[PATCH V2] mm: Drop unused set_pte_safe()

[Anshuman Khandual <anshuman.khandual@arm.com>]

All set_pte_safe() usage have been dropped after the commit eccd906484d1
("x86/mm: Do not use set_{pud, pmd}_safe() when splitting a large page")
This just drops now unused helper set_pte_safe().

Besides this macro was buggy due to doing direct dereferencing of the pte,
and if it were to be kept, it should have been updated to use a single call
to ptep_get().

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: "Mike Rapoport (IBM)" <rppt@kernel.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
Changes in V2:

- Updated the commit message per Ryan

Changes in V1:

https://lore.kernel.org/all/20240910090409.374424-1-anshuman.khandual@arm.com/

 include/linux/pgtable.h | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 2a6a3cccfc36..aeabbf0db7c8 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1058,12 +1058,6 @@ static inline int pgd_same(pgd_t pgd_a, pgd_t pgd_b)
  * same value. Otherwise, use the typical "set" helpers and flush the
  * TLB.
  */
-#define set_pte_safe(ptep, pte) \
-({ \
-	WARN_ON_ONCE(pte_present(*ptep) && !pte_same(*ptep, pte)); \
-	set_pte(ptep, pte); \
-})
-
 #define set_pmd_safe(pmdp, pmd) \
 ({ \
 	WARN_ON_ONCE(pmd_present(*pmdp) && !pmd_same(*pmdp, pmd)); \
-- 
2.30.2