change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/arch/s390/include/asm/pgalloc.h
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@@ -34,19 +34,21 @@
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 	memset64((u64 *)crst, entry, _CRST_ENTRIES);
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 }
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-static inline unsigned long pgd_entry_type(struct mm_struct *mm)
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-{
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-	if (mm_pmd_folded(mm))
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-		return _SEGMENT_ENTRY_EMPTY;
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-	if (mm_pud_folded(mm))
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-		return _REGION3_ENTRY_EMPTY;
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-	if (mm_p4d_folded(mm))
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-		return _REGION2_ENTRY_EMPTY;
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-	return _REGION1_ENTRY_EMPTY;
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-}
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-
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 int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
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-void crst_table_downgrade(struct mm_struct *);
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+
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+static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
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+					     unsigned long len)
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+{
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+	int rc;
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+
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+	if (addr + len > mm->context.asce_limit &&
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+	    addr + len <= TASK_SIZE) {
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+		rc = crst_table_upgrade(mm, addr + len);
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+		if (rc)
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+			return (unsigned long) rc;
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+	}
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+	return addr;
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+}
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 static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
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 {
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@@ -116,24 +118,11 @@
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 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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 {
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-	unsigned long *table = crst_table_alloc(mm);
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-
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-	if (!table)
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-		return NULL;
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-	if (mm->context.asce_limit == _REGION3_SIZE) {
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-		/* Forking a compat process with 2 page table levels */
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-		if (!pgtable_pmd_page_ctor(virt_to_page(table))) {
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-			crst_table_free(mm, table);
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-			return NULL;
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-		}
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-	}
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-	return (pgd_t *) table;
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+	return (pgd_t *) crst_table_alloc(mm);
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 }
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 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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 {
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-	if (mm->context.asce_limit == _REGION3_SIZE)
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-		pgtable_pmd_page_dtor(virt_to_page(pgd));
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 	crst_table_free(mm, (unsigned long *) pgd);
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 }
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..
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@@ -151,13 +140,11 @@
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 /*
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  * page table entry allocation/free routines.
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  */
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-#define pte_alloc_one_kernel(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
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-#define pte_alloc_one(mm, vmaddr) ((pte_t *) page_table_alloc(mm))
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+#define pte_alloc_one_kernel(mm) ((pte_t *)page_table_alloc(mm))
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+#define pte_alloc_one(mm) ((pte_t *)page_table_alloc(mm))
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 #define pte_free_kernel(mm, pte) page_table_free(mm, (unsigned long *) pte)
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 #define pte_free(mm, pte) page_table_free(mm, (unsigned long *) pte)
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-
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-extern void rcu_table_freelist_finish(void);
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 void vmem_map_init(void);
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 void *vmem_crst_alloc(unsigned long val);