Re: [PATCH v3 2/3] mm: rmap: Fix CONT-PTE/PMD size hugetlb issue when migration

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On 5/11/2022 7:28 AM, Andrew Morton wrote:
On Tue, 10 May 2022 16:17:39 -0700 Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

+
+static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
+					  unsigned long addr, pte_t *ptep)
+{
+	return ptep_get(ptep);
+}
+
+static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+				   pte_t *ptep, pte_t pte)
+{
+}
  #endif	/* CONFIG_HUGETLB_PAGE */

This blows up nommu (arm allnoconfig):

In file included from fs/io_uring.c:71:
./include/linux/hugetlb.h: In function 'huge_ptep_clear_flush':
./include/linux/hugetlb.h:1100:16: error: implicit declaration of function 'ptep_get' [-Werror=implicit-function-declaration]
  1100 |         return ptep_get(ptep);
       |                ^~~~~~~~


huge_ptep_clear_flush() is only used in CONFIG_NOMMU=n files, so I simply
zapped this change.


Well that wasn't a great success.  Doing this instead.  It's pretty
nasty - something nicer would be nicer please.

Thanks for fixing the building issue. I'll look at this to simplify the dummy function. Myabe just remove the ptep_get().

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -1097,7 +1097,7 @@ static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr
 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
                                          unsigned long addr, pte_t *ptep)
 {
-       return ptep_get(ptep);
+       return *ptep;
 }


--- a/include/linux/hugetlb.h~mm-rmap-fix-cont-pte-pmd-size-hugetlb-issue-when-migration-fix
+++ a/include/linux/hugetlb.h
@@ -1094,6 +1094,7 @@ static inline void set_huge_swap_pte_at(
  {
  }
+#ifdef CONFIG_MMU
  static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
  					  unsigned long addr, pte_t *ptep)
  {
@@ -1104,6 +1105,7 @@ static inline void set_huge_pte_at(struc
  				   pte_t *ptep, pte_t pte)
  {
  }
+#endif
  #endif	/* CONFIG_HUGETLB_PAGE */
static inline spinlock_t *huge_pte_lock(struct hstate *h,
_



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