diff options
Diffstat (limited to 'mm/readahead.c')
| -rw-r--r-- | mm/readahead.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/mm/readahead.c b/mm/readahead.c index 3dc6c7a128dd..475d2940a1ed 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -206,9 +206,9 @@ void page_cache_ra_unbounded(struct readahead_control *ractl, unsigned long nr_to_read, unsigned long lookahead_size) { struct address_space *mapping = ractl->mapping; - unsigned long ra_folio_index, index = readahead_index(ractl); + unsigned long index = readahead_index(ractl); gfp_t gfp_mask = readahead_gfp_mask(mapping); - unsigned long mark, i = 0; + unsigned long mark = ULONG_MAX, i = 0; unsigned int min_nrpages = mapping_min_folio_nrpages(mapping); /* @@ -232,9 +232,14 @@ void page_cache_ra_unbounded(struct readahead_control *ractl, * index that only has lookahead or "async_region" to set the * readahead flag. */ - ra_folio_index = round_up(readahead_index(ractl) + nr_to_read - lookahead_size, - min_nrpages); - mark = ra_folio_index - index; + if (lookahead_size <= nr_to_read) { + unsigned long ra_folio_index; + + ra_folio_index = round_up(readahead_index(ractl) + + nr_to_read - lookahead_size, + min_nrpages); + mark = ra_folio_index - index; + } nr_to_read += readahead_index(ractl) - index; ractl->_index = index; |