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

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 3 Oct 2025 04:52:48 +0800 kernel test robot <lkp@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   7396732143a22b42bb97710173d598aaf50daa89
> commit: 8355c2312fdfe590a296b8abf9414ab7ecb49d1d [13069/13300] mm/ksm: fix flag-dropping behavior in ksm_madvise
> config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20251003/202510030449.VfSaAjvd-lkp@intel.com/config)
> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251003/202510030449.VfSaAjvd-lkp@intel.com/reproduce)
> 
> 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 <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202510030449.VfSaAjvd-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> >> error[E0425]: cannot find value `VM_MERGEABLE` in crate `bindings`
>    --> rust/kernel/mm/virt.rs:471:49
>    |
>    471  |     pub const MERGEABLE: vm_flags_t = bindings::VM_MERGEABLE as vm_flags_t;
>    |                                                 ^^^^^^^^^^^^ help: a constant with a similar name exists: `MMF_VM_MERGEABLE`
>    |
>    ::: rust/bindings/bindings_generated.rs:7936:1
>    |
>    7936 | pub const MMF_VM_MERGEABLE: u32 = 16;
>    | ------------------------------- similarly named constant `MMF_VM_MERGEABLE` defined here

No idea.  Let me cc rust-for-linux.

It's a one-line patch:

--- a/include/linux/mm.h~mm-ksm-fix-flag-dropping-behavior-in-ksm_madvise
+++ a/include/linux/mm.h
@@ -296,7 +296,7 @@ extern unsigned int kobjsize(const void
 #define VM_MIXEDMAP	0x10000000	/* Can contain "struct page" and pure PFN pages */
 #define VM_HUGEPAGE	0x20000000	/* MADV_HUGEPAGE marked this vma */
 #define VM_NOHUGEPAGE	0x40000000	/* MADV_NOHUGEPAGE marked this vma */
-#define VM_MERGEABLE	0x80000000	/* KSM may merge identical pages */
+#define VM_MERGEABLE	BIT(31)		/* KSM may merge identical pages */
 
 #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
 #define VM_HIGH_ARCH_BIT_0	32	/* bit only usable on 64-bit architectures */
_