[SPARC]: Don't zero out tail during copy_from_user_inatomic().

Actually, since we use the same code for all the copying
types in and out of userspace, we check at runtime whether
preemption is disabled.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/sparc/lib/copy_user.S b/arch/sparc/lib/copy_user.S
index 577505b692ae..ef095b6c43b1 100644
--- a/arch/sparc/lib/copy_user.S
+++ b/arch/sparc/lib/copy_user.S
@@ -14,6 +14,7 @@
 #include <asm/ptrace.h>
 #include <asm/asmmacro.h>
 #include <asm/page.h>
+#include <asm/thread_info.h>
 
 /* Work around cpp -rob */
 #define ALLOC #alloc
@@ -366,6 +367,9 @@ fixupretl:
         blu     1f
          cmp    %o1, %g1
         bgeu    1f
+         ld     [%g6 + TI_PREEMPT], %g1
+        cmp     %g1, 0
+        bne     1f
          nop
         save    %sp, -64, %sp
         mov     %i0, %o0