[PATCH -next] net/ipv4/tcp.c: remove superfluous header file in tcp.c

From: Mianhan Liu
Date: Wed Aug 11 2021 - 09:49:32 EST


nr_free_buffer_pages could be exposed through mm.h instead of swap.h,
and then tcp.c wouldn't need swap.h. Moreover, after preprocessing
all the files that use nr_free_buffer_pages, it turns out that those files
have already included mm.h.
Thus, we can move nr_free_buffer_pages from swap.h to mm.h safely
so as to reduce the obsolete includes.

Signed-off-by: MianHan Liu <liumh1@xxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 1 +
include/linux/swap.h | 2 +-
net/ipv4/tcp.c | 1 -
3 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ce8fc0fd6..6ca7b7fba 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -871,6 +871,7 @@ void put_pages_list(struct list_head *pages);
void split_page(struct page *page, unsigned int order);
void folio_copy(struct folio *dst, struct folio *src);

+extern unsigned long nr_free_buffer_pages(void);
/*
* Compound pages have a destructor function. Provide a
* prototype for that function and accessor functions.
diff --git a/include/linux/swap.h b/include/linux/swap.h
index cdf0957a8..22b17431a 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -341,7 +341,7 @@ void workingset_update_node(struct xa_node *node);

/* linux/mm/page_alloc.c */
extern unsigned long totalreserve_pages;
-extern unsigned long nr_free_buffer_pages(void);
+

/* Definition of global_zone_page_state not available yet */
#define nr_free_pages() global_zone_page_state(NR_FREE_PAGES)
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index f931def63..dcdd8ebfb 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -260,7 +260,6 @@
#include <linux/random.h>
#include <linux/memblock.h>
#include <linux/highmem.h>
-#include <linux/swap.h>
#include <linux/cache.h>
#include <linux/err.h>
#include <linux/time.h>
--
2.25.1