powerpc/mm: Remove flush_all_mm, local_flush_all_mm

These functions were introduced for "cxl: Enable global TLBIs for cxl
contexts" [1], which ended up using them for Radix only. They were never
implemented on Hash (and creating an implementation appears to be
difficult), so nothing can actually rely on them.

They behave differently to the existing surrounding functions too, in
that they actually need to do something on Hash. The other functions
are primarily for use in generic code that expects their definitions,
but Hash updates the TLB during PTE updates.

After replacing the only usage with the Radix specific version, there
are no more users of these functions, and given they are not implemented
anyway it is safe to delete them.

[1]: https://patchwork.ozlabs.org/project/linuxppc-dev/patch/20170903181513.29635-1-fbarrat@linux.vnet.ibm.com/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/20221109045112.187069-7-bgray@linux.ibm.com

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

@@ -66,28 +66,6 @@ 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_all_mm(struct mm_struct *mm)
-{
-	/*
-	 * There's no Page Walk Cache for hash, so what is needed is
-	 * the same as flush_tlb_mm(), which doesn't really make sense
-	 * with hash. So the only thing we could do is flush the
-	 * entire LPID! Punt for now, as it's not being used.
-	 */
-	WARN_ON_ONCE(1);
-}
-
-static inline void hash__flush_all_mm(struct mm_struct *mm)
-{
-	/*
-	 * There's no Page Walk Cache for hash, so what is needed is
-	 * the same as flush_tlb_mm(), which doesn't really make sense
-	 * with hash. So the only thing we could do is flush the
-	 * entire LPID! Punt for now, as it's not being used.
-	 */
-	WARN_ON_ONCE(1);
-}
-
 struct mmu_gather;
 extern void hash__tlb_flush(struct mmu_gather *tlb);
 

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

@@ -86,13 +86,6 @@ static inline void local_flush_tlb_page(struct vm_area_struct *vma,
 		radix__local_flush_tlb_page(vma, vmaddr);
 }
 
-static inline void local_flush_all_mm(struct mm_struct *mm)
-{
-	if (radix_enabled())
-		return radix__local_flush_all_mm(mm);
-	return hash__local_flush_all_mm(mm);
-}
-
 static inline void tlb_flush(struct mmu_gather *tlb)
 {
 	if (radix_enabled())
@@ -112,17 +105,9 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
 	if (radix_enabled())
 		radix__flush_tlb_page(vma, vmaddr);
 }
-
-static inline void flush_all_mm(struct mm_struct *mm)
-{
-	if (radix_enabled())
-		return radix__flush_all_mm(mm);
-	return hash__flush_all_mm(mm);
-}
 #else
 #define flush_tlb_mm(mm)		local_flush_tlb_mm(mm)
 #define flush_tlb_page(vma, addr)	local_flush_tlb_page(vma, addr)
-#define flush_all_mm(mm)		local_flush_all_mm(mm)
 #endif /* CONFIG_SMP */
 
 #define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault