On 4/29/21 12:03 AM, Tian Tao wrote: > diff --git a/Documentation/ABI/stable/sysfs-devices-node b/Documentation/ABI/stable/sysfs-devices-node > index 484fc04..82dfe64 100644 > --- a/Documentation/ABI/stable/sysfs-devices-node > +++ b/Documentation/ABI/stable/sysfs-devices-node > @@ -47,7 +47,10 @@ What: /sys/devices/system/node/nodeX/cpulist > Date: October 2002 > Contact: Linux Memory Management list <linux-mm@xxxxxxxxx> > Description: > - The CPUs associated to the node. > + The CPUs associated to the node. The format is like 0-3, > + 8-11, 14,17. maximum size is PAGE_SIZE, so the tail > + of the string will be trimmed while its size is larger > + than PAGE_SIZE. I think it's pretty arguable that truncating output on a real system is an ABI break. Doing this would make the interface rather useless. Don't we need a real solution rather than throwing up our hands? Do we think >PAGE_SIZE data out of a sysfs file is a worse ABI break or something?
