After 4.14 kernel patch [1], it addes SWP_DEVICE_NUM macro and value is 2. After 5.14 kernel patch[2], it incrase this SWP_DEVICE_NUM macro to 4. So we should add this info in here to calculate MAX_SWAPFILES. [1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/include/linux/swap.h?id=5042db43cc [2]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/include/linux/swap.h?id=b756a3b5e Signed-off-by: Yang Xu <xuyang2018.jy@xxxxxxxxxxx> --- man2/swapon.2 | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/man2/swapon.2 b/man2/swapon.2 index b2651fc39..21d6416eb 100644 --- a/man2/swapon.2 +++ b/man2/swapon.2 @@ -177,7 +177,8 @@ Since Linux 2.6.32, the limit is further decreased by 1 if the kernel is built with the .B CONFIG_MEMORY_FAILURE option. -Since Linux 5.14, the limit is further decreased by 4 +Since Linux 4.14, the limit is decreased by 2, +since Linux 5.14, the limit is decreased by 4 if the kernel is built with the .B CONFIG_DEVICE_PRIVATE option. -- 2.27.0
