On Mon, Sep 08, 2025 at 10:24:47AM -0300, Jason Gunthorpe wrote: > On Mon, Sep 08, 2025 at 12:10:43PM +0100, Lorenzo Stoakes wrote: > > resctl uses remap_pfn_range(), but holds a mutex over the > > operation. Therefore, establish the mutex in mmap_prepare(), release it in > > mmap_complete() and release it in mmap_abort() should the operation fail. > > The mutex can't do anything relative to remap_pfn, no reason to hold it. Sorry I missed this bit before... Yeah I guess my concern was that the original code very intentionally holds the mutex _over the remap operation_. But I guess given we release the lock on failure this isn't necessary, and of course obviously the lock has no bearing ont he actual remap. Will drop it and drop mmap_abort for now as it's not yet needed. Cheers, Lorenzo
