From ea0ffd0c08d0fef1f6e93eb07badbeeabf6b43d6 Mon Sep 17 00:00:00 2001 From: Kairui Song Date: Mon, 24 Oct 2022 00:25:33 +0800 Subject: swap: add a limit for readahead page-cluster value Currenty there is no upper limit for /proc/sys/vm/page-cluster, and it's a bit shift value, so it could result in overflow of the 32-bit integer. Add a reasonable upper limit for it, read-in at most 2**31 pages, which is a large enough value for readahead. Link: https://lkml.kernel.org/r/20221023162533.81561-1-ryncsn@gmail.com Signed-off-by: Kairui Song Signed-off-by: Andrew Morton --- mm/swap.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'mm/swap.c') diff --git a/mm/swap.c b/mm/swap.c index 2f12a2ee1d3a..b9a6817e07ff 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -43,8 +43,9 @@ #define CREATE_TRACE_POINTS #include -/* How many pages do we try to swap or page in/out together? */ +/* How many pages do we try to swap or page in/out together? As a power of 2 */ int page_cluster; +const int page_cluster_max = 31; /* Protecting only lru_rotate.fbatch which requires disabling interrupts */ struct lru_rotate { -- cgit