From b5420237ec817b0b5f729a674c81ace0865c3b3b Mon Sep 17 00:00:00 2001 From: Nikolay Borisov Date: Mon, 11 Mar 2019 23:28:13 -0700 Subject: mm: refactor readahead defines in mm.h All users of VM_MAX_READAHEAD actually convert it to kbytes and then to pages. Define the macro explicitly as (SZ_128K / PAGE_SIZE). This simplifies the expression in every filesystem. Also rename the macro to VM_READAHEAD_PAGES to properly convey its meaning. Finally remove unused VM_MIN_READAHEAD [akpm@linux-foundation.org: fix fs/io_uring.c, per Stephen] Link: http://lkml.kernel.org/r/20181221144053.24318-1-nborisov@suse.com Signed-off-by: Nikolay Borisov Reviewed-by: Matthew Wilcox Reviewed-by: David Hildenbrand Cc: Jens Axboe Cc: Eric Van Hensbergen Cc: Latchesar Ionkov Cc: Dominique Martinet Cc: David Howells Cc: Chris Mason Cc: Josef Bacik Cc: David Sterba Cc: Miklos Szeredi Cc: Stephen Rothwell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mm.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/include/linux/mm.h b/include/linux/mm.h index 5801ee849f36..76769749b5a5 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -26,6 +26,7 @@ #include #include #include +#include struct mempolicy; struct anon_vma; @@ -2402,8 +2403,7 @@ int __must_check write_one_page(struct page *page); void task_dirty_inc(struct task_struct *tsk); /* readahead.c */ -#define VM_MAX_READAHEAD 128 /* kbytes */ -#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ +#define VM_READAHEAD_PAGES (SZ_128K / PAGE_SIZE) int force_page_cache_readahead(struct address_space *mapping, struct file *filp, pgoff_t offset, unsigned long nr_to_read); -- cgit v1.2.3