Re: [linux-next:master 13069/13300] error[E0425]: cannot find value `VM_MERGEABLE` in crate `bindings`

[John Hubbard <jhubbard@nvidia.com>]

On 10/2/25 3:43 PM, Andrew Morton wrote:
> On Fri, 3 Oct 2025 00:39:16 +0200 Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> wrote:
>> On Fri, Oct 3, 2025 at 12:27 AM Andrew Morton <akpm@linux-foundation.org> wrote:
...
> From: Andrew Morton <akpm@linux-foundation.org>
> Subject: mm-ksm-fix-flag-dropping-behavior-in-ksm_madvise-fix
> Date: Thu Oct  2 03:37:47 PM PDT 2025
> 
> Rust bindgen wasn't able to handle the BIT() macro.  Add a helper (from
> Miguel) to fix this.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202510030449.VfSaAjvd-lkp@intel.com/
> Cc: Axel Rasmussen <axelrasmussen@google.com>
> Cc: Chengming Zhou <chengming.zhou@linux.dev>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Jakub Acs <acsjakub@amazon.de>
> Cc: Peter Xu <peterx@redhat.com>
> Cc: SeongJae Park <sj@kernel.org>
> Cc: Xu Xin <xu.xin16@zte.com.cn>
> Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
> Cc: Alice Ryhl <aliceryhl@google.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
> 
>  rust/bindings/bindings_helper.h |    1 +
>  1 file changed, 1 insertion(+)
> 
> --- a/rust/bindings/bindings_helper.h~mm-ksm-fix-flag-dropping-behavior-in-ksm_madvise-fix
> +++ a/rust/bindings/bindings_helper.h
> @@ -99,3 +99,4 @@ const xa_mark_t RUST_CONST_HELPER_XA_PRE
>  
>  const gfp_t RUST_CONST_HELPER_XA_FLAGS_ALLOC = XA_FLAGS_ALLOC;
>  const gfp_t RUST_CONST_HELPER_XA_FLAGS_ALLOC1 = XA_FLAGS_ALLOC1;
> +const vm_flags_t RUST_CONST_HELPER_VM_MERGEABLE = VM_MERGEABLE;
> _

Yes, this fixes the build on my system too, so:

Tested-by: John Hubbard <jhubbard@nvidia.com>

...of course, we'll have to undo this later, as part of the fix
for the Rust for Linux build system, to handle BIT() and similar
macros in bindgen.


thanks,
-- 
John Hubbard