filemap: trivial code cleanups

- remove unused local next_index in do_generic_mapping_read()
- remove a redudant page_cache_read() declaration

Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/filemap.c b/mm/filemap.c
index 3c97bdc..c1b9405 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -869,7 +869,6 @@ void do_generic_mapping_read(struct address_space *mapping,
        unsigned long index;
        unsigned long offset;
        unsigned long last_index;
-       unsigned long next_index;
        unsigned long prev_index;
        unsigned int prev_offset;
        struct page *cached_page;
@@ -877,7 +876,6 @@ void do_generic_mapping_read(struct address_space *mapping,
 
        cached_page = NULL;
        index = *ppos >> PAGE_CACHE_SHIFT;
-       next_index = index;
        prev_index = ra->prev_pos >> PAGE_CACHE_SHIFT;
        prev_offset = ra->prev_pos & (PAGE_CACHE_SIZE-1);
        last_index = (*ppos + desc->count + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
@@ -1250,7 +1248,6 @@ asmlinkage ssize_t sys_readahead(int fd, loff_t offset, size_t count)
 }
 
 #ifdef CONFIG_MMU
-static int FASTCALL(page_cache_read(struct file * file, unsigned long offset));
 /**
  * page_cache_read - adds requested page to the page cache if not already there
  * @file:      file to read