry_t, gfp_t,
- struct vm_area_struct *vma, unsigned long addr,
- bool do_poll);
-extern struct page *__read_swap_cache_async(swp_entry_t, gfp_t,
- struct vm_area_struct *vma, unsigned long addr,
- bool *new_page_allocated);
-extern struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
- struct vm_fault *vmf);
-extern struct page *swapin_readahead(swp_entry_t entry, gfp_t flag,
- struct vm_fault *vmf);
-
/* linux/mm/swapfile.c */
extern atomic_long_t nr_swap_pages;
extern long total_swap_pages;
@@ -527,12 +484,6 @@ static inline void put_swap_device(struct swap_info_struct *si)
}
#else /* CONFIG_SWAP */
-
-static inline int swap_readpage(struct page *page, bool do_poll)
-{
- return 0;
-}
-
static inline struct swap_info_struct *swp_swap_info(swp_entry_t entry)
{
return NULL;
@@ -547,11 +498,6 @@ static inline void put_swap_device(struct swap_info_struct *si)
{
}
-static inline struct address_space *swap_address_space(swp_entry_t entry)
-{
- return NULL;
-}
-
#define get_nr_swap_pages() 0L
#define total_swap_pages 0L
#define total_swapcache_pages() 0UL
@@ -566,14 +512,6 @@ static inline struct address_space *swap_address_space(swp_entry_t entry)
#define free_pages_and_swap_cache(pages, nr) \
release_pages((pages), (nr));
-static inline void free_swap_cache(struct page *page)
-{
-}
-
-static inline void show_swap_cache_info(void)
-{
-}
-
/* used to sanity check ptes in zap_pte_range when CONFIG_SWAP=0 */
#define free_swap_and_cache(e) is_pfn_swap_entry(e)
@@ -599,65 +537,6 @@ static inline void put_swap_page(struct page *page, swp_entry_t swp)
{
}
-static inline struct page *swap_cluster_readahead(swp_entry_t entry,
- gfp_t gfp_mask, struct vm_fault *vmf)
-{
- return NULL;
-}
-
-static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
- struct vm_fault *vmf)
-{
- return NULL;
-}
-
-static inline int swap_writepage(struct page *p, struct writeback_control *wbc)
-{
- return 0;
-}
-
-static inline struct page *lookup_swap_cache(swp_entry_t swp,
- struct vm_area_struct *vma,
- unsigned long addr)
-{
- return NULL;
-}
-
-static inline
-struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index)
-{
- return find_get_page(mapping, index);
-}
-
-static inline int add_to_swap(struct page *page)
-{
- return 0;
-}
-
-static inline void *get_shadow_from_swap_cache(swp_entry_t entry)
-{
- return NULL;
-}
-
-static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
- gfp_t gfp_mask, void **shadowp)
-{
- return -1;
-}
-
-static inline void __delete_from_swap_cache(struct page *page,
- swp_entry_t entry, void *shadow)
-{
-}
-
-static inline void delete_from_swap_cache(struct page *page)
-{
-}
-
-static inline void clear_shadow_from_swap_cache(int type, unsigned long begin,
- unsigned long end)
-{
-}
static inline int page_swapcount(struct page *page)
{
diff --git a/mm/madvise.c b/mm/madvise.c
index 8c927202bbe6..724470773582 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -33,6 +33,7 @@
#include <asm/tlb.h>
#include "internal.h"
+#include "swap.h"
struct madvise_walk_private {
struct mmu_gather *tlb;
diff --git a/mm/memory.c b/mm/memory.c
index 8f1de811a1dc..80bbfd449b40 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -85,6 +85,7 @@
#include "pgalloc-track.h"
#include "internal.h"
+#include "swap.h"
#if defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS) && !defined(CONFIG_COMPILE_TEST)
#warning Unfortunate NUMA and NUMA Balancing config, growing page-frame for last_cpupid.
diff --git a/mm/mincore.c b/mm/mincore.c
index 9122676b54d6..f4f627325e12 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -20,6 +20,7 @@
#include <linux/pgtable.h>
#include <linux/uaccess.h>
+#include "swap.h"
static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr,
unsigned long end, struct mm_walk *walk)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c5952749ad40..c0b7a3878801 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -78,6 +78,7 @@
#include "internal.h"
#include "shuffle.h"
#include "page_reporting.h"
+#include "swap.h"
/* Free Page Internal flags: for internal, non-pcp variants of free_pages(). */
typedef int __bitwise fpi_t;
diff --git a/mm/page_io.c b/mm/page_io.c
index cb617a4f59df..a9fe5de5dc32 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -25,6 +25,7 @@
#include <linux/psi.h>
#include <linux/uio.h>
#include <linux/sched/task.h>
+#include "swap.h"
void end_swap_bio_write(struct bio *bio)
{
diff --git a/mm/shmem.c b/mm/shmem.c
index 18f93c2d68f1..993b6b3ca20f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -39,6 +39,7 @@
#include <linux/frontswap.h>
#include <linux/fs_parser.h>
#include <linux/swapfile.h>
+#include "swap.h"
static struct vfsmount *shm_mnt;
diff --git a/mm/swap.h b/mm/swap.h
new file mode 100644
index 000000000000..13e72a5023aa
--- /dev/null
+++ b/mm/swap.h
@@ -0,0 +1,129 @@
+
+#ifdef CONFIG_SWAP
+#include <linux/blk_types.h> /* for bio_end_io_t */
+
+/* linux/mm/page_io.c */
+int swap_readpage(struct page *page, bool do_poll);
+int swap_writepage(struct page *page, struct writeback_control *wbc);
+void end_swap_bio_write(struct bio *bio);
+int __swap_writepage(struct page *page, struct writeback_control *wbc,
+ bio_end_io_t end_write_func);
+
+/* linux/mm/swap_state.c */
+/* One swap address space for each 64M swap space */
+#define SWAP_ADDRESS_SPACE_SHIFT 14
+#define SWAP_ADDRESS_SPACE_PAGES (1 << SWAP_ADDRESS_SPACE_SHIFT)
+extern struct address_space *swapper_spaces[];
+#define swap_address_space(entry) \
+ (&swapper_spaces[swp_type(entry)][swp_offset(entry) \
+ >> SWAP_ADDRESS_SPACE_SHIFT])
+
+void show_swap_cache_info(void);
+int add_to_swap(struct page *page);
+void *get_shadow_from_swap_cache(swp_entry_t entry);
+int add_to_swap_cache(struct page *page, swp_entry_t entry,
+ gfp_t gfp, void **shadowp);
+void __delete_from_swap_cache(struct page *page,
+ swp_entry_t entry, void *shadow);
+void delete_from_swap_cache(struct page *);
+void clear_shadow_from_swap_cache(int type, unsigned long begin,
+ unsigned long end);
+void free_swap_cache(struct page *);
+struct page *lookup_swap_cache(swp_entry_t entry,
+ struct vm_area_struct *vma,
+ unsigned long addr);
+struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index);
+
+struct page *read_swap_cache_async(swp_entry_t, gfp_t,
+ struct vm_area_struct *vma,
+ unsigned long addr,
+ bool do_poll);
+struct page *__read_swap_cache_async(swp_entry_t, gfp_t,
+ struct vm_area_struct *vma,
+ unsigned long addr,
+ bool *new_page_allocated);
+struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
+ struct vm_fault *vmf);
+struct page *swapin_readahead(swp_entry_t entry, gfp_t flag,
+ struct vm_fault *vmf);
+
+#else /* CONFIG_SWAP */
+static inline int swap_readpage(struct page *page, bool do_poll)
+{
+ return 0;
+}
+
+static inline struct address_space *swap_address_space(swp_entry_t entry)
+{
+ return NULL;
+}
+
+static inline void free_swap_cache(struct page *page)
+{
+}
+
+static inline void show_swap_cache_info(void)
+{
+}
+
+static inline struct page *swap_cluster_readahead(swp_entry_t entry,
+ gfp_t gfp_mask, struct vm_fault *vmf)
+{
+ return NULL;
+}
+
+static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
+ struct vm_fault *vmf)
+{
+ return NULL;
+}
+
+static inline int swap_writepage(struct page *p, struct writeback_control *wbc)
+{
+ return 0;
+}
+
+static inline struct page *lookup_swap_cache(swp_entry_t swp,
+ struct vm_area_struct *vma,
+ unsigned long addr)
+{
+ return NULL;
+}
+
+static inline
+struct page *find_get_incore_page(struct address_space *mapping, pgoff_t index)
+{
+ return find_get_page(mapping, index);
+}
+
+static inline int add_to_swap(struct page *page)
+{
+ return 0;
+}
+
+static inline void *get_shadow_from_swap_cache(swp_entry_t entry)
+{
+ return NULL;
+}
+
+static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
+ gfp_t gfp_mask, void **shadowp)
+{
+ return -1;
+}
+
+static inline void __delete_from_swap_cache(struct page *page,
+ swp_entry_t entry, void *shadow)
+{
+}
+
+static inline void delete_from_swap_cache(struct page *page)
+{
+}
+
+static inline void clear_shadow_from_swap_cache(int type, unsigned long begin,
+ unsigned long end)
+{
+}
+
+#endif /* CONFIG_SWAP */
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 616eb1d75b35..514b86b05488 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -23,6 +23,7 @@
#include <linux/huge_mm.h>
#include <linux/shmem_fs.h>
#include "internal.h"
+#include "swap.h"
/*
* swapper_space is a fiction, retained to simplify the path through
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 419eacf474c5..f23d9ff21cf8 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -44,6 +44,7 @@
#include <asm/tlbflush.h>
#include <linux/swapops.h>
#include <linux/swap_cgroup.h>
+#include "swap.h"
static bool swap_count_continued(struct swap_info_struct *, pgoff_t,
unsigned char);
diff --git a/mm/util.c b/mm/util.c
index 741ba32a43ac..7e26387be090 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -27,6 +27,7 @@
#include <linux/uaccess.h>
#include "internal.h"
+#include "swap.h"
/**
* kfree_const - conditionally free memory
diff --git a/mm/vmscan.c b/mm/vmscan.c
index fb9584641ac7..969bcdb4ca80 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -58,6 +58,7 @@
#include <linux/balloon_compaction.h>
#include "internal.h"
+#include "swap.h"
#define CREATE_TRACE_POINTS
#include <trace/events/vmscan.h>
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