asm-generic/tlb: Remove CONFIG_HAVE_GENERIC_MMU_GATHER

Since all architectures are now using it, it is redundant.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/asm-generic/tlb.h

@@ -146,7 +146,6 @@
  *
  *  Use this if your architecture lacks an efficient flush_tlb_range().
  */
-#define HAVE_GENERIC_MMU_GATHER
 
 #ifdef CONFIG_HAVE_RCU_TABLE_FREE
 /*

mm/mmu_gather.c

@@ -11,8 +11,6 @@
 #include <asm/pgalloc.h>
 #include <asm/tlb.h>
 
-#ifdef HAVE_GENERIC_MMU_GATHER
-
 #ifndef CONFIG_HAVE_MMU_GATHER_NO_GATHER
 
 static bool tlb_next_batch(struct mmu_gather *tlb)
@@ -109,8 +107,6 @@ void tlb_flush_mmu(struct mmu_gather *tlb)
 	tlb_flush_mmu_free(tlb);
 }
 
-#endif /* HAVE_GENERIC_MMU_GATHER */
-
 #ifdef CONFIG_HAVE_RCU_TABLE_FREE
 
 /*