mm: fix madvise WILLNEED performance problem

The calculation of the end page index was incorrect, leading to a
regression of 70% when running stress-ng.

With this fix, we instead see a performance improvement of 3%.

Fixes: e6e88712e43b ("mm: optimise madvise WILLNEED")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Tested-by: Xing Zhengjun <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: William Kucharski <[email protected]>
Cc: Feng Tang <[email protected]>
Cc: "Chen, Rong A" <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions