On Tue, 2024-05-21 at 22:44 +0100, David Howells wrote: > Jarkko Sakkinen <jarkko@xxxxxxxxxx> wrote: > > > On Tue May 21, 2024 at 9:18 PM EEST, James Bottomley wrote: > > ... > > You don't save a single byte of memory with any constant that > > dictates the size requirements for multiple modules in two disjoint > > subsystems. > > I think James is just suggesting you replace your limit argument with > a constant not that you always allocate that amount of memory. Exactly. All we use it for is the -E2BIG check to ensure user space isn't allowed to run away with loads of kernel memory. > What the limit should be, OTOH, is up for discussion, but PAGE_SIZE > seems not unreasonable. A page is fine currently (MAX_BLOB_SIZE is 512). However, it may be too small for some of the complex policies when they're introduced. I'm not bothered about what it currently is, I just want it to be able to be increased easily when the time comes. James
