Commit 20ff1c95 authored by Gao Xiang's avatar Gao Xiang Committed by Linus Torvalds

mm/readahead.c: simplify get_next_ra_size()

It's a trivial simplification for get_next_ra_size() and clear enough for
humans to understand.

It also fixes potential overflow if ra->size(< ra_pages) is too large.

Link: http://lkml.kernel.org/r/1540707206-19649-1-git-send-email-hsiangkao@aol.comSigned-off-by: default avatarGao Xiang <hsiangkao@aol.com>
Reviewed-by: default avatarFengguang Wu <fengguang.wu@intel.com>
Reviewed-by: default avatarMatthew Wilcox <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 368686a9
...@@ -273,14 +273,12 @@ static unsigned long get_next_ra_size(struct file_ra_state *ra, ...@@ -273,14 +273,12 @@ static unsigned long get_next_ra_size(struct file_ra_state *ra,
unsigned long max) unsigned long max)
{ {
unsigned long cur = ra->size; unsigned long cur = ra->size;
unsigned long newsize;
if (cur < max / 16) if (cur < max / 16)
newsize = 4 * cur; return 4 * cur;
else if (cur <= max / 2)
newsize = 2 * cur; return 2 * cur;
return max;
return min(newsize, max);
} }
/* /*
......
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