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mm/readahead.c: simplify get_next_ra_size()

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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.com
Signed-off-by: Gao Xiang <hsiangkao@aol.com>
Reviewed-by: Fengguang Wu <fengguang.wu@intel.com>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gao Xiang 2018-12-28 00:33:34 -08:00 committed by Linus Torvalds
parent 368686a95e
commit 20ff1c9505
1 changed files with 5 additions and 7 deletions
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12
mm/readahead.c
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@ -270,17 +270,15 @@ static unsigned long get_init_ra_size(unsigned long size, unsigned long max)
* return it as the new window size.
*/
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 newsize;
if (cur < max / 16)
newsize = 4 * cur;
else
newsize = 2 * cur;
return min(newsize, max);
return 4 * cur;
if (cur <= max / 2)
return 2 * cur;
return max;
}
/*