Re: [akpm-mm:mm-new] BUILD SUCCESS WITH UNVERIFIED WARNING 0c39e2f552f5e16be695cec3a1c77d6a6bf086bb

Andrew Morton <[email protected]> Fri, 31 Jul 2026 10:05:47 -0700

Newsgroups	org.kernel.vger.mm-commits,org.kvack.linux-mm
Message-ID	<[email protected]>

On Fri, 31 Jul 2026 22:31:38 +0800 kernel test robot <[email protected]> wrote:

> tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
> branch HEAD: 0c39e2f552f5e16be695cec3a1c77d6a6bf086bb  mm/swap, PM: hibernate: atomically replace hibernation pin
> 
> Unverified Warning (likely false positive, kindly check if interested):
> 
>     https://lore.kernel.org/oe-kbuild/[email protected]
> 
>     mm/hmm.c:673 hmm_do_fault() error: we previously assumed 'hmm_vma_walk->locked' could be null (see line 654)

Thanks, due to "mm/hmm: add hmm_range_fault_unlocked_timeout() for mmap
lock-drop support".  I think we've looked at this previously.

+	if (hmm_vma_walk->locked)
+		fault_flags |= FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;

...

+			*hmm_vma_walk->locked = false;

Stanislav, can you please take a look?