mm/Kconfig: add MMU dependency for MIGRATION.

[linux.git] / mm / readahead.c

diff --git a/mm/readahead.c b/mm/readahead.c
index 829a77c628348a78b9efc130689d549368a57567..e4ed04149785f069b201cd2ffaa9caa90c4b0d22 100644 (file)
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -371,10 +371,10 @@ static int try_context_readahead(struct address_space *mapping,
        size = count_history_pages(mapping, ra, offset, max);
 
        /*
-        * no history pages:
+        * not enough history pages:
         * it could be a random read
         */
-       if (!size)
+       if (size <= req_size)
                return 0;
 
        /*
@@ -385,8 +385,8 @@ static int try_context_readahead(struct address_space *mapping,
                size *= 2;
 
        ra->start = offset;
-       ra->size = get_init_ra_size(size + req_size, max);
-       ra->async_size = ra->size;
+       ra->size = min(size + req_size, max);
+       ra->async_size = 1;
 
        return 1;
 }