[PATCH] powerpc/mm: remove radix-specific vmemmap PMD overrides

[PATCH] powerpc/mm: remove radix-specific vmemmap PMD overrides

[Muchun Song]

PowerPC radix vmemmap population has private implementations of
vmemmap_set_pmd() and vmemmap_check_pmd() that duplicate the generic
helpers in mm/sparse-vmemmap.c.

Remove the radix-specific overrides so the common helpers are used
instead. Since commit 4edd70ee6a7d ("mm/sparse-vmemmap:
flush_cache_vmap() after hotplugging vmemmap"), the generic sparse
vmemmap code calls flush_cache_vmap() after vmemmap population. On
PowerPC, that provides the necessary ptesync.

Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
 arch/powerpc/mm/book3s64/radix_pgtable.c | 26 ------------------------
 1 file changed, 26 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index cf692b2b5f7b..08ab371e4722 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -987,31 +987,6 @@ bool vmemmap_can_optimize(struct vmem_altmap *altmap, struct dev_pagemap *pgmap)
 }
 #endif
 
-int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node,
-				unsigned long addr, unsigned long next)
-{
-	int large = pmd_leaf(*pmdp);
-
-	if (large)
-		vmemmap_verify(pmdp_ptep(pmdp), node, addr, next);
-
-	return large;
-}
-
-void __meminit vmemmap_set_pmd(pmd_t *pmdp, void *p, int node,
-			       unsigned long addr, unsigned long next)
-{
-	pte_t entry;
-	pte_t *ptep = pmdp_ptep(pmdp);
-
-	VM_BUG_ON(!IS_ALIGNED(addr, PMD_SIZE));
-	entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);
-	set_pte_at(&init_mm, addr, ptep, entry);
-	asm volatile("ptesync": : :"memory");
-
-	vmemmap_verify(ptep, node, addr, next);
-}
-
 static pte_t * __meminit radix__vmemmap_pte_populate(pmd_t *pmdp, unsigned long addr,
 						     int node,
 						     struct vmem_altmap *altmap,
@@ -1055,7 +1030,6 @@ static pte_t * __meminit radix__vmemmap_pte_populate(pmd_t *pmdp, unsigned long
 		VM_BUG_ON(!PAGE_ALIGNED(addr));
 		entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);
 		set_pte_at(&init_mm, addr, pte, entry);
-		asm volatile("ptesync": : :"memory");
 	}
 	return pte;
 }

base-commit: 9a4cdc958dd79fc6c3b20b51a10debec6ca09fec
-- 
2.54.0