On Wed, Feb 28, 2018 at 12:53:40PM -0500, Waiman Long wrote: > On 02/27/2018 07:47 PM, Luis R. Rodriguez wrote: > > On Tue, Feb 27, 2018 at 03:49:48PM -0500, Waiman Long wrote: > >> When minimum/maximum values are specified for a sysctl parameter in > >> the ctl_table structure with proc_dointvec_minmax() handler, > > an > > > >> update > >> to that parameter will fail with error if the given value is outside > >> of the required range. > >> > >> There are use cases where it may be better to clamp the value of > >> the sysctl parameter to the given range without failing the update, > >> especially if the users are not aware of the actual range limits. > > Makes me wonder if we should add something which does let one query > > for the ranges. Then scripts can fetch that as well. > > That will actually be better than printing out the range in the dmesg > log. However, I haven't figured out an easy way of doing that. If you > have any suggestion, please let me know about it. I think a macro that also adds yet another proc read-only entry with a postfix "_range" with an internal handler which prints the range may suffice. Luis
