[PATCH 06/20] mm, sparc64: Dont use tlb_flush for external tlb flushes

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

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Both sparc64 and powerpc64 use tlb_flush() to flush their respective
hash-tables which is entirely different from what
flush_tlb_range()/flush_tlb_mm() would do.

Powerpc64 already uses arch_*_lazy_mmu_mode() to batch and flush these
so any tlb_flush() caller should already find an empty batch, make
sparc64 do the same.

This ensures all platforms now have a tlb_flush() implementation that
is either flush_tlb_mm() or flush_tlb_range().

Cc: David Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 arch/sparc/Makefile                  |    1 +
 arch/sparc/include/asm/tlb_64.h      |    2 +-
 arch/sparc/include/asm/tlbflush_64.h |   11 +++++++++++
 3 files changed, 13 insertions(+), 1 deletion(-)
--- a/arch/sparc/Makefile
+++ b/arch/sparc/Makefile
@@ -37,6 +37,7 @@ LDFLAGS       := -m elf64_sparc
 export BITS   := 64
 UTS_MACHINE   := sparc64
 
+KBUILD_CPPFLAGS += -D__HAVE_ARCH_ENTER_LAZY_MMU_MODE
 KBUILD_CFLAGS += -m64 -pipe -mno-fpu -mcpu=ultrasparc -mcmodel=medlow
 KBUILD_CFLAGS += -ffixed-g4 -ffixed-g5 -fcall-used-g7 -Wno-sign-compare
 KBUILD_CFLAGS += -Wa,--undeclared-regs
--- a/arch/sparc/include/asm/tlb_64.h
+++ b/arch/sparc/include/asm/tlb_64.h
@@ -25,7 +25,7 @@ extern void flush_tlb_pending(void);
 #define tlb_start_vma(tlb, vma) do { } while (0)
 #define tlb_end_vma(tlb, vma)	do { } while (0)
 #define __tlb_remove_tlb_entry(tlb, ptep, address) do { } while (0)
-#define tlb_flush(tlb)	flush_tlb_pending()
+#define tlb_flush(tlb)	do { } while (0)
 
 #include <asm-generic/tlb.h>
 
--- a/arch/sparc/include/asm/tlbflush_64.h
+++ b/arch/sparc/include/asm/tlbflush_64.h
@@ -26,6 +26,17 @@ extern void flush_tlb_pending(void);
 #define flush_tlb_page(vma,addr)	flush_tlb_pending()
 #define flush_tlb_mm(mm)		flush_tlb_pending()
 
+static inline void arch_enter_lazy_mmu_mode(void)
+{
+}
+
+static inline void arch_leave_lazy_mmu_mode(void)
+{
+	flush_tlb_pending();
+}
+
+#define arch_flush_lazy_mmu_mode()      do {} while (0)
+
 /* Local cpu only.  */
 extern void __flush_tlb_all(void);
 


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