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mm: remove 'page_offset' from readahead loop

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Replace the page_offset variable with 'index + i'.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Cc: Chao Yu <yuchao0@huawei.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Gao Xiang <gaoxiang25@huawei.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Link: http://lkml.kernel.org/r/20200414150233.24495-10-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-06-01 21:46:36 -07:00 committed by Linus Torvalds
parent c2c7ad74b1
commit ef8153b609
1 changed files with 3 additions and 5 deletions
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8
mm/readahead.c
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@ -180,12 +180,10 @@ void __do_page_cache_readahead(struct address_space *mapping,
* Preallocate as many pages as we will need.
*/
for (i = 0; i < nr_to_read; i++) {
pgoff_t page_offset = index + i;
if (page_offset > end_index)
if (index + i > end_index)
break;
page = xa_load(&mapping->i_pages, page_offset);
page = xa_load(&mapping->i_pages, index + i);
if (page && !xa_is_value(page)) {
/*
* Page already present? Kick off the current batch of
@ -199,7 +197,7 @@ void __do_page_cache_readahead(struct address_space *mapping,
page = __page_cache_alloc(gfp_mask);
if (!page)
break;
page->index = page_offset;
page->index = index + i;
list_add(&page->lru, &page_pool);
if (i == nr_to_read - lookahead_size)
SetPageReadahead(page);