3 files changed, 55 insertions, 22 deletions

diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 2ad4aa2a1536..55076a75e5bf 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -131,7 +131,7 @@ __syscall_start:
                 .long   sys_wait4
 /* 115 */       .long   sys_swapoff
                 .long   sys_sysinfo
-                .long   sys_ipc_wrapper
+                .long   sys_ipc
                 .long   sys_fsync
                 .long   sys_sigreturn_wrapper
 /* 120 */       .long   sys_clone_wrapper
@@ -254,7 +254,7 @@ __syscall_start:
                 .long   sys_fremovexattr
                 .long   sys_tkill
                 .long   sys_sendfile64
-/* 240 */       .long   sys_futex_wrapper
+/* 240 */       .long   sys_futex
                 .long   sys_sched_setaffinity
                 .long   sys_sched_getaffinity
                 .long   sys_io_setup
@@ -284,7 +284,7 @@ __syscall_start:
                 .long   sys_fstatfs64
                 .long   sys_tgkill
                 .long   sys_utimes
-/* 270 */       .long   sys_arm_fadvise64_64_wrapper
+/* 270 */       .long   sys_arm_fadvise64_64
                 .long   sys_pciconfig_iobase
                 .long   sys_pciconfig_read
                 .long   sys_pciconfig_write
@@ -333,7 +333,7 @@ __syscall_start:
                 .long   sys_inotify_init
                 .long   sys_inotify_add_watch
                 .long   sys_inotify_rm_watch
-                .long   sys_mbind_wrapper
+                .long   sys_mbind
 /* 320 */       .long   sys_get_mempolicy
                 .long   sys_set_mempolicy
 __syscall_end:
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index d9fb819bf7cc..2a8d27e18fa7 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -614,6 +614,47 @@ __kuser_helper_start:
 /*
  * Reference prototype:
  *
+ *      void __kernel_memory_barrier(void)
+ *
+ * Input:
+ *
+ *      lr = return address
+ *
+ * Output:
+ *
+ *      none
+ *
+ * Clobbered:
+ *
+ *      the Z flag might be lost
+ *
+ * Definition and user space usage example:
+ *
+ *      typedef void (__kernel_dmb_t)(void);
+ *      #define __kernel_dmb (*(__kernel_dmb_t *)0xffff0fa0)
+ *
+ * Apply any needed memory barrier to preserve consistency with data modified
+ * manually and __kuser_cmpxchg usage.
+ *
+ * This could be used as follows:
+ *
+ * #define __kernel_dmb() \
+ *         asm volatile ( "mov r0, #0xffff0fff; mov lr, pc; sub pc, r0, #95" \
+ *              : : : "lr","cc" )
+ */
+
+__kuser_memory_barrier:                         @ 0xffff0fa0
+
+#if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_SMP)
+        mcr     p15, 0, r0, c7, c10, 5  @ dmb
+#endif
+        mov     pc, lr
+
+        .align  5
+
+/*
+ * Reference prototype:
+ *
  *      int __kernel_cmpxchg(int oldval, int newval, int *ptr)
  *
  * Input:
@@ -642,6 +683,8 @@ __kuser_helper_start:
  * The C flag is also set if *ptr was changed to allow for assembly
  * optimization in the calling code.
  *
+ * Note: this routine already includes memory barriers as needed.
+ *
  * For example, a user space atomic_add implementation could look like this:
  *
  * #define atomic_add(ptr, val) \
@@ -698,10 +741,16 @@ __kuser_cmpxchg:				@ 0xffff0fc0
 
 #else
 
+#ifdef CONFIG_SMP
+        mcr     p15, 0, r0, c7, c10, 5  @ dmb
+#endif
         ldrex   r3, [r2]
         subs    r3, r3, r0
         strexeq r3, r1, [r2]
         rsbs    r0, r3, #0
+#ifdef CONFIG_SMP
+        mcr     p15, 0, r0, c7, c10, 5  @ dmb
+#endif
         mov     pc, lr
 
 #endif
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index f7f183075237..e2b42997ad33 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -145,7 +145,7 @@ ENTRY(vector_swi)
 #endif
         enable_irq
 
-        str     r4, [sp, #-S_OFF]!              @ push fifth arg
+        stmdb   sp!, {r4, r5}                   @ push fifth and sixth args
 
         get_thread_info tsk
         ldr     ip, [tsk, #TI_FLAGS]            @ check for syscall tracing
@@ -204,7 +204,7 @@ ENTRY(sys_call_table)
  * Special system call wrappers
  */
 @ r0 = syscall number
-@ r5 = syscall table
+@ r8 = syscall table
                 .type   sys_syscall, #function
 sys_syscall:
                 eor     scno, r0, #__NR_SYSCALL_BASE
@@ -255,22 +255,6 @@ sys_sigaltstack_wrapper:
                 ldr     r2, [sp, #S_OFF + S_SP]
                 b       do_sigaltstack
 
-sys_futex_wrapper:
-                str     r5, [sp, #4]            @ push sixth arg
-                b       sys_futex
-
-sys_arm_fadvise64_64_wrapper:
-                str     r5, [sp, #4]            @ push r5 to stack
-                b       sys_arm_fadvise64_64
-
-sys_mbind_wrapper:
-                str     r5, [sp, #4]
-                b       sys_mbind
-
-sys_ipc_wrapper:
-                str     r5, [sp, #4]            @ push sixth arg
-                b       sys_ipc
-
 /*
  * Note: off_4k (r5) is always units of 4K.  If we can't do the requested
  * offset, we return EINVAL.