powerpc/mm: Remove empty hash__ functions

The empty hash__* functions are unnecessary. The empty definitions were
introduced when 64-bit Hash support was added, as the functions were
still used in generic code. These empty definitions were prefixed with
hash__ when Radix support was added, and new wrappers with the original
names were added that selected the Radix or Hash version based on
radix_enabled().

But the hash__ prefixed functions were not part of a public interface,
so there is no need to include them for compatibility with anything.
Generic code will use the non-prefixed wrappers, and Hash specific code
will know that there is no point in calling them (or even worse, call
them and expect them to do something).
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221109045112.187069-5-bgray@linux.ibm.com

arch/powerpc/include/asm/book3s/64/tlbflush-hash.h

@@ -65,13 +65,6 @@ extern void flush_hash_range(unsigned long number, int local);
 extern void flush_hash_hugepage(unsigned long vsid, unsigned long addr,
 				pmd_t *pmdp, unsigned int psize, int ssize,
 				unsigned long flags);
-static inline void hash__local_flush_tlb_mm(struct mm_struct *mm)
-{
-}
-
-static inline void hash__flush_tlb_mm(struct mm_struct *mm)
-{
-}
 
 static inline void hash__local_flush_all_mm(struct mm_struct *mm)
 {
@@ -95,27 +88,6 @@ static inline void hash__flush_all_mm(struct mm_struct *mm)
 	WARN_ON_ONCE(1);
 }
 
-static inline void hash__local_flush_tlb_page(struct vm_area_struct *vma,
-					  unsigned long vmaddr)
-{
-}
-
-static inline void hash__flush_tlb_page(struct vm_area_struct *vma,
-				    unsigned long vmaddr)
-{
-}
-
-static inline void hash__flush_tlb_range(struct vm_area_struct *vma,
-				     unsigned long start, unsigned long end)
-{
-}
-
-static inline void hash__flush_tlb_kernel_range(unsigned long start,
-					    unsigned long end)
-{
-}
-
-
 struct mmu_gather;
 extern void hash__tlb_flush(struct mmu_gather *tlb);
 

arch/powerpc/include/asm/book3s/64/tlbflush.h

@@ -47,8 +47,7 @@ static inline void flush_pmd_tlb_range(struct vm_area_struct *vma,
 				       unsigned long start, unsigned long end)
 {
 	if (radix_enabled())
-		return radix__flush_pmd_tlb_range(vma, start, end);
-	return hash__flush_tlb_range(vma, start, end);
+		radix__flush_pmd_tlb_range(vma, start, end);
 }
 
 #define __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE
@@ -57,39 +56,34 @@ static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma,
 					   unsigned long end)
 {
 	if (radix_enabled())
-		return radix__flush_hugetlb_tlb_range(vma, start, end);
-	return hash__flush_tlb_range(vma, start, end);
+		radix__flush_hugetlb_tlb_range(vma, start, end);
 }
 
 static inline void flush_tlb_range(struct vm_area_struct *vma,
 				   unsigned long start, unsigned long end)
 {
 	if (radix_enabled())
-		return radix__flush_tlb_range(vma, start, end);
-	return hash__flush_tlb_range(vma, start, end);
+		radix__flush_tlb_range(vma, start, end);
 }
 
 static inline void flush_tlb_kernel_range(unsigned long start,
 					  unsigned long end)
 {
 	if (radix_enabled())
-		return radix__flush_tlb_kernel_range(start, end);
-	return hash__flush_tlb_kernel_range(start, end);
+		radix__flush_tlb_kernel_range(start, end);
 }
 
 static inline void local_flush_tlb_mm(struct mm_struct *mm)
 {
 	if (radix_enabled())
-		return radix__local_flush_tlb_mm(mm);
-	return hash__local_flush_tlb_mm(mm);
+		radix__local_flush_tlb_mm(mm);
 }
 
 static inline void local_flush_tlb_page(struct vm_area_struct *vma,
 					unsigned long vmaddr)
 {
 	if (radix_enabled())
-		return radix__local_flush_tlb_page(vma, vmaddr);
-	return hash__local_flush_tlb_page(vma, vmaddr);
+		radix__local_flush_tlb_page(vma, vmaddr);
 }
 
 static inline void local_flush_all_mm(struct mm_struct *mm)
@@ -102,24 +96,21 @@ static inline void local_flush_all_mm(struct mm_struct *mm)
 static inline void tlb_flush(struct mmu_gather *tlb)
 {
 	if (radix_enabled())
-		return radix__tlb_flush(tlb);
-	return hash__tlb_flush(tlb);
+		radix__tlb_flush(tlb);
 }
 
 #ifdef CONFIG_SMP
 static inline void flush_tlb_mm(struct mm_struct *mm)
 {
 	if (radix_enabled())
-		return radix__flush_tlb_mm(mm);
-	return hash__flush_tlb_mm(mm);
+		radix__flush_tlb_mm(mm);
 }
 
 static inline void flush_tlb_page(struct vm_area_struct *vma,
 				  unsigned long vmaddr)
 {
 	if (radix_enabled())
-		return radix__flush_tlb_page(vma, vmaddr);
-	return hash__flush_tlb_page(vma, vmaddr);
+		radix__flush_tlb_page(vma, vmaddr);
 }
 
 static inline void flush_all_mm(struct mm_struct *mm)