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Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Bcc: Subject: Re: [PATCH v3] x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page_range() Message-ID: <0f94adaf-37a4-4d38-b952-01c2dc474a2c@lucifer.local> Reply-To: In-Reply-To: Actually let me +cc a few more so this isn't lost further :P On Wed, Apr 02, 2025 at 01:32:52PM +0200, David Hildenbrand wrote: > On 02.04.25 13:19, Lorenzo Stoakes wrote: > > On Thu, Mar 27, 2025 at 09:59:02AM +0800, kernel test robot wrote: > > > BCC: lkp@intel.com > > > CC: oe-kbuild-all@lists.linux.dev > > > In-Reply-To: <20250325191951.471185-1-david@redhat.com> > > > References: <20250325191951.471185-1-david@redhat.com> > > > TO: David Hildenbrand > > > > > > Hi David, > > > > > > kernel test robot noticed the following build warnings: > > > > > > [auto build test WARNING on 38fec10eb60d687e30c8c6b5420d86e8149f7557] > > > > > > url: https://github.com/intel-lab-lkp/linux/commits/David-Hildenbrand/x86-mm-pat-Fix-VM_PAT-handling-when-fork-fails-in-copy_page_range/20250326-032200 > > > base: 38fec10eb60d687e30c8c6b5420d86e8149f7557 > > > patch link: https://lore.kernel.org/r/20250325191951.471185-1-david%40redhat.com > > > patch subject: [PATCH v3] x86/mm/pat: Fix VM_PAT handling when fork() fails in copy_page_range() > > > :::::: branch date: 31 hours ago > > > :::::: commit date: 31 hours ago > > > config: hexagon-randconfig-r073-20250327 (https://download.01.org/0day-ci/archive/20250327/202503270941.IFILyNCX-lkp@intel.com/config) > > > compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project c2692afc0a92cd5da140dfcdfff7818a5b8ce997) > > > > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > > > the same patch/commit), kindly add following tags > > > | Reported-by: kernel test robot > > > | Reported-by: Dan Carpenter > > > | Closes: https://lore.kernel.org/r/202503270941.IFILyNCX-lkp@intel.com/ > > > > > > smatch warnings: > > > mm/memory.c:1428 copy_page_range() error: uninitialized symbol 'pfn'. > > Huh, > > how did the original report not make it into my inbox ? :/ Yeah it's odd... maybe broken script? > > Thanks for replying Lorenzo! NP! > > > > > I have a feeling this is because if ndef __HAVE_PFNMAP_TRACKING you just > > don't touch pfn at all, but also I see in the new track_pfn_copy() there > > are code paths where pfn doesn't get set, but you still pass the > > uninitialised pfn to untrack_pfn_copy()... > > If track_pfn_copy() returns 0 and VM_PAT applies, the pfn is set. Otherwise > (returns an error), we immediately return from copy_page_range(). > > So once we reach untrack_pfn_copy() ... the PFN was set. > > In case of !__HAVE_PFNMAP_TRACKING the pfn is not set and not used. > > > > > I mean it could also be in the case of !(src_vma->vm_flags & VM_PAT) (but & > > VM_PFNMAP), where we return 0 but still pass pfn to untrack_pfn_copy()... > > I assume that's what it is complaining about, and it doesn't figure out that > the parameter is unused. > > So likely it's best to just initialize pfn to 0. > > > > > This is all super icky, we probably want to actually have track_pfn_copy() > > indicate whether we want to later untrack, not only if there's an error. > > Sounds overly-complicated. But having a pfn != 0 might work. > > > > Will comment accordingly on patch, but I mean I don't like the idea of > us > > just initialising the pfn here, because... what to?... :) > Sure, I mean for all of above let's have the debate on the main patch I guess so it's in one place... > Stared at that code for too long (and I reached a point where the PAT stuff > absolutely annoys me). But, also lol. Can. Relate. > > Thanks! > > -- > Cheers, > > David / dhildenb > Cheers, Lorenzo