4 files changed, 12 insertions, 60 deletions

diff --git a/arch/arm/include/asm/tlbflush.h b/arch/arm/include/asm/tlbflush.h
index d2005de383b8..8077145698ff 100644
--- a/arch/arm/include/asm/tlbflush.h
+++ b/arch/arm/include/asm/tlbflush.h
@@ -34,16 +34,12 @@
 #define TLB_V6_D_ASID   (1 << 17)
 #define TLB_V6_I_ASID   (1 << 18)
 
-#define TLB_BTB         (1 << 28)
-
 /* Unified Inner Shareable TLB operations (ARMv7 MP extensions) */
 #define TLB_V7_UIS_PAGE (1 << 19)
 #define TLB_V7_UIS_FULL (1 << 20)
 #define TLB_V7_UIS_ASID (1 << 21)
 
-/* Inner Shareable BTB operation (ARMv7 MP extensions) */
-#define TLB_V7_IS_BTB   (1 << 22)
-
+#define TLB_BARRIER     (1 << 28)
 #define TLB_L2CLEAN_FR  (1 << 29)               /* Feroceon */
 #define TLB_DCLEAN      (1 << 30)
 #define TLB_WB          (1 << 31)
@@ -58,7 +54,7 @@
  *        v4wb  - ARMv4 with write buffer without I TLB flush entry instruction
  *        v4wbi - ARMv4 with write buffer with I TLB flush entry instruction
  *        fr    - Feroceon (v4wbi with non-outer-cacheable page table walks)
- *        fa    - Faraday (v4 with write buffer with UTLB and branch target buffer (BTB))
+ *        fa    - Faraday (v4 with write buffer with UTLB)
  *        v6wbi - ARMv6 with write buffer with I TLB flush entry instruction
  *        v7wbi - identical to v6wbi
  */
@@ -99,7 +95,7 @@
 # define v4_always_flags        (-1UL)
 #endif
 
-#define fa_tlb_flags    (TLB_WB | TLB_BTB | TLB_DCLEAN | \
+#define fa_tlb_flags    (TLB_WB | TLB_DCLEAN | TLB_BARRIER | \
                          TLB_V4_U_FULL | TLB_V4_U_PAGE)
 
 #ifdef CONFIG_CPU_TLB_FA
@@ -166,7 +162,7 @@
 # define v4wb_always_flags      (-1UL)
 #endif
 
-#define v6wbi_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_BTB | \
+#define v6wbi_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_BARRIER | \
                          TLB_V6_I_FULL | TLB_V6_D_FULL | \
                          TLB_V6_I_PAGE | TLB_V6_D_PAGE | \
                          TLB_V6_I_ASID | TLB_V6_D_ASID)
@@ -184,9 +180,9 @@
 # define v6wbi_always_flags     (-1UL)
 #endif
 
-#define v7wbi_tlb_flags_smp     (TLB_WB | TLB_DCLEAN | TLB_V7_IS_BTB | \
+#define v7wbi_tlb_flags_smp     (TLB_WB | TLB_DCLEAN | TLB_BARRIER | \
                          TLB_V7_UIS_FULL | TLB_V7_UIS_PAGE | TLB_V7_UIS_ASID)
-#define v7wbi_tlb_flags_up      (TLB_WB | TLB_DCLEAN | TLB_BTB | \
+#define v7wbi_tlb_flags_up      (TLB_WB | TLB_DCLEAN | TLB_BARRIER | \
                          TLB_V6_U_FULL | TLB_V6_U_PAGE | TLB_V6_U_ASID)
 
 #ifdef CONFIG_CPU_TLB_V7
@@ -341,15 +337,7 @@ static inline void local_flush_tlb_all(void)
         if (tlb_flag(TLB_V7_UIS_FULL))
                 asm("mcr p15, 0, %0, c8, c3, 0" : : "r" (zero) : "cc");
 
-        if (tlb_flag(TLB_BTB)) {
-                /* flush the branch target cache */
-                asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
-                dsb();
-                isb();
-        }
-        if (tlb_flag(TLB_V7_IS_BTB)) {
-                /* flush the branch target cache */
-                asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
+        if (tlb_flag(TLB_BARRIER)) {
                 dsb();
                 isb();
         }
@@ -389,17 +377,8 @@ static inline void local_flush_tlb_mm(struct mm_struct *mm)
                 asm("mcr p15, 0, %0, c8, c3, 2" : : "r" (asid) : "cc");
 #endif
 
-        if (tlb_flag(TLB_BTB)) {
-                /* flush the branch target cache */
-                asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
-                dsb();
-        }
-        if (tlb_flag(TLB_V7_IS_BTB)) {
-                /* flush the branch target cache */
-                asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
+        if (tlb_flag(TLB_BARRIER))
                 dsb();
-                isb();
-        }
 }
 
 static inline void
@@ -439,17 +418,8 @@ local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
                 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (uaddr) : "cc");
 #endif
 
-        if (tlb_flag(TLB_BTB)) {
-                /* flush the branch target cache */
-                asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
-                dsb();
-        }
-        if (tlb_flag(TLB_V7_IS_BTB)) {
-                /* flush the branch target cache */
-                asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
+        if (tlb_flag(TLB_BARRIER))
                 dsb();
-                isb();
-        }
 }
 
 static inline void local_flush_tlb_kernel_page(unsigned long kaddr)
@@ -482,15 +452,7 @@ static inline void local_flush_tlb_kernel_page(unsigned long kaddr)
         if (tlb_flag(TLB_V7_UIS_PAGE))
                 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (kaddr) : "cc");
 
-        if (tlb_flag(TLB_BTB)) {
-                /* flush the branch target cache */
-                asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
-                dsb();
-                isb();
-        }
-        if (tlb_flag(TLB_V7_IS_BTB)) {
-                /* flush the branch target cache */
-                asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
+        if (tlb_flag(TLB_BARRIER)) {
                 dsb();
                 isb();
         }
diff --git a/arch/arm/mm/tlb-fa.S b/arch/arm/mm/tlb-fa.S
index 9694f1f6f485..d887a31faaae 100644
--- a/arch/arm/mm/tlb-fa.S
+++ b/arch/arm/mm/tlb-fa.S
@@ -46,7 +46,6 @@ ENTRY(fa_flush_user_tlb_range)
         add     r0, r0, #PAGE_SZ
         cmp     r0, r1
         blo     1b
-        mcr     p15, 0, r3, c7, c5, 6           @ invalidate BTB
         mcr     p15, 0, r3, c7, c10, 4          @ data write barrier
         mov     pc, lr
 
@@ -60,9 +59,8 @@ ENTRY(fa_flush_kern_tlb_range)
         add     r0, r0, #PAGE_SZ
         cmp     r0, r1
         blo     1b
-        mcr     p15, 0, r3, c7, c5, 6           @ invalidate BTB
         mcr     p15, 0, r3, c7, c10, 4          @ data write barrier
-        mcr     p15, 0, r3, c7, c5, 4           @ prefetch flush
+        mcr     p15, 0, r3, c7, c5, 4           @ prefetch flush (isb)
         mov     pc, lr
 
         __INITDATA
diff --git a/arch/arm/mm/tlb-v6.S b/arch/arm/mm/tlb-v6.S
index 73d7d89b04c4..ffe06a69a6e5 100644
--- a/arch/arm/mm/tlb-v6.S
+++ b/arch/arm/mm/tlb-v6.S
@@ -54,7 +54,6 @@ ENTRY(v6wbi_flush_user_tlb_range)
         add     r0, r0, #PAGE_SZ
         cmp     r0, r1
         blo     1b
-        mcr     p15, 0, ip, c7, c5, 6           @ flush BTAC/BTB
         mcr     p15, 0, ip, c7, c10, 4          @ data synchronization barrier
         mov     pc, lr
 
@@ -83,9 +82,8 @@ ENTRY(v6wbi_flush_kern_tlb_range)
         add     r0, r0, #PAGE_SZ
         cmp     r0, r1
         blo     1b
-        mcr     p15, 0, r2, c7, c5, 6           @ flush BTAC/BTB
         mcr     p15, 0, r2, c7, c10, 4          @ data synchronization barrier
-        mcr     p15, 0, r2, c7, c5, 4           @ prefetch flush
+        mcr     p15, 0, r2, c7, c5, 4           @ prefetch flush (isb)
         mov     pc, lr
 
         __INIT
diff --git a/arch/arm/mm/tlb-v7.S b/arch/arm/mm/tlb-v7.S
index 53cd5b454673..86bb71664508 100644
--- a/arch/arm/mm/tlb-v7.S
+++ b/arch/arm/mm/tlb-v7.S
@@ -48,9 +48,6 @@ ENTRY(v7wbi_flush_user_tlb_range)
         add     r0, r0, #PAGE_SZ
         cmp     r0, r1
         blo     1b
-        mov     ip, #0
-        ALT_SMP(mcr     p15, 0, ip, c7, c1, 6)  @ flush BTAC/BTB Inner Shareable
-        ALT_UP(mcr      p15, 0, ip, c7, c5, 6)  @ flush BTAC/BTB
         dsb
         mov     pc, lr
 ENDPROC(v7wbi_flush_user_tlb_range)
@@ -75,9 +72,6 @@ ENTRY(v7wbi_flush_kern_tlb_range)
         add     r0, r0, #PAGE_SZ
         cmp     r0, r1
         blo     1b
-        mov     r2, #0
-        ALT_SMP(mcr     p15, 0, r2, c7, c1, 6)  @ flush BTAC/BTB Inner Shareable
-        ALT_UP(mcr      p15, 0, r2, c7, c5, 6)  @ flush BTAC/BTB
         dsb
         isb
         mov     pc, lr