Re: [akpm-mm:mm-new 661/679] mmu.c:undefined reference to `__check_safe_pte_update'

["David Hildenbrand (Arm)" <david@kernel.org>]

On 9/28/26 06:42, Anshuman Khandual wrote:
> On Sun, Sep 27, 2026 at 01:31:00PM -0700, Andrew Morton wrote:
>> On Sun, 27 Sep 2026 00:32:54 +0800 kernel test robot <lkp@intel.com> wrote:
>>
>>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new
>>> head:   b4fc90c82982d98959af08b4320420bcfc01303b
>>> commit: 2862bcaf1aca55e0b43a5692a4595281ab780f05 [661/679] arm64/mm: move __check_safe_pte_update()
>>> config: arm64-randconfig-1002-20260926 (https://download.01.org/0day-ci/archive/20260927/202609270030.Y0QVBPmK-lkp@intel.com/config)
>>> compiler: aarch64-linux-gcc (GCC) 8.5.0
>>
>> Thanks.  It works for me, but I'm using gcc-15.2.0.
> 
> Tried building this series with a cross compiler (gcc 14.3.1) and a native
> compiler (15.2.0). The series builds successfully in both cases.

I'm getting the same problems building mm-next.

The following seems to fix it, which I will carry in for-next and for-test today.


From 448f146f16394713b28295236588ccab3a173827 Mon Sep 17 00:00:00 2001
From: "David Hildenbrand (Arm)" <david@kernel.org>
Date: Mon, 28 Sep 2026 09:42:06 +0200
Subject: [PATCH] fixup: arm64/mm: move __check_safe_pte_update()

Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
---
 arch/arm64/mm/mmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index e589fb00d1e3..7343ac9294f8 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -2392,6 +2392,7 @@ int arch_set_user_pkey_access(int pkey, unsigned long init_val)

 	return 0;
 }
+#endif

 /*
  * PTE bits configuration in the presence of hardware Dirty Bit Management
@@ -2440,4 +2441,3 @@ void __check_safe_pte_update(struct mm_struct *mm, pte_t *ptep, pte_t pte)
 		     __func__, pte_str_old, pte_str);
 }
 #endif /* CONFIG_DEBUG_VM */
-#endif
--
2.55.0

-- 
Cheers,

David