Re: [PATCH] [v2] mm: shmem: avoid build warning for CONFIG_SHMEM=n

[Mike Rapoport <rppt@kernel.org>]

On Thu, Dec 04, 2025 at 11:34:24AM +0100, David Hildenbrand (Red Hat) wrote:
> On 12/4/25 11:28, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> > 
> > The newly added 'flags' variable is unused and causes a warning if
> > CONFIG_SHMEM is disabled, since the shmem_acct_size() macro it is passed
> > into does nothing:
> > 
> > mm/shmem.c: In function '__shmem_file_setup':
> > mm/shmem.c:5816:23: error: unused variable 'flags' [-Werror=unused-variable]
> >   5816 |         unsigned long flags = (vm_flags & VM_NORESERVE) ? SHMEM_F_NORESERVE : 0;
> >        |                       ^~~~~
> > 
> > Replace the two macros with equivalent inline functions tto get the
> > argument checking.
> > 
> > Fixes: 6ff1610ced56 ("mm: shmem: use SHMEM_F_* flags instead of VM_* flags")
> 
> That's still not upstream, right?
> 
> $ git tag --contains 6ff1610ced56
> mm-everything-2025-11-29-19-43
> mm-everything-2025-12-03-23-49
> next-20251201
> next-20251203
> next-20251204
> 
> So we can likely just squash it into the problematic commit before
> proceeding with it?

It's mm-nonmm-stable, I don't think fixups can go there.
 
> Thanks Arnd!
> 
> -- 
> Cheers
> 
> David

-- 
Sincerely yours,
Mike.